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[rt] Update to 4.4-rt3 

This includes all the build fixes I made for 4.4-rt1 and -rt2, so drop
my patches.
This commit is contained in:
Ben Hutchings 2016-01-27 19:24:32 +00:00
parent 3106c3977c
commit 546ce38280
271 changed files with 1690 additions and 759 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
debian/changelog vendored
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@ -20,6 +20,7 @@ linux (4.4-1~exp2) UNRELEASED; urgency=medium
* linux-image: Remove unnecessary debconf initialisations
* linux-{headers,image}: Remove support for version-specific hooks
* linux-headers: Make postinst script less verbose (see: #734266)
* [rt] Update to 4.4-rt3
-- Ian Campbell <ijc@debian.org> Sat, 23 Jan 2016 08:23:05 +0000

2
debian/patches/features/all/rt/0005-futex-Ensure-lock-unlock-symetry-versus-pi_lock-and-.patch vendored
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@ -1,7 +1,7 @@
From: Thomas Gleixner <tglx@linutronix.de>
Date: Fri, 1 Mar 2013 11:17:42 +0100
Subject: futex: Ensure lock/unlock symetry versus pi_lock and hash bucket lock
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
In exit_pi_state_list() we have the following locking construct:

178
debian/patches/features/all/rt/0009-ARM-OMAP2-Drop-the-concept-of-certain-power-domains-.patch vendored
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@ -1,178 +0,0 @@
From 70f4293bd36740fd730ab25abe39281d1b312365 Mon Sep 17 00:00:00 2001
From: Russ Dill <Russ.Dill@ti.com>
Date: Wed, 5 Aug 2015 15:30:44 +0530
Subject: [PATCH 09/21] ARM: OMAP2: Drop the concept of certain power domains
not being able to lose context.
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
It isn't much of a win, and with hibernation, everything loses context.
Signed-off-by: Russ Dill <Russ.Dill@ti.com>
[j-keerthy@ti.com] ported to 4.1
Signed-off-by: Keerthy <j-keerthy@ti.com>
---
arch/arm/mach-omap2/gpio.c | 1
arch/arm/mach-omap2/powerdomain.c | 40 --------------------------------
arch/arm/mach-omap2/powerdomain.h | 1
drivers/gpio/gpio-omap.c | 36 +++++++++++-----------------
include/linux/platform_data/gpio-omap.h | 1
5 files changed, 14 insertions(+), 65 deletions(-)
--- a/arch/arm/mach-omap2/gpio.c
+++ b/arch/arm/mach-omap2/gpio.c
@@ -130,7 +130,6 @@ static int __init omap2_gpio_dev_init(st
}
pwrdm = omap_hwmod_get_pwrdm(oh);
- pdata->loses_context = pwrdm_can_ever_lose_context(pwrdm);
pdev = omap_device_build(name, id - 1, oh, pdata, sizeof(*pdata));
kfree(pdata);
--- a/arch/arm/mach-omap2/powerdomain.c
+++ b/arch/arm/mach-omap2/powerdomain.c
@@ -1166,43 +1166,3 @@ int pwrdm_get_context_loss_count(struct
return count;
}
-/**
- * pwrdm_can_ever_lose_context - can this powerdomain ever lose context?
- * @pwrdm: struct powerdomain *
- *
- * Given a struct powerdomain * @pwrdm, returns 1 if the powerdomain
- * can lose either memory or logic context or if @pwrdm is invalid, or
- * returns 0 otherwise. This function is not concerned with how the
- * powerdomain registers are programmed (i.e., to go off or not); it's
- * concerned with whether it's ever possible for this powerdomain to
- * go off while some other part of the chip is active. This function
- * assumes that every powerdomain can go to either ON or INACTIVE.
- */
-bool pwrdm_can_ever_lose_context(struct powerdomain *pwrdm)
-{
- int i;
-
- if (!pwrdm) {
- pr_debug("powerdomain: %s: invalid powerdomain pointer\n",
- __func__);
- return 1;
- }
-
- if (pwrdm->pwrsts & PWRSTS_OFF)
- return 1;
-
- if (pwrdm->pwrsts & PWRSTS_RET) {
- if (pwrdm->pwrsts_logic_ret & PWRSTS_OFF)
- return 1;
-
- for (i = 0; i < pwrdm->banks; i++)
- if (pwrdm->pwrsts_mem_ret[i] & PWRSTS_OFF)
- return 1;
- }
-
- for (i = 0; i < pwrdm->banks; i++)
- if (pwrdm->pwrsts_mem_on[i] & PWRSTS_OFF)
- return 1;
-
- return 0;
-}
--- a/arch/arm/mach-omap2/powerdomain.h
+++ b/arch/arm/mach-omap2/powerdomain.h
@@ -244,7 +244,6 @@ int pwrdm_state_switch(struct powerdomai
int pwrdm_pre_transition(struct powerdomain *pwrdm);
int pwrdm_post_transition(struct powerdomain *pwrdm);
int pwrdm_get_context_loss_count(struct powerdomain *pwrdm);
-bool pwrdm_can_ever_lose_context(struct powerdomain *pwrdm);
extern int omap_set_pwrdm_state(struct powerdomain *pwrdm, u8 state);
--- a/drivers/gpio/gpio-omap.c
+++ b/drivers/gpio/gpio-omap.c
@@ -69,7 +69,7 @@ struct gpio_bank {
struct device *dev;
bool is_mpuio;
bool dbck_flag;
- bool loses_context;
+
bool context_valid;
int stride;
u32 width;
@@ -1208,15 +1208,9 @@ static int omap_gpio_probe(struct platfo
#ifdef CONFIG_OF_GPIO
bank->chip.of_node = of_node_get(node);
#endif
- if (node) {
- if (!of_property_read_bool(node, "ti,gpio-always-on"))
- bank->loses_context = true;
- } else {
- bank->loses_context = pdata->loses_context;
-
- if (bank->loses_context)
- bank->get_context_loss_count =
- pdata->get_context_loss_count;
+ if (!node) {
+ bank->get_context_loss_count =
+ pdata->get_context_loss_count;
}
if (bank->regs->set_dataout && bank->regs->clr_dataout)
@@ -1373,7 +1367,7 @@ static int omap_gpio_runtime_resume(stru
* been initialised and so initialise it now. Also initialise
* the context loss count.
*/
- if (bank->loses_context && !bank->context_valid) {
+ if (!bank->context_valid) {
omap_gpio_init_context(bank);
if (bank->get_context_loss_count)
@@ -1394,17 +1388,15 @@ static int omap_gpio_runtime_resume(stru
writel_relaxed(bank->context.risingdetect,
bank->base + bank->regs->risingdetect);
- if (bank->loses_context) {
- if (!bank->get_context_loss_count) {
+ if (!bank->get_context_loss_count) {
+ omap_gpio_restore_context(bank);
+ } else {
+ c = bank->get_context_loss_count(bank->dev);
+ if (c != bank->context_loss_count) {
omap_gpio_restore_context(bank);
} else {
- c = bank->get_context_loss_count(bank->dev);
- if (c != bank->context_loss_count) {
- omap_gpio_restore_context(bank);
- } else {
- raw_spin_unlock_irqrestore(&bank->lock, flags);
- return 0;
- }
+ spin_unlock_irqrestore(&bank->lock, flags);
+ return 0;
}
}
@@ -1476,7 +1468,7 @@ void omap2_gpio_prepare_for_idle(int pwr
struct gpio_bank *bank;
list_for_each_entry(bank, &omap_gpio_list, node) {
- if (!BANK_USED(bank) || !bank->loses_context)
+ if (!BANK_USED(bank))
continue;
bank->power_mode = pwr_mode;
@@ -1490,7 +1482,7 @@ void omap2_gpio_resume_after_idle(void)
struct gpio_bank *bank;
list_for_each_entry(bank, &omap_gpio_list, node) {
- if (!BANK_USED(bank) || !bank->loses_context)
+ if (!BANK_USED(bank))
continue;
pm_runtime_get_sync(bank->dev);
--- a/include/linux/platform_data/gpio-omap.h
+++ b/include/linux/platform_data/gpio-omap.h
@@ -198,7 +198,6 @@ struct omap_gpio_platform_data {
int bank_width; /* GPIO bank width */
int bank_stride; /* Only needed for omap1 MPUIO */
bool dbck_flag; /* dbck required or not - True for OMAP3&4 */
- bool loses_context; /* whether the bank would ever lose context */
bool is_mpuio; /* whether the bank is of type MPUIO */
u32 non_wakeup_gpios;

2
debian/patches/features/all/rt/ARM-enable-irq-in-translation-section-permission-fau.patch vendored
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@ -1,7 +1,7 @@
From: "Yadi.hu" <yadi.hu@windriver.com>
Date: Wed, 10 Dec 2014 10:32:09 +0800
Subject: ARM: enable irq in translation/section permission fault handlers
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Probably happens on all ARM, with
CONFIG_PREEMPT_RT_FULL

2
debian/patches/features/all/rt/HACK-printk-drop-the-logbuf_lock-more-often.patch vendored
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@ -1,7 +1,7 @@
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Thu, 21 Mar 2013 19:01:05 +0100
Subject: printk: Drop the logbuf_lock more often
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
The lock is hold with irgs off. The latency drops 500us+ on my arm bugs
with a "full" buffer after executing "dmesg" on the shell.

2
debian/patches/features/all/rt/KVM-lapic-mark-LAPIC-timer-handler-as-irqsafe.patch vendored
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@ -1,7 +1,7 @@
From: Marcelo Tosatti <mtosatti@redhat.com>
Date: Wed, 8 Apr 2015 20:33:25 -0300
Subject: KVM: lapic: mark LAPIC timer handler as irqsafe
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Since lapic timer handler only wakes up a simple waitqueue,
it can be executed from hardirq context.

