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[rt] update to 4.4.2-rt6

This commit is contained in:
Uwe Kleine-König 2016-02-16 14:23:21 +01:00
parent b01f6d01fe
commit 91d4b94303
282 changed files with 1884 additions and 383 deletions
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3
debian/changelog vendored
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@ -29,6 +29,9 @@ linux (4.4.1-1) UNRELEASED; urgency=medium
[ Roger Shimizu ]
* Enable TTY_PRINTK as module (Closes: #814540).
[ Uwe Kleine-König ]
* [rt] Update to 4.4.1-rt6
-- Ben Hutchings <ben@decadent.org.uk> Fri, 12 Feb 2016 23:34:23 +0000
linux (4.4.1-1~exp1) experimental; urgency=medium

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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.tar.xz
In exit_pi_state_list() we have the following locking construct:

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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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.

59
debian/patches/features/all/rt/KVM-arm-arm64-downgrade-preempt_disable-d-region-to-.patch vendored Normal file
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@ -0,0 +1,59 @@
From bdf6fc2d467f0db2122b1010106542dbc7a8398c Mon Sep 17 00:00:00 2001
From: Josh Cartwright <joshc@ni.com>
Date: Thu, 11 Feb 2016 11:54:01 -0600
Subject: [PATCH 2/2] KVM: arm/arm64: downgrade preempt_disable()d region to
migrate_disable()
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.tar.xz
kvm_arch_vcpu_ioctl_run() disables the use of preemption when updating
the vgic and timer states to prevent the calling task from migrating to
another CPU. It does so to prevent the task from writing to the
incorrect per-CPU GIC distributor registers.
On -rt kernels, it's possible to maintain the same guarantee with the
use of migrate_{disable,enable}(), with the added benefit that the
migrate-disabled region is preemptible. Update
kvm_arch_vcpu_ioctl_run() to do so.
Cc: Christoffer Dall <christoffer.dall@linaro.org>
Reported-by: Manish Jaggi <Manish.Jaggi@caviumnetworks.com>
Signed-off-by: Josh Cartwright <joshc@ni.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
arch/arm/kvm/arm.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
index 4f5c42a0924c..2ce9cc2717ac 100644
--- a/arch/arm/kvm/arm.c
+++ b/arch/arm/kvm/arm.c
@@ -568,7 +568,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
* involves poking the GIC, which must be done in a
* non-preemptible context.
*/
- preempt_disable();
+ migrate_disable();
kvm_timer_flush_hwstate(vcpu);
kvm_vgic_flush_hwstate(vcpu);
@@ -587,7 +587,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
local_irq_enable();
kvm_timer_sync_hwstate(vcpu);
kvm_vgic_sync_hwstate(vcpu);
- preempt_enable();
+ migrate_enable();
continue;
}
@@ -641,7 +641,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
kvm_vgic_sync_hwstate(vcpu);
- preempt_enable();
+ migrate_enable();
ret = handle_exit(vcpu, run, ret);
}
--
2.7.0

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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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,

2
debian/patches/features/all/rt/arm-arm64-lazy-preempt-add-TIF_NEED_RESCHED_LAZY-to-.patch vendored
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@ -1,7 +1,7 @@
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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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.

2
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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.tar.xz
Setup and remove the interrupt handler in clock event mode selection.
This avoids calling the (shared) interrupt handler when the device is

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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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.

2
debian/patches/features/all/rt/arm-enable-highmem-for-rt.patch vendored
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@ -1,7 +1,7 @@
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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.tar.xz
fixup highmem for ARM.

2
debian/patches/features/all/rt/arm-highmem-flush-tlb-on-unmap.patch vendored
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.tar.xz
Implement the arm pieces for lazy preempt.

2
debian/patches/features/all/rt/arm-unwind-use_raw_lock.patch vendored
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.tar.xz
Mostly unwind is done with irqs enabled however SLUB may call it with
irqs disabled while creating a new SLUB cache.