2
debian/patches/features/all/rt/KVM-use-simple-waitqueue-for-vcpu-wq.patch vendored
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@ -1,7 +1,7 @@
From: Marcelo Tosatti <mtosatti@redhat.com>
Date: Wed, 8 Apr 2015 20:33:24 -0300
Subject: KVM: use simple waitqueue for vcpu->wq
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
The problem:

2
debian/patches/features/all/rt/acpi-rt-Convert-acpi_gbl_hardware-lock-back-to-a-raw.patch vendored
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@ -1,7 +1,7 @@
From: Steven Rostedt <rostedt@goodmis.org>
Date: Wed, 13 Feb 2013 09:26:05 -0500
Subject: acpi/rt: Convert acpi_gbl_hardware lock back to a raw_spinlock_t
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
We hit the following bug with 3.6-rt:

2
debian/patches/features/all/rt/arch-arm64-Add-lazy-preempt-support.patch vendored
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@ -1,7 +1,7 @@
From: Anders Roxell <anders.roxell@linaro.org>
Date: Thu, 14 May 2015 17:52:17 +0200
Subject: arch/arm64: Add lazy preempt support
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
arm64 is missing support for PREEMPT_RT. The main feature which is
lacking is support for lazy preemption. The arch-specific entry code,

77
debian/patches/features/all/rt/arm-arm64-lazy-preempt-add-TIF_NEED_RESCHED_LAZY-to-.patch vendored Normal file
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@ -0,0 +1,77 @@
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Fri, 22 Jan 2016 21:33:39 +0100
Subject: arm+arm64: lazy-preempt: add TIF_NEED_RESCHED_LAZY to _TIF_WORK_MASK
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
_TIF_WORK_MASK is used to check for TIF_NEED_RESCHED so we need to check
for TIF_NEED_RESCHED_LAZY here, too.
Reported-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
arch/arm/include/asm/thread_info.h | 7 ++++---
arch/arm/kernel/entry-common.S | 9 +++++++--
arch/arm64/include/asm/thread_info.h | 3 ++-
3 files changed, 13 insertions(+), 6 deletions(-)
--- a/arch/arm/include/asm/thread_info.h
+++ b/arch/arm/include/asm/thread_info.h
@@ -143,8 +143,8 @@ extern int vfp_restore_user_hwstate(stru
#define TIF_SYSCALL_TRACE 4 /* syscall trace active */
#define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */
#define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */
-#define TIF_SECCOMP 7 /* seccomp syscall filtering active */
-#define TIF_NEED_RESCHED_LAZY 8
+#define TIF_SECCOMP 8 /* seccomp syscall filtering active */
+#define TIF_NEED_RESCHED_LAZY 7
#define TIF_NOHZ 12 /* in adaptive nohz mode */
#define TIF_USING_IWMMXT 17
@@ -170,7 +170,8 @@ extern int vfp_restore_user_hwstate(stru
* Change these and you break ASM code in entry-common.S
*/
#define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
- _TIF_NOTIFY_RESUME | _TIF_UPROBE)
+ _TIF_NOTIFY_RESUME | _TIF_UPROBE | \
+ _TIF_NEED_RESCHED_LAZY)
#endif /* __KERNEL__ */
#endif /* __ASM_ARM_THREAD_INFO_H */
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -36,7 +36,9 @@
UNWIND(.cantunwind )
disable_irq_notrace @ disable interrupts
ldr r1, [tsk, #TI_FLAGS] @ re-check for syscall tracing
- tst r1, #_TIF_SYSCALL_WORK | _TIF_WORK_MASK
+ tst r1, #((_TIF_SYSCALL_WORK | _TIF_WORK_MASK) & ~_TIF_SECCOMP)
+ bne fast_work_pending
+ tst r1, #_TIF_SECCOMP
bne fast_work_pending
/* perform architecture specific actions before user return */
@@ -62,8 +64,11 @@ ENDPROC(ret_fast_syscall)
str r0, [sp, #S_R0 + S_OFF]! @ save returned r0
disable_irq_notrace @ disable interrupts
ldr r1, [tsk, #TI_FLAGS] @ re-check for syscall tracing
- tst r1, #_TIF_SYSCALL_WORK | _TIF_WORK_MASK
+ tst r1, #((_TIF_SYSCALL_WORK | _TIF_WORK_MASK) & ~_TIF_SECCOMP)
+ bne do_slower_path
+ tst r1, #_TIF_SECCOMP
beq no_work_pending
+do_slower_path:
UNWIND(.fnend )
ENDPROC(ret_fast_syscall)
--- a/arch/arm64/include/asm/thread_info.h
+++ b/arch/arm64/include/asm/thread_info.h
@@ -129,7 +129,8 @@ static inline struct thread_info *curren
#define _TIF_32BIT (1 << TIF_32BIT)
#define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
- _TIF_NOTIFY_RESUME | _TIF_FOREIGN_FPSTATE)
+ _TIF_NOTIFY_RESUME | _TIF_FOREIGN_FPSTATE | \
+ _TIF_NEED_RESCHED_LAZY)
#define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
_TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP | \

37
debian/patches/features/all/rt/arm-at91-pit-remove-irq-handler-when-clock-is-unused.patch vendored
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@ -1,7 +1,7 @@
From: Benedikt Spranger <b.spranger@linutronix.de>
Date: Sat, 6 Mar 2010 17:47:10 +0100
Subject: ARM: AT91: PIT: Remove irq handler when clock event is unused
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Setup and remove the interrupt handler in clock event mode selection.
This avoids calling the (shared) interrupt handler when the device is
@ -14,21 +14,24 @@ commit 8fe82a55 ("ARM: at91: sparse irq support") which is included since v3.6.
Patch based on what Sami Pietikäinen <Sami.Pietikainen@wapice.com> suggested].
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
drivers/clocksource/timer-atmel-pit.c | 15 ++++++++-------
drivers/clocksource/timer-atmel-st.c | 28 ++++++++++++++++++++--------
2 files changed, 28 insertions(+), 15 deletions(-)
drivers/clocksource/timer-atmel-pit.c | 17 +++++++++--------
drivers/clocksource/timer-atmel-st.c | 32 ++++++++++++++++++++++----------
2 files changed, 31 insertions(+), 18 deletions(-)
--- a/drivers/clocksource/timer-atmel-pit.c
+++ b/drivers/clocksource/timer-atmel-pit.c
@@ -96,6 +96,7 @@ static int pit_clkevt_shutdown(struct cl
@@ -96,15 +96,24 @@ static int pit_clkevt_shutdown(struct cl
/* disable irq, leaving the clocksource active */
pit_write(data->base, AT91_PIT_MR, (data->cycle - 1) | AT91_PIT_PITEN);
+ free_irq(atmel_pit_irq, data);
+ free_irq(data->irq, data);
return 0;
}
@@ -105,6 +106,13 @@ static int pit_clkevt_shutdown(struct cl
+static irqreturn_t at91sam926x_pit_interrupt(int irq, void *dev_id);
/*
* Clockevent device: interrupts every 1/HZ (== pit_cycles * MCK/16)
*/
static int pit_clkevt_set_periodic(struct clock_event_device *dev)
{
struct pit_data *data = clkevt_to_pit_data(dev);
@ -42,6 +45,14 @@ Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
/* update clocksource counter */
data->cnt += data->cycle * PIT_PICNT(pit_read(data->base, AT91_PIT_PIVR));
@@ -181,7 +190,6 @@ static void __init at91sam926x_pit_commo
{
unsigned long pit_rate;
unsigned bits;
- int ret;
/*
* Use our actual MCK to figure out how many MCK/16 ticks per
@@ -206,13 +214,6 @@ static void __init at91sam926x_pit_commo
data->clksrc.flags = CLOCK_SOURCE_IS_CONTINUOUS;
clocksource_register_hz(&data->clksrc, pit_rate);
@ -92,7 +103,7 @@ Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
static int clkevt32k_set_periodic(struct clock_event_device *dev)
{
+ int irq;
+ int ret;
+
clkdev32k_disable_and_flush_irq();
@ -114,8 +125,14 @@ Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
regmap_st = syscon_node_to_regmap(node);
if (IS_ERR(regmap_st))
@@ -214,13 +233,6 @@ static void __init atmel_st_timer_init(s
if (!irq)
@@ -210,17 +229,10 @@ static void __init atmel_st_timer_init(s
regmap_read(regmap_st, AT91_ST_SR, &val);
/* Get the interrupts property */
- irq = irq_of_parse_and_map(node, 0);
- if (!irq)
+ atmel_st_irq = irq_of_parse_and_map(node, 0);
+ if (!atmel_st_irq)
panic(pr_fmt("Unable to get IRQ from DT\n"));
- /* Make IRQs happen for the system timer */

2
debian/patches/features/all/rt/arm-at91-tclib-default-to-tclib-timer-for-rt.patch vendored
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@ -1,7 +1,7 @@
From: Thomas Gleixner <tglx@linutronix.de>
Date: Sat, 1 May 2010 18:29:35 +0200
Subject: ARM: at91: tclib: Default to tclib timer for RT
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
RT is not too happy about the shared timer interrupt in AT91
devices. Default to tclib timer for RT.

2
debian/patches/features/all/rt/arm-convert-boot-lock-to-raw.patch vendored
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@ -1,7 +1,7 @@
From: Frank Rowand <frank.rowand@am.sony.com>
Date: Mon, 19 Sep 2011 14:51:14 -0700
Subject: arm: Convert arm boot_lock to raw
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
The arm boot_lock is used by the secondary processor startup code. The locking
task is the idle thread, which has idle->sched_class == &idle_sched_class.

52
debian/patches/features/all/rt/arm-enable-highmem-for-rt.patch vendored
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@ -1,16 +1,16 @@
Subject: arm: Enable highmem for rt
From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 13 Feb 2013 11:03:11 +0100
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
fixup highmem for ARM.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
arch/arm/include/asm/switch_to.h | 8 ++++++
arch/arm/mm/highmem.c | 45 ++++++++++++++++++++++++++++++++++-----
arch/arm/include/asm/switch_to.h | 8 +++++
arch/arm/mm/highmem.c | 56 +++++++++++++++++++++++++++++++++------
include/linux/highmem.h | 1
3 files changed, 49 insertions(+), 5 deletions(-)
3 files changed, 57 insertions(+), 8 deletions(-)
--- a/arch/arm/include/asm/switch_to.h
+++ b/arch/arm/include/asm/switch_to.h
@ -38,7 +38,19 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
--- a/arch/arm/mm/highmem.c
+++ b/arch/arm/mm/highmem.c
@@ -54,12 +54,13 @@ EXPORT_SYMBOL(kunmap);
@@ -34,6 +34,11 @@ static inline pte_t get_fixmap_pte(unsig
return *ptep;
}
+static unsigned int fixmap_idx(int type)
+{
+ return FIX_KMAP_BEGIN + type + KM_TYPE_NR * smp_processor_id();
+}
+
void *kmap(struct page *page)
{
might_sleep();
@@ -54,12 +59,13 @@ EXPORT_SYMBOL(kunmap);
void *kmap_atomic(struct page *page)
{
@ -53,7 +65,16 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
pagefault_disable();
if (!PageHighMem(page))
return page_address(page);
@@ -93,7 +94,10 @@ void *kmap_atomic(struct page *page)
@@ -79,7 +85,7 @@ void *kmap_atomic(struct page *page)
type = kmap_atomic_idx_push();
- idx = FIX_KMAP_BEGIN + type + KM_TYPE_NR * smp_processor_id();
+ idx = fixmap_idx(type);
vaddr = __fix_to_virt(idx);
#ifdef CONFIG_DEBUG_HIGHMEM
/*
@@ -93,7 +99,10 @@ void *kmap_atomic(struct page *page)
* in place, so the contained TLB flush ensures the TLB is updated
* with the new mapping.
*/
@ -65,7 +86,12 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
return (void *)vaddr;
}
@@ -110,6 +114,9 @@ void __kunmap_atomic(void *kvaddr)
@@ -106,10 +115,13 @@ void __kunmap_atomic(void *kvaddr)
if (kvaddr >= (void *)FIXADDR_START) {
type = kmap_atomic_idx();
- idx = FIX_KMAP_BEGIN + type + KM_TYPE_NR * smp_processor_id();
+ idx = fixmap_idx(type);
if (cache_is_vivt())
__cpuc_flush_dcache_area((void *)vaddr, PAGE_SIZE);
@ -75,7 +101,7 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
#ifdef CONFIG_DEBUG_HIGHMEM
BUG_ON(vaddr != __fix_to_virt(idx));
#else
@@ -122,17 +129,18 @@ void __kunmap_atomic(void *kvaddr)
@@ -122,28 +134,56 @@ void __kunmap_atomic(void *kvaddr)
kunmap_high(pte_page(pkmap_page_table[PKMAP_NR(vaddr)]));
}
pagefault_enable();
@ -96,7 +122,11 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
pagefault_disable();
if (!PageHighMem(page))
return page_address(page);
@@ -143,7 +151,34 @@ void *kmap_atomic_pfn(unsigned long pfn)
type = kmap_atomic_idx_push();
- idx = FIX_KMAP_BEGIN + type + KM_TYPE_NR * smp_processor_id();
+ idx = fixmap_idx(type);
vaddr = __fix_to_virt(idx);
#ifdef CONFIG_DEBUG_HIGHMEM
BUG_ON(!pte_none(get_fixmap_pte(vaddr)));
#endif
@ -117,7 +147,7 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
+ * Clear @prev's kmap_atomic mappings
+ */
+ for (i = 0; i < prev_p->kmap_idx; i++) {
+ int idx = i + KM_TYPE_NR * smp_processor_id();
+ int idx = fixmap_idx(i);
+
+ set_fixmap_pte(idx, __pte(0));
+ }
@ -125,7 +155,7 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
+ * Restore @next_p's kmap_atomic mappings
+ */
+ for (i = 0; i < next_p->kmap_idx; i++) {
+ int idx = i + KM_TYPE_NR * smp_processor_id();
+ int idx = fixmap_idx(i);
+
+ if (!pte_none(next_p->kmap_pte[i]))
+ set_fixmap_pte(idx, next_p->kmap_pte[i]);

2
debian/patches/features/all/rt/arm-highmem-flush-tlb-on-unmap.patch vendored
View File

@ -1,7 +1,7 @@
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Mon, 11 Mar 2013 21:37:27 +0100
Subject: arm/highmem: Flush tlb on unmap
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
The tlb should be flushed on unmap and thus make the mapping entry
invalid. This is only done in the non-debug case which does not look

2
debian/patches/features/all/rt/arm-preempt-lazy-support.patch vendored
View File

@ -1,7 +1,7 @@
Subject: arm: Add support for lazy preemption
From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 31 Oct 2012 12:04:11 +0100
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Implement the arm pieces for lazy preempt.

2
debian/patches/features/all/rt/arm-unwind-use_raw_lock.patch vendored
View File

@ -1,7 +1,7 @@
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Fri, 20 Sep 2013 14:31:54 +0200
Subject: arm/unwind: use a raw_spin_lock
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Mostly unwind is done with irqs enabled however SLUB may call it with
irqs disabled while creating a new SLUB cache.

2
debian/patches/features/all/rt/arm64-xen--Make-XEN-depend-on-non-rt.patch vendored
View File

@ -1,7 +1,7 @@
Subject: arm64/xen: Make XEN depend on !RT
From: Thomas Gleixner <tglx@linutronix.de>
Date: Mon, 12 Oct 2015 11:18:40 +0200
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
It's not ready and probably never will be, unless xen folks have a
look at it.

2
debian/patches/features/all/rt/ata-disable-interrupts-if-non-rt.patch vendored
View File

@ -1,7 +1,7 @@
From: Steven Rostedt <srostedt@redhat.com>
Date: Fri, 3 Jul 2009 08:44:29 -0500
Subject: ata: Do not disable interrupts in ide code for preempt-rt
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Use the local_irq_*_nort variants.

2
debian/patches/features/all/rt/blk-mq-revert-raw-locks-post-pone-notifier-to-POST_D.patchto-POST_D.patch vendored
View File

@ -1,7 +1,7 @@
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat, 3 May 2014 11:00:29 +0200
Subject: blk-mq: revert raw locks, post pone notifier to POST_DEAD
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
The blk_mq_cpu_notify_lock should be raw because some CPU down levels
are called with interrupts off. The notifier itself calls currently one

2
debian/patches/features/all/rt/block-blk-mq-use-swait.patch vendored
View File

@ -1,7 +1,7 @@
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Fri, 13 Feb 2015 11:01:26 +0100
Subject: block: blk-mq: Use swait
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
| BUG: sleeping function called from invalid context at kernel/locking/rtmutex.c:914
| in_atomic(): 1, irqs_disabled(): 0, pid: 255, name: kworker/u257:6

2
debian/patches/features/all/rt/block-mq-don-t-complete-requests-via-IPI.patch vendored
View File

@ -1,7 +1,7 @@
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Thu, 29 Jan 2015 15:10:08 +0100
Subject: block/mq: don't complete requests via IPI
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
The IPI runs in hardirq context and there are sleeping locks. This patch
moves the completion into a workqueue.

2
debian/patches/features/all/rt/block-mq-drop-per-ctx-cpu_lock.patch vendored
View File

@ -1,7 +1,7 @@
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Wed, 18 Feb 2015 18:37:26 +0100
Subject: block/mq: drop per ctx cpu_lock
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
While converting the get_cpu() to get_cpu_light() I added a cpu lock to
ensure the same code is not invoked twice on the same CPU. And now I run

2
debian/patches/features/all/rt/block-mq-drop-preempt-disable.patch vendored
View File

@ -1,7 +1,7 @@
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Tue, 14 Jul 2015 14:26:34 +0200
Subject: block/mq: do not invoke preempt_disable()
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
preempt_disable() and get_cpu() don't play well together with the sleeping
locks it tries to allocate later.

2
debian/patches/features/all/rt/block-mq-use-cpu_light.patch vendored
View File

@ -1,7 +1,7 @@
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Wed, 9 Apr 2014 10:37:23 +0200
Subject: block: mq: use cpu_light()
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
there is a might sleep splat because get_cpu() disables preemption and
later we grab a lock. As a workaround for this we use get_cpu_light()

2
debian/patches/features/all/rt/block-shorten-interrupt-disabled-regions.patch vendored
View File

@ -1,7 +1,7 @@
Subject: block: Shorten interrupt disabled regions
From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 22 Jun 2011 19:47:02 +0200
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Moving the blk_sched_flush_plug() call out of the interrupt/preempt
disabled region in the scheduler allows us to replace

2
debian/patches/features/all/rt/block-use-cpu-chill.patch vendored
View File

@ -1,7 +1,7 @@
Subject: block: Use cpu_chill() for retry loops
From: Thomas Gleixner <tglx@linutronix.de>
Date: Thu, 20 Dec 2012 18:28:26 +0100
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Retry loops on RT might loop forever when the modifying side was
preempted. Steven also observed a live lock when there was a

37
debian/patches/features/all/rt/btrfs-initialize-the-seq-counter-in-struct-btrfs_dev.patch vendored Normal file
View File

@ -0,0 +1,37 @@
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Fri, 15 Jan 2016 14:28:39 +0100
Subject: btrfs: initialize the seq counter in struct btrfs_device
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
I managed to trigger this:
| INFO: trying to register non-static key.
| the code is fine but needs lockdep annotation.
| turning off the locking correctness validator.
| CPU: 1 PID: 781 Comm: systemd-gpt-aut Not tainted 4.4.0-rt2+ #14
| Hardware name: ARM-Versatile Express
| [<80307cec>] (dump_stack)
| [<80070e98>] (__lock_acquire)
| [<8007184c>] (lock_acquire)
| [<80287800>] (btrfs_ioctl)
| [<8012a8d4>] (do_vfs_ioctl)
| [<8012ac14>] (SyS_ioctl)
so I think that btrfs_device_data_ordered_init() is not invoked behind
a macro somewhere.
Fixes: 7cc8e58d53cd ("Btrfs: fix unprotected device's variants on 32bits machine")
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
fs/btrfs/volumes.c | 1 +
1 file changed, 1 insertion(+)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -232,6 +232,7 @@ static struct btrfs_device *__alloc_devi
spin_lock_init(&dev->reada_lock);
atomic_set(&dev->reada_in_flight, 0);
atomic_set(&dev->dev_stats_ccnt, 0);
+ btrfs_device_data_ordered_init(dev);
INIT_RADIX_TREE(&dev->reada_zones, GFP_NOFS & ~__GFP_DIRECT_RECLAIM);
INIT_RADIX_TREE(&dev->reada_extents, GFP_NOFS & ~__GFP_DIRECT_RECLAIM);

2
debian/patches/features/all/rt/bug-rt-dependend-variants.patch vendored
View File

@ -1,7 +1,7 @@
From: Ingo Molnar <mingo@elte.hu>
Date: Fri, 3 Jul 2009 08:29:58 -0500
Subject: bug: BUG_ON/WARN_ON variants dependend on RT/!RT
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Introduce RT/NON-RT WARN/BUG statements to avoid ifdefs in the code.

2
debian/patches/features/all/rt/cgroups-scheduling-while-atomic-in-cgroup-code.patch vendored
View File

@ -1,7 +1,7 @@
From: Mike Galbraith <umgwanakikbuti@gmail.com>
Date: Sat, 21 Jun 2014 10:09:48 +0200
Subject: memcontrol: Prevent scheduling while atomic in cgroup code
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
mm, memcg: make refill_stock() use get_cpu_light()

2
debian/patches/features/all/rt/cgroups-use-simple-wait-in-css_release.patch vendored
View File

@ -1,7 +1,7 @@
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Fri, 13 Feb 2015 15:52:24 +0100
Subject: cgroups: use simple wait in css_release()
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
To avoid:
|BUG: sleeping function called from invalid context at kernel/locking/rtmutex.c:914

2
debian/patches/features/all/rt/clocksource-tclib-allow-higher-clockrates.patch vendored
View File

@ -1,7 +1,7 @@
From: Benedikt Spranger <b.spranger@linutronix.de>
Date: Mon, 8 Mar 2010 18:57:04 +0100
Subject: clocksource: TCLIB: Allow higher clock rates for clock events
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
As default the TCLIB uses the 32KiHz base clock rate for clock events.
Add a compile time selection to allow higher clock resulution.