94
debian/patches/features/all/rt/arm64-replace-read_lock-to-rcu-lock-in-call_step_hoo.patch vendored Normal file
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@ -0,0 +1,94 @@
From: Yang Shi <yang.shi@linaro.org>
Date: Mon, 8 Feb 2016 14:49:24 -0800
Subject: arm64: replace read_lock to rcu lock in call_step_hook
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.tar.xz
BUG: sleeping function called from invalid context at kernel/locking/rtmutex.c:917
in_atomic(): 1, irqs_disabled(): 128, pid: 383, name: sh
Preemption disabled at:[<ffff800000124c18>] kgdb_cpu_enter+0x158/0x6b8
CPU: 3 PID: 383 Comm: sh Tainted: G W 4.1.13-rt13 #2
Hardware name: Freescale Layerscape 2085a RDB Board (DT)
Call trace:
[<ffff8000000885e8>] dump_backtrace+0x0/0x128
[<ffff800000088734>] show_stack+0x24/0x30
[<ffff80000079a7c4>] dump_stack+0x80/0xa0
[<ffff8000000bd324>] ___might_sleep+0x18c/0x1a0
[<ffff8000007a20ac>] __rt_spin_lock+0x2c/0x40
[<ffff8000007a2268>] rt_read_lock+0x40/0x58
[<ffff800000085328>] single_step_handler+0x38/0xd8
[<ffff800000082368>] do_debug_exception+0x58/0xb8
Exception stack(0xffff80834a1e7c80 to 0xffff80834a1e7da0)
7c80: ffffff9c ffffffff 92c23ba0 0000ffff 4a1e7e40 ffff8083 001bfcc4 ffff8000
7ca0: f2000400 00000000 00000000 00000000 4a1e7d80 ffff8083 0049501c ffff8000
7cc0: 00005402 00000000 00aaa210 ffff8000 4a1e7ea0 ffff8083 000833f4 ffff8000
7ce0: ffffff9c ffffffff 92c23ba0 0000ffff 4a1e7ea0 ffff8083 001bfcc0 ffff8000
7d00: 4a0fc400 ffff8083 00005402 00000000 4a1e7d40 ffff8083 00490324 ffff8000
7d20: ffffff9c 00000000 92c23ba0 0000ffff 000a0000 00000000 00000000 00000000
7d40: 00000008 00000000 00080000 00000000 92c23b8b 0000ffff 92c23b8e 0000ffff
7d60: 00000038 00000000 00001cb2 00000000 00000005 00000000 92d7b498 0000ffff
7d80: 01010101 01010101 92be9000 0000ffff 00000000 00000000 00000030 00000000
[<ffff8000000833f4>] el1_dbg+0x18/0x6c
This issue is similar with 62c6c61("arm64: replace read_lock to rcu lock in
call_break_hook"), but comes to single_step_handler.
This also solves kgdbts boot test silent hang issue on 4.4 -rt kernel.
Cc: stable-rt@vger.kernel.org
Signed-off-by: Yang Shi <yang.shi@linaro.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
arch/arm64/kernel/debug-monitors.c | 21 +++++++++++----------
1 file changed, 11 insertions(+), 10 deletions(-)
--- a/arch/arm64/kernel/debug-monitors.c
+++ b/arch/arm64/kernel/debug-monitors.c
@@ -186,20 +186,21 @@ static void clear_regs_spsr_ss(struct pt
/* EL1 Single Step Handler hooks */
static LIST_HEAD(step_hook);
-static DEFINE_RWLOCK(step_hook_lock);
+static DEFINE_SPINLOCK(step_hook_lock);
void register_step_hook(struct step_hook *hook)
{
- write_lock(&step_hook_lock);
- list_add(&hook->node, &step_hook);
- write_unlock(&step_hook_lock);
+ spin_lock(&step_hook_lock);
+ list_add_rcu(&hook->node, &step_hook);
+ spin_unlock(&step_hook_lock);
}
void unregister_step_hook(struct step_hook *hook)
{
- write_lock(&step_hook_lock);
- list_del(&hook->node);
- write_unlock(&step_hook_lock);
+ spin_lock(&step_hook_lock);
+ list_del_rcu(&hook->node);
+ spin_unlock(&step_hook_lock);
+ synchronize_rcu();
}
/*
@@ -213,15 +214,15 @@ static int call_step_hook(struct pt_regs
struct step_hook *hook;
int retval = DBG_HOOK_ERROR;
- read_lock(&step_hook_lock);
+ rcu_read_lock();
- list_for_each_entry(hook, &step_hook, node) {
+ list_for_each_entry_rcu(hook, &step_hook, node) {
retval = hook->fn(regs, esr);
if (retval == DBG_HOOK_HANDLED)
break;
}
- read_unlock(&step_hook_lock);
+ rcu_read_unlock();
return retval;
}