6
debian/patches/features/all/rt/completion-use-simple-wait-queues.patch vendored
View File

@ -1,7 +1,7 @@
Subject: completion: Use simple wait queues
From: Thomas Gleixner <tglx@linutronix.de>
Date: Fri, 11 Jan 2013 11:23:51 +0100
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Completions have no long lasting callbacks and therefor do not need
the complex waitqueue variant. Use simple waitqueues which reduces the
@ -199,7 +199,7 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
EXPORT_SYMBOL(completion_done);
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3143,7 +3143,10 @@ void migrate_disable(void)
@@ -3102,7 +3102,10 @@ void migrate_disable(void)
}
#ifdef CONFIG_SCHED_DEBUG
@ -211,7 +211,7 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
#endif
if (p->migrate_disable) {
@@ -3173,7 +3176,10 @@ void migrate_enable(void)
@@ -3130,7 +3133,10 @@ void migrate_enable(void)
}
#ifdef CONFIG_SCHED_DEBUG

2
debian/patches/features/all/rt/cond-resched-lock-rt-tweak.patch vendored
View File

@ -1,7 +1,7 @@
Subject: sched: Use the proper LOCK_OFFSET for cond_resched()
From: Thomas Gleixner <tglx@linutronix.de>
Date: Sun, 17 Jul 2011 22:51:33 +0200
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
RT does not increment preempt count when a 'sleeping' spinlock is
locked. Update PREEMPT_LOCK_OFFSET for that case.

6
debian/patches/features/all/rt/cond-resched-softirq-rt.patch vendored
View File

@ -1,7 +1,7 @@
Subject: sched: Take RT softirq semantics into account in cond_resched()
From: Thomas Gleixner <tglx@linutronix.de>
Date: Thu, 14 Jul 2011 09:56:44 +0200
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
The softirq semantics work different on -RT. There is no SOFTIRQ_MASK in
the preemption counter which leads to the BUG_ON() statement in
@ -35,7 +35,7 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
{
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4832,6 +4832,7 @@ int __cond_resched_lock(spinlock_t *lock
@@ -4771,6 +4771,7 @@ int __cond_resched_lock(spinlock_t *lock
}
EXPORT_SYMBOL(__cond_resched_lock);
@ -43,7 +43,7 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
int __sched __cond_resched_softirq(void)
{
BUG_ON(!in_softirq());
@@ -4845,6 +4846,7 @@ int __sched __cond_resched_softirq(void)
@@ -4784,6 +4785,7 @@ int __sched __cond_resched_softirq(void)
return 0;
}
EXPORT_SYMBOL(__cond_resched_softirq);

2
debian/patches/features/all/rt/cpu-hotplug-Document-why-PREEMPT_RT-uses-a-spinlock.patch vendored
View File

@ -1,7 +1,7 @@
From: Steven Rostedt <rostedt@goodmis.org>
Date: Thu, 5 Dec 2013 09:16:52 -0500
Subject: cpu hotplug: Document why PREEMPT_RT uses a spinlock
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
The patch:

2
debian/patches/features/all/rt/cpu-rt-make-hotplug-lock-a-sleeping-spinlock-on-rt.patch vendored
View File

@ -1,7 +1,7 @@
Subject: cpu: Make hotplug.lock a "sleeping" spinlock on RT
From: Steven Rostedt <rostedt@goodmis.org>
Date: Fri, 02 Mar 2012 10:36:57 -0500
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Tasks can block on hotplug.lock in pin_current_cpu(), but their state
might be != RUNNING. So the mutex wakeup will set the state

16
debian/patches/features/all/rt/cpu-rt-rework-cpu-down.patch vendored
View File

@ -1,7 +1,7 @@
From: Steven Rostedt <srostedt@redhat.com>
Date: Mon, 16 Jul 2012 08:07:43 +0000
Subject: cpu/rt: Rework cpu down for PREEMPT_RT
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Bringing a CPU down is a pain with the PREEMPT_RT kernel because
tasks can be preempted in many more places than in non-RT. In
@ -57,7 +57,7 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2284,6 +2284,10 @@ extern void do_set_cpus_allowed(struct t
@@ -2287,6 +2287,10 @@ extern void do_set_cpus_allowed(struct t
extern int set_cpus_allowed_ptr(struct task_struct *p,
const struct cpumask *new_mask);
@ -68,7 +68,7 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
#else
static inline void do_set_cpus_allowed(struct task_struct *p,
const struct cpumask *new_mask)
@@ -2296,6 +2300,9 @@ static inline int set_cpus_allowed_ptr(s
@@ -2299,6 +2303,9 @@ static inline int set_cpus_allowed_ptr(s
return -EINVAL;
return 0;
}
@ -443,7 +443,7 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* interrupt affinities.
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1220,6 +1220,84 @@ void do_set_cpus_allowed(struct task_str
@@ -1211,6 +1211,84 @@ void do_set_cpus_allowed(struct task_str
enqueue_task(rq, p, ENQUEUE_RESTORE);
}
@ -528,7 +528,7 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
/*
* Change a given task's CPU affinity. Migrate the thread to a
* proper CPU and schedule it away if the CPU it's executing on
@@ -3085,7 +3163,7 @@ void migrate_disable(void)
@@ -3044,7 +3122,7 @@ void migrate_disable(void)
{
struct task_struct *p = current;
@ -537,9 +537,9 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
#ifdef CONFIG_SCHED_DEBUG
p->migrate_disable_atomic++;
#endif
@@ -3118,7 +3196,7 @@ void migrate_enable(void)
unsigned long flags;
struct rq *rq;
@@ -3075,7 +3153,7 @@ void migrate_enable(void)
{
struct task_struct *p = current;
- if (in_atomic() || p->flags & PF_NO_SETAFFINITY) {
+ if (in_atomic()) {

14
debian/patches/features/all/rt/cpu_chill-Add-a-UNINTERRUPTIBLE-hrtimer_nanosleep.patch vendored
View File

@ -1,7 +1,7 @@
From: Steven Rostedt <rostedt@goodmis.org>
Date: Tue, 4 Mar 2014 12:28:32 -0500
Subject: cpu_chill: Add a UNINTERRUPTIBLE hrtimer_nanosleep
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
We hit another bug that was caused by switching cpu_chill() from
msleep() to hrtimer_nanosleep().
@ -34,7 +34,7 @@ Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -1657,12 +1657,13 @@ void hrtimer_init_sleeper(struct hrtimer
@@ -1656,12 +1656,13 @@ void hrtimer_init_sleeper(struct hrtimer
}
EXPORT_SYMBOL_GPL(hrtimer_init_sleeper);
@ -50,7 +50,7 @@ Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
hrtimer_start_expires(&t->timer, mode);
if (likely(t->task))
@@ -1704,7 +1705,8 @@ long __sched hrtimer_nanosleep_restart(s
@@ -1703,7 +1704,8 @@ long __sched hrtimer_nanosleep_restart(s
HRTIMER_MODE_ABS);
hrtimer_set_expires_tv64(&t.timer, restart->nanosleep.expires);
@ -60,7 +60,7 @@ Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
goto out;
rmtp = restart->nanosleep.rmtp;
@@ -1721,8 +1723,10 @@ long __sched hrtimer_nanosleep_restart(s
@@ -1720,8 +1722,10 @@ long __sched hrtimer_nanosleep_restart(s
return ret;
}
@ -73,7 +73,7 @@ Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
{
struct restart_block *restart;
struct hrtimer_sleeper t;
@@ -1735,7 +1739,7 @@ long hrtimer_nanosleep(struct timespec *
@@ -1734,7 +1738,7 @@ long hrtimer_nanosleep(struct timespec *
hrtimer_init_on_stack(&t.timer, clockid, mode);
hrtimer_set_expires_range_ns(&t.timer, timespec_to_ktime(*rqtp), slack);
@ -82,7 +82,7 @@ Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
goto out;
/* Absolute timers do not update the rmtp value and restart: */
@@ -1762,6 +1766,12 @@ long hrtimer_nanosleep(struct timespec *
@@ -1761,6 +1765,12 @@ long hrtimer_nanosleep(struct timespec *
return ret;
}
@ -95,7 +95,7 @@ Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
SYSCALL_DEFINE2(nanosleep, struct timespec __user *, rqtp,
struct timespec __user *, rmtp)
{
@@ -1788,7 +1798,8 @@ void cpu_chill(void)
@@ -1787,7 +1797,8 @@ void cpu_chill(void)
unsigned int freeze_flag = current->flags & PF_NOFREEZE;
current->flags |= PF_NOFREEZE;

2
debian/patches/features/all/rt/cpu_down_move_migrate_enable_back.patch vendored
View File

@ -1,7 +1,7 @@
From: Tiejun Chen <tiejun.chen@windriver.com>
Subject: cpu_down: move migrate_enable() back
Date: Thu, 7 Nov 2013 10:06:07 +0800
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Commit 08c1ab68, "hotplug-use-migrate-disable.patch", intends to
use migrate_enable()/migrate_disable() to replace that combination

2
debian/patches/features/all/rt/cpufreq-drop-K8-s-driver-from-beeing-selected.patch vendored
View File

@ -1,7 +1,7 @@
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Thu, 9 Apr 2015 15:23:01 +0200
Subject: cpufreq: drop K8's driver from beeing selected
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Ralf posted a picture of a backtrace from

2
debian/patches/features/all/rt/cpumask-disable-offstack-on-rt.patch vendored
View File

@ -1,7 +1,7 @@
Subject: cpumask: Disable CONFIG_CPUMASK_OFFSTACK for RT
From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 14 Dec 2011 01:03:49 +0100
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
We can't deal with the cpumask allocations which happen in atomic
context (see arch/x86/kernel/apic/io_apic.c) on RT right now.

2
debian/patches/features/all/rt/crypto-Reduce-preempt-disabled-regions-more-algos.patch vendored
View File

@ -1,7 +1,7 @@
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Fri, 21 Feb 2014 17:24:04 +0100
Subject: crypto: Reduce preempt disabled regions, more algos
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Don Estabrook reported
| kernel: WARNING: CPU: 2 PID: 858 at kernel/sched/core.c:2428 migrate_disable+0xed/0x100()

2
debian/patches/features/all/rt/debugobjects-rt.patch vendored
View File

@ -1,7 +1,7 @@
Subject: debugobjects: Make RT aware
From: Thomas Gleixner <tglx@linutronix.de>
Date: Sun, 17 Jul 2011 21:41:35 +0200
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Avoid filling the pool / allocating memory with irqs off().

2
debian/patches/features/all/rt/dm-make-rt-aware.patch vendored
View File

@ -1,7 +1,7 @@
Subject: dm: Make rt aware
From: Thomas Gleixner <tglx@linutronix.de>
Date: Mon, 14 Nov 2011 23:06:09 +0100
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Use the BUG_ON_NORT variant for the irq_disabled() checks. RT has
interrupts legitimately enabled here as we cant deadlock against the

26
debian/patches/features/all/rt/drivers-cpuidle-coupled-fix-warning-cpuidle_coupled_.patch vendored Normal file
View File

@ -0,0 +1,26 @@
From: Anders Roxell <anders.roxell@linaro.org>
Date: Fri, 15 Jan 2016 20:21:12 +0100
Subject: drivers/cpuidle: coupled: fix warning cpuidle_coupled_lock
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Used multi_v7_defconfig+PREEMPT_RT_FULL=y and this caused a compilation
warning without this fix:
../drivers/cpuidle/coupled.c:122:21: warning: 'cpuidle_coupled_lock'
defined but not used [-Wunused-variable]
Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
drivers/cpuidle/coupled.c | 1 -
1 file changed, 1 deletion(-)
--- a/drivers/cpuidle/coupled.c
+++ b/drivers/cpuidle/coupled.c
@@ -119,7 +119,6 @@ struct cpuidle_coupled {
#define CPUIDLE_COUPLED_NOT_IDLE (-1)
-static DEFINE_MUTEX(cpuidle_coupled_lock);
static DEFINE_PER_CPU(struct call_single_data, cpuidle_coupled_poke_cb);
/*

33
debian/patches/features/all/rt/drivers-media-vsp1_video-fix-compile-error.patch vendored Normal file
View File

@ -0,0 +1,33 @@
From: Anders Roxell <anders.roxell@linaro.org>
Date: Fri, 15 Jan 2016 01:09:43 +0100
Subject: drivers/media: vsp1_video: fix compile error
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
This was found with the -RT patch enabled, but the fix should apply to
non-RT also.
Compilation error without this fix:
../drivers/media/platform/vsp1/vsp1_video.c: In function
'vsp1_pipeline_stopped':
../drivers/media/platform/vsp1/vsp1_video.c:524:2: error: expected
expression before 'do'
spin_unlock_irqrestore(&pipe->irqlock, flags);
^
Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
drivers/media/platform/vsp1/vsp1_video.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/media/platform/vsp1/vsp1_video.c
+++ b/drivers/media/platform/vsp1/vsp1_video.c
@@ -520,7 +520,7 @@ static bool vsp1_pipeline_stopped(struct
bool stopped;
spin_lock_irqsave(&pipe->irqlock, flags);
- stopped = pipe->state == VSP1_PIPELINE_STOPPED,
+ stopped = pipe->state == VSP1_PIPELINE_STOPPED;
spin_unlock_irqrestore(&pipe->irqlock, flags);
return stopped;

2
debian/patches/features/all/rt/drivers-net-8139-disable-irq-nosync.patch vendored
View File

@ -1,7 +1,7 @@
From: Ingo Molnar <mingo@elte.hu>
Date: Fri, 3 Jul 2009 08:29:24 -0500
Subject: drivers/net: Use disable_irq_nosync() in 8139too
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Use disable_irq_nosync() instead of disable_irq() as this might be
called in atomic context with netpoll.

2
debian/patches/features/all/rt/drivers-net-fix-livelock-issues.patch vendored
View File

@ -1,7 +1,7 @@
From: Thomas Gleixner <tglx@linutronix.de>
Date: Sat, 20 Jun 2009 11:36:54 +0200
Subject: drivers/net: fix livelock issues
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Preempt-RT runs into a live lock issue with the NETDEV_TX_LOCKED micro
optimization. The reason is that the softirq thread is rescheduling

2
debian/patches/features/all/rt/drivers-net-vortex-fix-locking-issues.patch vendored
View File

@ -1,7 +1,7 @@
From: Steven Rostedt <rostedt@goodmis.org>
Date: Fri, 3 Jul 2009 08:30:00 -0500
Subject: drivers/net: vortex fix locking issues
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Argh, cut and paste wasn't enough...

2
debian/patches/features/all/rt/drivers-random-reduce-preempt-disabled-region.patch vendored
View File

@ -1,7 +1,7 @@
From: Ingo Molnar <mingo@elte.hu>
Date: Fri, 3 Jul 2009 08:29:30 -0500
Subject: drivers: random: Reduce preempt disabled region
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
No need to keep preemption disabled across the whole function.

2
debian/patches/features/all/rt/drivers-tty-fix-omap-lock-crap.patch vendored
View File

@ -1,7 +1,7 @@
Subject: tty/serial/omap: Make the locking RT aware
From: Thomas Gleixner <tglx@linutronix.de>
Date: Thu, 28 Jul 2011 13:32:57 +0200
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
The lock is a sleeping lock and local_irq_save() is not the
optimsation we are looking for. Redo it to make it work on -RT and

2
debian/patches/features/all/rt/drivers-tty-pl011-irq-disable-madness.patch vendored
View File

@ -1,7 +1,7 @@
Subject: tty/serial/pl011: Make the locking work on RT
From: Thomas Gleixner <tglx@linutronix.de>
Date: Tue, 08 Jan 2013 21:36:51 +0100
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
The lock is a sleeping lock and local_irq_save() is not the optimsation
we are looking for. Redo it to make it work on -RT and non-RT.

2
debian/patches/features/all/rt/drm-i915-drop-trace_i915_gem_ring_dispatch-onrt.patch vendored
View File

@ -1,7 +1,7 @@
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Thu, 25 Apr 2013 18:12:52 +0200
Subject: drm/i915: drop trace_i915_gem_ring_dispatch on rt
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
This tracepoint is responsible for:

2
debian/patches/features/all/rt/dump-stack-don-t-disable-preemption-during-trace.patch vendored
View File

@ -1,7 +1,7 @@
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sun, 16 Aug 2015 14:27:50 +0200
Subject: dump stack: don't disable preemption during trace
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
I see here large latencies during a stack dump on x86. The
preempt_disable() and get_cpu() should forbid moving the task to another

2
debian/patches/features/all/rt/epoll-use-get-cpu-light.patch vendored
View File

@ -1,7 +1,7 @@
Subject: fs/epoll: Do not disable preemption on RT
From: Thomas Gleixner <tglx@linutronix.de>
Date: Fri, 08 Jul 2011 16:35:35 +0200
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
ep_call_nested() takes a sleeping lock so we can't disable preemption.
The light version is enough since ep_call_nested() doesn't mind beeing

2
debian/patches/features/all/rt/fs-aio-simple-simple-work.patch vendored
View File

@ -1,7 +1,7 @@
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Mon, 16 Feb 2015 18:49:10 +0100
Subject: fs/aio: simple simple work
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
|BUG: sleeping function called from invalid context at kernel/locking/rtmutex.c:768
|in_atomic(): 1, irqs_disabled(): 0, pid: 26, name: rcuos/2

2
debian/patches/features/all/rt/fs-block-rt-support.patch vendored
View File

@ -1,7 +1,7 @@
Subject: block: Turn off warning which is bogus on RT
From: Thomas Gleixner <tglx@linutronix.de>
Date: Tue, 14 Jun 2011 17:05:09 +0200
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
On -RT the context is always with IRQs enabled. Ignore this warning on -RT.

2
debian/patches/features/all/rt/fs-dcache-use-cpu-chill-in-trylock-loops.patch vendored
View File

@ -1,7 +1,7 @@
Subject: fs: dcache: Use cpu_chill() in trylock loops
From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 07 Mar 2012 21:00:34 +0100
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Retry loops on RT might loop forever when the modifying side was
preempted. Use cpu_chill() instead of cpu_relax() to let the system

2
debian/patches/features/all/rt/fs-jbd-replace-bh_state-lock.patch vendored
View File

@ -1,7 +1,7 @@
From: Thomas Gleixner <tglx@linutronix.de>
Date: Fri, 18 Mar 2011 10:11:25 +0100
Subject: fs: jbd/jbd2: Make state lock and journal head lock rt safe
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
bit_spin_locks break under RT.

2
debian/patches/features/all/rt/fs-jbd2-pull-your-plug-when-waiting-for-space.patch vendored
View File

@ -1,7 +1,7 @@
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Mon, 17 Feb 2014 17:30:03 +0100
Subject: fs: jbd2: pull your plug when waiting for space
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Two cps in parallel managed to stall the the ext4 fs. It seems that
journal code is either waiting for locks or sleeping waiting for

2
debian/patches/features/all/rt/fs-namespace-preemption-fix.patch vendored
View File

@ -1,7 +1,7 @@
From: Thomas Gleixner <tglx@linutronix.de>
Date: Sun, 19 Jul 2009 08:44:27 -0500
Subject: fs: namespace preemption fix
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
On RT we cannot loop with preemption disabled here as
mnt_make_readonly() might have been preempted. We can safely enable

2
debian/patches/features/all/rt/fs-ntfs-disable-interrupt-non-rt.patch vendored
View File

@ -1,7 +1,7 @@
From: Mike Galbraith <efault@gmx.de>
Date: Fri, 3 Jul 2009 08:44:12 -0500
Subject: fs: ntfs: disable interrupt only on !RT
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
On Sat, 2007-10-27 at 11:44 +0200, Ingo Molnar wrote:
> * Nick Piggin <nickpiggin@yahoo.com.au> wrote:

2
debian/patches/features/all/rt/fs-replace-bh_uptodate_lock-for-rt.patch vendored
View File

@ -1,7 +1,7 @@
From: Thomas Gleixner <tglx@linutronix.de>
Date: Fri, 18 Mar 2011 09:18:52 +0100
Subject: buffer_head: Replace bh_uptodate_lock for -rt
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Wrap the bit_spin_lock calls into a separate inline and add the RT
replacements with a real spinlock.

2
debian/patches/features/all/rt/ftrace-migrate-disable-tracing.patch vendored
View File

@ -1,7 +1,7 @@
From: Thomas Gleixner <tglx@linutronix.de>
Date: Sun, 17 Jul 2011 21:56:42 +0200
Subject: trace: Add migrate-disabled counter to tracing output
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---

2
debian/patches/features/all/rt/futex-requeue-pi-fix.patch vendored
View File

@ -1,7 +1,7 @@
From: Steven Rostedt <rostedt@goodmis.org>
Date: Tue, 14 Jul 2015 14:26:34 +0200
Subject: futex: Fix bug on when a requeued RT task times out
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Requeue with timeout causes a bug with PREEMPT_RT_FULL.

2
debian/patches/features/all/rt/genirq-disable-irqpoll-on-rt.patch vendored
View File

@ -1,7 +1,7 @@
From: Ingo Molnar <mingo@elte.hu>
Date: Fri, 3 Jul 2009 08:29:57 -0500
Subject: genirq: Disable irqpoll on -rt
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Creates long latencies for no value

16
debian/patches/features/all/rt/genirq-do-not-invoke-the-affinity-callback-via-a-wor.patch vendored
View File

@ -1,7 +1,7 @@
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Wed, 21 Aug 2013 17:48:46 +0200
Subject: genirq: Do not invoke the affinity callback via a workqueue on RT
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Joe Korty reported, that __irq_set_affinity_locked() schedules a
workqueue while holding a rawlock which results in a might_sleep()
@ -11,13 +11,21 @@ wakeup() a process while holding the lock.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
include/linux/interrupt.h | 1
include/linux/interrupt.h | 2 +
kernel/irq/manage.c | 79 ++++++++++++++++++++++++++++++++++++++++++++--
2 files changed, 77 insertions(+), 3 deletions(-)
2 files changed, 78 insertions(+), 3 deletions(-)
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -217,6 +217,7 @@ struct irq_affinity_notify {
@@ -206,6 +206,7 @@ extern void resume_device_irqs(void);
* @irq: Interrupt to which notification applies
* @kref: Reference count, for internal use
* @work: Work item, for internal use
+ * @list: List item for deferred callbacks
* @notify: Function to be called on change. This will be
* called in process context.
* @release: Function to be called on release. This will be
@@ -217,6 +218,7 @@ struct irq_affinity_notify {
unsigned int irq;
struct kref kref;
struct work_struct work;

2
debian/patches/features/all/rt/genirq-force-threading.patch vendored
View File

@ -1,7 +1,7 @@
Subject: genirq: Force interrupt thread on RT
From: Thomas Gleixner <tglx@linutronix.de>
Date: Sun, 03 Apr 2011 11:57:29 +0200
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Force threaded_irqs and optimize the code (force_irqthreads) in regard
to this.

2
debian/patches/features/all/rt/hotplug-Use-set_cpus_allowed_ptr-in-sync_unplug_thre.patch vendored
View File

@ -1,7 +1,7 @@
From: Mike Galbraith <umgwanakikbuti@gmail.com>
Date: Tue, 24 Mar 2015 08:14:49 +0100
Subject: hotplug: Use set_cpus_allowed_ptr() in sync_unplug_thread()
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
do_set_cpus_allowed() is not safe vs ->sched_class change.

2
debian/patches/features/all/rt/hotplug-light-get-online-cpus.patch vendored
View File

@ -1,7 +1,7 @@
Subject: hotplug: Lightweight get online cpus
From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 15 Jun 2011 12:36:06 +0200
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
get_online_cpus() is a heavy weight function which involves a global
mutex. migrate_disable() wants a simpler construct which prevents only

2
debian/patches/features/all/rt/hotplug-sync_unplug-no-27-5cn-27-in-task-name.patch vendored
View File

@ -1,7 +1,7 @@
Subject: hotplug: sync_unplug: No "\n" in task name
From: Yong Zhang <yong.zhang0@gmail.com>
Date: Sun, 16 Oct 2011 18:56:43 +0800
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Otherwise the output will look a little odd.

2
debian/patches/features/all/rt/hotplug-use-migrate-disable.patch vendored
View File

@ -1,7 +1,7 @@
Subject: hotplug: Use migrate disable on unplug
From: Thomas Gleixner <tglx@linutronix.de>
Date: Sun, 17 Jul 2011 19:35:29 +0200
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Migration needs to be disabled accross the unplug handling to make
sure that the unplug thread is off the unplugged cpu.

2
debian/patches/features/all/rt/hrtimer-Move-schedule_work-call-to-helper-thread.patch vendored
View File

@ -1,7 +1,7 @@
From: Yang Shi <yang.shi@windriver.com>
Date: Mon, 16 Sep 2013 14:09:19 -0700
Subject: hrtimer: Move schedule_work call to helper thread
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
When run ltp leapsec_timer test, the following call trace is caught:

7
debian/patches/features/all/rt/hrtimer-enfore-64byte-alignment.patch vendored
View File

@ -1,8 +1,7 @@
From e35e67cb032e78055b63eae5a3a370664fabfc01 Mon Sep 17 00:00:00 2001
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Wed, 23 Dec 2015 20:57:41 +0100
Subject: [PATCH] hrtimer: enfore 64byte alignment
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Subject: hrtimer: enfore 64byte alignment
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
The patch "hrtimer: Fixup hrtimer callback changes for preempt-rt" adds
a list_head expired to struct hrtimer_clock_base and with it we run into
@ -15,7 +14,7 @@ Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -124,11 +124,7 @@ struct hrtimer_sleeper {
@@ -125,11 +125,7 @@ struct hrtimer_sleeper {
struct task_struct *task;
};

54
debian/patches/features/all/rt/hrtimer-fixup-hrtimer-callback-changes-for-preempt-r.patch vendored
View File

@ -1,7 +1,7 @@
From: Thomas Gleixner <tglx@linutronix.de>
Date: Fri, 3 Jul 2009 08:44:31 -0500
Subject: hrtimer: Fixup hrtimer callback changes for preempt-rt
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
In preempt-rt we can not call the callbacks which take sleeping locks
from the timer interrupt context.
@ -11,19 +11,28 @@ delivery problem for real.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
[bwh: Adjust context to apply after fixed latency-hist.patch]
---
include/linux/hrtimer.h | 4 +
include/linux/hrtimer.h | 7 ++
kernel/sched/core.c | 1
kernel/sched/rt.c | 1
kernel/time/hrtimer.c | 142 +++++++++++++++++++++++++++++++++++++++++++----
kernel/time/hrtimer.c | 137 +++++++++++++++++++++++++++++++++++++++++++----
kernel/time/tick-sched.c | 1
kernel/watchdog.c | 1
6 files changed, 139 insertions(+), 11 deletions(-)
6 files changed, 139 insertions(+), 9 deletions(-)
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -102,6 +102,8 @@ struct hrtimer {
@@ -87,6 +87,8 @@ enum hrtimer_restart {
* @function: timer expiry callback function
* @base: pointer to the timer base (per cpu and per clock)
* @state: state information (See bit values above)
+ * @cb_entry: list entry to defer timers from hardirq context
+ * @irqsafe: timer can run in hardirq context
* @praecox: timer expiry time if expired at the time of programming
* @start_pid: timer statistics field to store the pid of the task which
* started the timer
@@ -103,6 +105,8 @@ struct hrtimer {
enum hrtimer_restart (*function)(struct hrtimer *);
struct hrtimer_clock_base *base;
unsigned long state;
@ -32,7 +41,15 @@ Signed-off-by: Ingo Molnar <mingo@elte.hu>
#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
ktime_t praecox;
#endif
@@ -141,6 +143,7 @@ struct hrtimer_clock_base {
@@ -134,6 +138,7 @@ struct hrtimer_sleeper {
* timer to a base on another cpu.
* @clockid: clock id for per_cpu support
* @active: red black tree root node for the active timers
+ * @expired: list head for deferred timers.
* @get_time: function to retrieve the current time of the clock
* @offset: offset of this clock to the monotonic base
*/
@@ -142,6 +147,7 @@ struct hrtimer_clock_base {
int index;
clockid_t clockid;
struct timerqueue_head active;
@ -40,7 +57,7 @@ Signed-off-by: Ingo Molnar <mingo@elte.hu>
ktime_t (*get_time)(void);
ktime_t offset;
} __attribute__((__aligned__(HRTIMER_CLOCK_BASE_ALIGN)));
@@ -184,6 +187,7 @@ struct hrtimer_cpu_base {
@@ -185,6 +191,7 @@ struct hrtimer_cpu_base {
raw_spinlock_t lock;
seqcount_t seq;
struct hrtimer *running;
@ -121,7 +138,7 @@ Signed-off-by: Ingo Molnar <mingo@elte.hu>
cpu_base->running == timer)
return true;
@@ -1292,12 +1296,113 @@ static void __run_hrtimer(struct hrtimer
@@ -1292,12 +1296,112 @@ static void __run_hrtimer(struct hrtimer
cpu_base->running = NULL;
}
@ -223,7 +240,6 @@ Signed-off-by: Ingo Molnar <mingo@elte.hu>
+static inline int hrtimer_rt_defer(struct hrtimer *timer) { return 0; }
+
+#endif
+
+
static enum hrtimer_restart hrtimer_wakeup(struct hrtimer *timer);
@ -235,15 +251,15 @@ Signed-off-by: Ingo Molnar <mingo@elte.hu>
for (; active; base++, active >>= 1) {
struct timerqueue_node *node;
@@ -1337,9 +1442,14 @@ static void __hrtimer_run_queues(struct
@@ -1337,9 +1441,14 @@ static void __hrtimer_run_queues(struct
if (basenow.tv64 < hrtimer_get_softexpires_tv64(timer))
break;
- __run_hrtimer(cpu_base, base, timer, &basenow);
+ if (!hrtimer_rt_defer(timer))
+ __run_hrtimer(cpu_base, base, timer, &basenow);
+ else
+ raise = 1;
+ if (!hrtimer_rt_defer(timer))
+ __run_hrtimer(cpu_base, base, timer, &basenow);
+ else
+ raise = 1;
}
}
+ if (raise)
@ -251,7 +267,7 @@ Signed-off-by: Ingo Molnar <mingo@elte.hu>
}
#ifdef CONFIG_HIGH_RES_TIMERS
@@ -1481,8 +1591,6 @@ void hrtimer_run_queues(void)
@@ -1481,8 +1590,6 @@ void hrtimer_run_queues(void)
now = hrtimer_update_base(cpu_base);
__hrtimer_run_queues(cpu_base, now);
raw_spin_unlock(&cpu_base->lock);
@ -260,7 +276,7 @@ Signed-off-by: Ingo Molnar <mingo@elte.hu>
}
/*
@@ -1504,6 +1612,7 @@ static enum hrtimer_restart hrtimer_wake
@@ -1504,6 +1611,7 @@ static enum hrtimer_restart hrtimer_wake
void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, struct task_struct *task)
{
sl->timer.function = hrtimer_wakeup;
@ -268,7 +284,7 @@ Signed-off-by: Ingo Molnar <mingo@elte.hu>
sl->task = task;
}
EXPORT_SYMBOL_GPL(hrtimer_init_sleeper);
@@ -1638,6 +1747,7 @@ static void init_hrtimers_cpu(int cpu)
@@ -1638,6 +1746,7 @@ static void init_hrtimers_cpu(int cpu)
for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
cpu_base->clock_base[i].cpu_base = cpu_base;
timerqueue_init_head(&cpu_base->clock_base[i].active);
@ -276,7 +292,7 @@ Signed-off-by: Ingo Molnar <mingo@elte.hu>
}
cpu_base->cpu = cpu;
@@ -1742,11 +1852,21 @@ static struct notifier_block hrtimers_nb
@@ -1742,11 +1851,21 @@ static struct notifier_block hrtimers_nb
.notifier_call = hrtimer_cpu_notify,
};

8
debian/patches/features/all/rt/hrtimers-prepare-full-preemption.patch vendored
View File

@ -1,7 +1,7 @@
From: Ingo Molnar <mingo@elte.hu>
Date: Fri, 3 Jul 2009 08:29:34 -0500
Subject: hrtimers: Prepare full preemption
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Make cancellation of a running callback in softirq context safe
against preemption.
@ -18,7 +18,7 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -204,6 +204,9 @@ struct hrtimer_cpu_base {
@@ -205,6 +205,9 @@ struct hrtimer_cpu_base {
unsigned int nr_hangs;
unsigned int max_hang_time;
#endif
@ -28,7 +28,7 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
struct hrtimer_clock_base clock_base[HRTIMER_MAX_CLOCK_BASES];
} ____cacheline_aligned;
@@ -392,6 +395,13 @@ static inline void hrtimer_restart(struc
@@ -393,6 +396,13 @@ static inline void hrtimer_restart(struc
hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
}
@ -42,7 +42,7 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
/* Query timers: */
extern ktime_t hrtimer_get_remaining(const struct hrtimer *timer);
@@ -411,7 +421,7 @@ static inline int hrtimer_is_queued(stru
@@ -412,7 +422,7 @@ static inline int hrtimer_is_queued(stru
* Helper function to check, whether the timer is running the callback
* function
*/

2
debian/patches/features/all/rt/hwlat-detector-Don-t-ignore-threshold-module-paramet.patch vendored
View File

@ -1,7 +1,7 @@
From: Mike Galbraith <bitbucket@online.de>
Date: Fri, 30 Aug 2013 07:57:25 +0200
Subject: hwlat-detector: Don't ignore threshold module parameter
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
If the user specified a threshold at module load time, use it.

2
debian/patches/features/all/rt/hwlat-detector-Update-hwlat_detector-to-add-outer-lo.patch vendored
View File

@ -1,7 +1,7 @@
From: Steven Rostedt <rostedt@goodmis.org>
Date: Mon, 19 Aug 2013 17:33:25 -0400
Subject: hwlat-detector: Update hwlat_detector to add outer loop detection
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
The hwlat_detector reads two timestamps in a row, then reports any
gap between those calls. The problem is, it misses everything between

2
debian/patches/features/all/rt/hwlat-detector-Use-thread-instead-of-stop-machine.patch vendored
View File

@ -1,7 +1,7 @@
From: Steven Rostedt <rostedt@goodmis.org>
Date: Mon, 19 Aug 2013 17:33:27 -0400
Subject: hwlat-detector: Use thread instead of stop machine
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
There's no reason to use stop machine to search for hardware latency.
Simply disabling interrupts while running the loop will do enough to

2
debian/patches/features/all/rt/hwlat-detector-Use-trace_clock_local-if-available.patch vendored
View File

@ -1,7 +1,7 @@
From: Steven Rostedt <rostedt@goodmis.org>
Date: Mon, 19 Aug 2013 17:33:26 -0400
Subject: hwlat-detector: Use trace_clock_local if available
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
As ktime_get() calls into the timing code which does a read_seq(), it
may be affected by other CPUS that touch that lock. To remove this

12
debian/patches/features/all/rt/hwlatdetect.patch vendored
View File

@ -1,7 +1,7 @@
Subject: hwlatdetect.patch
From: Carsten Emde <C.Emde@osadl.org>
Date: Tue, 19 Jul 2011 13:53:12 +0100
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Jon Masters developed this wonderful SMI detector. For details please
consult Documentation/hwlat_detector.txt. It could be ported to Linux
@ -725,7 +725,7 @@ Signed-off-by: Carsten Emde <C.Emde@osadl.org>
+
+ buf[sizeof(buf)-1] = '\0'; /* just in case */
+ err = kstrtoul(buf, 10, &val);
+ if (0 != err)
+ if (err)
+ return -EINVAL;
+
+ if (val) {
@ -1029,7 +1029,7 @@ Signed-off-by: Carsten Emde <C.Emde@osadl.org>
+
+ buf[U64STR_SIZE-1] = '\0'; /* just in case */
+ err = kstrtoull(buf, 10, &val);
+ if (0 != err)
+ if (err)
+ return -EINVAL;
+
+ mutex_lock(&data.lock);
@ -1113,7 +1113,7 @@ Signed-off-by: Carsten Emde <C.Emde@osadl.org>
+
+ buf[U64STR_SIZE-1] = '\0'; /* just in case */
+ err = kstrtoull(buf, 10, &val);
+ if (0 != err)
+ if (err)
+ return -EINVAL;
+
+ mutex_lock(&data.lock);
@ -1306,11 +1306,11 @@ Signed-off-by: Carsten Emde <C.Emde@osadl.org>
+ pr_info(BANNER "version %s\n", VERSION);
+
+ ret = init_stats();
+ if (0 != ret)
+ if (ret)
+ goto out;
+
+ ret = init_debugfs();
+ if (0 != ret)
+ if (ret)
+ goto err_stats;
+
+ if (enabled)

2
debian/patches/features/all/rt/i2c-omap-drop-the-lock-hard-irq-context.patch vendored
View File

@ -1,7 +1,7 @@
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Thu, 21 Mar 2013 11:35:49 +0100
Subject: i2c/omap: drop the lock hard irq context
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
The lock is taken while reading two registers. On RT the first lock is
taken in hard irq where it might sleep and in the threaded irq.

2
debian/patches/features/all/rt/i915-bogus-warning-from-i915-when-running-on-PREEMPT.patch vendored
View File

@ -1,7 +1,7 @@
From: Clark Williams <williams@redhat.com>
Date: Tue, 26 May 2015 10:43:43 -0500
Subject: i915: bogus warning from i915 when running on PREEMPT_RT
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
The i915 driver has a 'WARN_ON(!in_interrupt())' in the display
handler, which whines constanly on the RT kernel (since the interrupt

2
debian/patches/features/all/rt/i915_compile_fix.patch vendored
View File

@ -1,7 +1,7 @@
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Tue, 14 Jul 2015 14:26:34 +0200
Subject: gpu/i915: don't open code these things
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
The opencode part is gone in 1f83fee0 ("drm/i915: clear up wedged transitions")
the owner check is still there.

2
debian/patches/features/all/rt/ide-use-nort-local-irq-variants.patch vendored
View File

@ -1,7 +1,7 @@
From: Ingo Molnar <mingo@elte.hu>
Date: Fri, 3 Jul 2009 08:30:16 -0500
Subject: ide: Do not disable interrupts for PREEMPT-RT
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Use the local_irq_*_nort variants.

2
debian/patches/features/all/rt/idr-use-local-lock-for-protection.patch vendored
View File

@ -1,7 +1,7 @@
From: Thomas Gleixner <tglx@linutronix.de>
Date: Tue, 14 Jul 2015 14:26:34 +0200
Subject: idr: Use local lock instead of preempt enable/disable
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
We need to protect the per cpu variable and prevent migration.

2
debian/patches/features/all/rt/infiniband-mellanox-ib-use-nort-irq.patch vendored
View File

@ -1,7 +1,7 @@
From: Sven-Thorsten Dietrich <sdietrich@novell.com>
Date: Fri, 3 Jul 2009 08:30:35 -0500
Subject: infiniband: Mellanox IB driver patch use _nort() primitives
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Fixes in_atomic stack-dump, when Mellanox module is loaded into the RT
Kernel.

2
debian/patches/features/all/rt/inpt-gameport-use-local-irq-nort.patch vendored
View File

@ -1,7 +1,7 @@
From: Ingo Molnar <mingo@elte.hu>
Date: Fri, 3 Jul 2009 08:30:16 -0500
Subject: input: gameport: Do not disable interrupts on PREEMPT_RT
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Use the _nort() primitives.

135
debian/patches/features/all/rt/introduce_migrate_disable_cpu_light.patch vendored
View File

@ -1,7 +1,7 @@
Subject: Intrduce migrate_disable() + cpu_light()
From: Thomas Gleixner <tglx@linutronix.de>
Date: Fri, 17 Jun 2011 15:42:38 +0200
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Introduce migrate_disable(). The task can't be pushed to another CPU but can
be preempted.
@ -31,14 +31,14 @@ invoked again from another caller on the same CPU.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
include/linux/cpu.h | 3 +
include/linux/preempt.h | 9 +++
include/linux/sched.h | 29 +++++++++-
include/linux/smp.h | 3 +
kernel/sched/core.c | 132 +++++++++++++++++++++++++++++++++++++++++++++++-
kernel/sched/debug.c | 7 ++
lib/smp_processor_id.c | 5 +
7 files changed, 182 insertions(+), 6 deletions(-)
include/linux/cpu.h | 3 ++
include/linux/preempt.h | 9 ++++++
include/linux/sched.h | 39 ++++++++++++++++++++------
include/linux/smp.h | 3 ++
kernel/sched/core.c | 71 +++++++++++++++++++++++++++++++++++++++++++++++-
kernel/sched/debug.c | 7 ++++
lib/smp_processor_id.c | 5 ++-
7 files changed, 126 insertions(+), 11 deletions(-)
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@ -90,17 +90,22 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
int nr_cpus_allowed;
cpumask_t cpus_allowed;
@@ -1837,9 +1843,6 @@ extern int arch_task_struct_size __read_
@@ -1837,14 +1843,6 @@ extern int arch_task_struct_size __read_
# define arch_task_struct_size (sizeof(struct task_struct))
#endif
-/* Future-safe accessor for struct task_struct's cpus_allowed. */
-#define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
-
-static inline int tsk_nr_cpus_allowed(struct task_struct *p)
-{
- return p->nr_cpus_allowed;
-}
-
#define TNF_MIGRATED 0x01
#define TNF_NO_GROUP 0x02
#define TNF_SHARED 0x04
@@ -3116,6 +3119,26 @@ static inline void set_task_cpu(struct t
@@ -3121,6 +3119,31 @@ static inline void set_task_cpu(struct t
#endif /* CONFIG_SMP */
@ -116,13 +121,18 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
+/* Future-safe accessor for struct task_struct's cpus_allowed. */
+static inline const struct cpumask *tsk_cpus_allowed(struct task_struct *p)
+{
+#ifdef CONFIG_PREEMPT_RT_FULL
+ if (p->migrate_disable)
+ if (__migrate_disabled(p))
+ return cpumask_of(task_cpu(p));
+#endif
+
+ return &p->cpus_allowed;
+}
+
+static inline int tsk_nr_cpus_allowed(struct task_struct *p)
+{
+ if (__migrate_disabled(p))
+ return 1;
+ return p->nr_cpus_allowed;
+}
+
extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
@ -141,27 +151,11 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* boot command line:
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1164,6 +1164,15 @@ void set_cpus_allowed_common(struct task
p->nr_cpus_allowed = cpumask_weight(new_mask);
}
+#if defined(CONFIG_PREEMPT_RT_FULL) && defined(CONFIG_SMP)
+#define MIGRATE_DISABLE_SET_AFFIN (1<<30) /* Can't make a negative */
+#define migrate_disabled_updated(p) ((p)->migrate_disable & MIGRATE_DISABLE_SET_AFFIN)
+#define migrate_disable_count(p) ((p)->migrate_disable & ~MIGRATE_DISABLE_SET_AFFIN)
+#else
+static inline void update_migrate_disable(struct task_struct *p) { }
+#define migrate_disabled_updated(p) 0
+#endif
+
void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask)
{
struct rq *rq = task_rq(p);
@@ -1171,6 +1180,11 @@ void do_set_cpus_allowed(struct task_str
@@ -1171,6 +1171,11 @@ void do_set_cpus_allowed(struct task_str
lockdep_assert_held(&p->pi_lock);
+ if (migrate_disabled_updated(p)) {
+ if (__migrate_disabled(p)) {
+ cpumask_copy(&p->cpus_allowed, new_mask);
+ return;
+ }
@ -169,7 +163,7 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
queued = task_on_rq_queued(p);
running = task_current(rq, p);
@@ -1232,7 +1246,7 @@ static int __set_cpus_allowed_ptr(struct
@@ -1232,7 +1237,7 @@ static int __set_cpus_allowed_ptr(struct
do_set_cpus_allowed(p, new_mask);
/* Can the task run on the task's current CPU? If so, we're done */
@ -178,44 +172,12 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
goto out;
dest_cpu = cpumask_any_and(cpu_active_mask, new_mask);
@@ -3022,6 +3036,120 @@ static inline void schedule_debug(struct
@@ -3022,6 +3027,70 @@ static inline void schedule_debug(struct
schedstat_inc(this_rq(), sched_count);
}
+#if defined(CONFIG_PREEMPT_RT_FULL) && defined(CONFIG_SMP)
+
+static inline void update_migrate_disable(struct task_struct *p)
+{
+ const struct cpumask *mask;
+
+ if (likely(!p->migrate_disable))
+ return;
+
+ /* Did we already update affinity? */
+ if (unlikely(migrate_disabled_updated(p)))
+ return;
+
+ /*
+ * Since this is always current we can get away with only locking
+ * rq->lock, the ->cpus_allowed value can normally only be changed
+ * while holding both p->pi_lock and rq->lock, but seeing that this
+ * is current, we cannot actually be waking up, so all code that
+ * relies on serialization against p->pi_lock is out of scope.
+ *
+ * Having rq->lock serializes us against things like
+ * set_cpus_allowed_ptr() that can still happen concurrently.
+ */
+ mask = tsk_cpus_allowed(p);
+
+ if (p->sched_class->set_cpus_allowed)
+ p->sched_class->set_cpus_allowed(p, mask);
+ /* mask==cpumask_of(task_cpu(p)) which has a cpumask_weight==1 */
+ p->nr_cpus_allowed = 1;
+
+ /* Let migrate_enable know to fix things back up */
+ p->migrate_disable |= MIGRATE_DISABLE_SET_AFFIN;
+}
+
+void migrate_disable(void)
+{
+ struct task_struct *p = current;
@ -239,6 +201,7 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
+ preempt_disable();
+ pin_current_cpu();
+ p->migrate_disable = 1;
+ p->nr_cpus_allowed = 1;
+ preempt_enable();
+}
+EXPORT_SYMBOL(migrate_disable);
@ -246,9 +209,6 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
+void migrate_enable(void)
+{
+ struct task_struct *p = current;
+ const struct cpumask *mask;
+ unsigned long flags;
+ struct rq *rq;
+
+ if (in_atomic() || p->flags & PF_NO_SETAFFINITY) {
+#ifdef CONFIG_SCHED_DEBUG
@ -262,33 +222,17 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
+#endif
+ WARN_ON_ONCE(p->migrate_disable <= 0);
+
+ if (migrate_disable_count(p) > 1) {
+ if (p->migrate_disable > 1) {
+ p->migrate_disable--;
+ return;
+ }
+
+ preempt_disable();
+ if (unlikely(migrate_disabled_updated(p))) {
+ /*
+ * Undo whatever update_migrate_disable() did, also see there
+ * about locking.
+ */
+ rq = this_rq();
+ raw_spin_lock_irqsave(&current->pi_lock, flags);
+ raw_spin_lock(&rq->lock);
+
+ /*
+ * Clearing migrate_disable causes tsk_cpus_allowed to
+ * show the tasks original cpu affinity.
+ */
+ p->migrate_disable = 0;
+ mask = tsk_cpus_allowed(p);
+ do_set_cpus_allowed(p, mask);
+
+ raw_spin_unlock(&rq->lock);
+ raw_spin_unlock_irqrestore(&current->pi_lock, flags);
+ } else
+ p->migrate_disable = 0;
+ /*
+ * Clearing migrate_disable causes tsk_cpus_allowed to
+ * show the tasks original cpu affinity.
+ */
+ p->migrate_disable = 0;
+
+ unpin_current_cpu();
+ preempt_enable();
@ -299,15 +243,6 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
/*
* Pick up the highest-prio task:
*/
@@ -3137,6 +3265,8 @@ static void __sched notrace __schedule(b
raw_spin_lock_irq(&rq->lock);
lockdep_pin_lock(&rq->lock);
+ update_migrate_disable(prev);
+
rq->clock_skip_update <<= 1; /* promote REQ to ACT */
switch_count = &prev->nivcsw;
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -251,6 +251,9 @@ void print_rt_rq(struct seq_file *m, int

5
debian/patches/features/all/rt/ipc-msg-Implement-lockless-pipelined-wakeups.patch vendored
View File

@ -1,8 +1,7 @@
From 9a69dce752915917ecfe06a21f9c826c76f6eb07 Mon Sep 17 00:00:00 2001
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Fri, 30 Oct 2015 11:59:07 +0100
Subject: [PATCH] ipc/msg: Implement lockless pipelined wakeups
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Subject: ipc/msg: Implement lockless pipelined wakeups
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
This patch moves the wakeup_process() invocation so it is not done under
the perm->lock by making use of a lockless wake_q. With this change, the

2
debian/patches/features/all/rt/ipc-sem-rework-semaphore-wakeups.patch vendored
View File

@ -1,7 +1,7 @@
Subject: ipc/sem: Rework semaphore wakeups
From: Peter Zijlstra <peterz@infradead.org>
Date: Wed, 14 Sep 2011 11:57:04 +0200
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Current sysv sems have a weird ass wakeup scheme that involves keeping
preemption disabled over a potential O(n^2) loop and busy waiting on

2
debian/patches/features/all/rt/irq-allow-disabling-of-softirq-processing-in-irq-thread-context.patch vendored
View File

@ -1,7 +1,7 @@
Subject: genirq: Allow disabling of softirq processing in irq thread context
From: Thomas Gleixner <tglx@linutronix.de>
Date: Tue, 31 Jan 2012 13:01:27 +0100
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
The processing of softirqs in irq thread context is a performance gain
for the non-rt workloads of a system, but it's counterproductive for

2
debian/patches/features/all/rt/irqwork-Move-irq-safe-work-to-irq-context.patch vendored
View File

@ -1,7 +1,7 @@
Subject: irqwork: Move irq safe work to irq context
From: Thomas Gleixner <tglx@linutronix.de>
Date: Sun, 15 Nov 2015 18:40:17 +0100
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
On architectures where arch_irq_work_has_interrupt() returns false, we
end up running the irq safe work from the softirq context. That

2
debian/patches/features/all/rt/irqwork-push_most_work_into_softirq_context.patch vendored
View File

@ -1,7 +1,7 @@
Subject: irqwork: push most work into softirq context
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Tue, 23 Jun 2015 15:32:51 +0200
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Initially we defered all irqwork into softirq because we didn't want the
latency spikes if perf or another user was busy and delayed the RT task.

2
debian/patches/features/all/rt/jump-label-rt.patch vendored
View File

@ -1,7 +1,7 @@
Subject: jump-label: disable if stop_machine() is used
From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 08 Jul 2015 17:14:48 +0200
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Some architectures are using stop_machine() while switching the opcode which
leads to latency spikes.

2
debian/patches/features/all/rt/kconfig-disable-a-few-options-rt.patch vendored
View File

@ -1,7 +1,7 @@
Subject: kconfig: Disable config options which are not RT compatible
From: Thomas Gleixner <tglx@linutronix.de>
Date: Sun, 24 Jul 2011 12:11:43 +0200
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Disable stuff which is known to have issues on RT

2
debian/patches/features/all/rt/kconfig-preempt-rt-full.patch vendored
View File

@ -1,7 +1,7 @@
Subject: kconfig: Add PREEMPT_RT_FULL
From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 29 Jun 2011 14:58:57 +0200
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
Introduce the final symbol for PREEMPT_RT_FULL.

4
debian/patches/features/all/rt/kernel-SRCU-provide-a-static-initializer.patch vendored
View File

@ -1,7 +1,7 @@
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Tue, 19 Mar 2013 14:44:30 +0100
Subject: [PATCH] kernel/SRCU: provide a static initializer
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Subject: kernel/SRCU: provide a static initializer
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
There are macros for static initializer for the three out of four
possible notifier types, that are:

2
debian/patches/features/all/rt/kernel-cpu-fix-cpu-down-problem-if-kthread-s-cpu-is-.patch vendored
View File

@ -1,7 +1,7 @@
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Fri, 7 Jun 2013 22:37:06 +0200
Subject: kernel/cpu: fix cpu down problem if kthread's cpu is going down
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt2.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rt3.tar.xz
If kthread is pinned to CPUx and CPUx is going down then we get into
trouble:

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