2
debian/patches/features/all/rt/arm64-xen--Make-XEN-depend-on-non-rt.patch vendored
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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

2
debian/patches/features/all/rt/btrfs-initialize-the-seq-counter-in-struct-btrfs_dev.patch vendored
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@ -1,7 +1,7 @@
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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.tar.xz
I managed to trigger this:
| INFO: trying to register non-static key.

2
debian/patches/features/all/rt/bug-rt-dependend-variants.patch vendored
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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.

2
debian/patches/features/all/rt/completion-use-simple-wait-queues.patch vendored
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.tar.xz
Completions have no long lasting callbacks and therefor do not need
the complex waitqueue variant. Use simple waitqueues which reduces the

2
debian/patches/features/all/rt/cond-resched-lock-rt-tweak.patch vendored
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.tar.xz
RT does not increment preempt count when a 'sleeping' spinlock is
locked. Update PREEMPT_LOCK_OFFSET for that case.

2
debian/patches/features/all/rt/cond-resched-softirq-rt.patch vendored
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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

2
debian/patches/features/all/rt/cpu-hotplug-Document-why-PREEMPT_RT-uses-a-spinlock.patch vendored
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.tar.xz
The patch:

2
debian/patches/features/all/rt/cpu-rt-make-hotplug-lock-a-sleeping-spinlock-on-rt.patch vendored
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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

2
debian/patches/features/all/rt/cpu-rt-rework-cpu-down.patch vendored
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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

2
debian/patches/features/all/rt/cpu_chill-Add-a-UNINTERRUPTIBLE-hrtimer_nanosleep.patch vendored
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.tar.xz
We hit another bug that was caused by switching cpu_chill() from
msleep() to hrtimer_nanosleep().

2
debian/patches/features/all/rt/cpu_down_move_migrate_enable_back.patch vendored
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.tar.xz
Ralf posted a picture of a backtrace from

2
debian/patches/features/all/rt/cpumask-disable-offstack-on-rt.patch vendored
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.tar.xz
Avoid filling the pool / allocating memory with irqs off().

2
debian/patches/features/all/rt/dm-make-rt-aware.patch vendored
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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

2
debian/patches/features/all/rt/drivers-cpuidle-coupled-fix-warning-cpuidle_coupled_.patch vendored
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@ -1,7 +1,7 @@
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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.tar.xz
Used multi_v7_defconfig+PREEMPT_RT_FULL=y and this caused a compilation
warning without this fix:

2
debian/patches/features/all/rt/drivers-media-vsp1_video-fix-compile-error.patch vendored
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@ -1,7 +1,7 @@
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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.tar.xz
This was found with the -RT patch enabled, but the fix should apply to
non-RT also.

2
debian/patches/features/all/rt/drivers-net-8139-disable-irq-nosync.patch vendored
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.tar.xz
Argh, cut and paste wasn't enough...

2
debian/patches/features/all/rt/drivers-random-reduce-preempt-disabled-region.patch vendored
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.tar.xz
This tracepoint is responsible for:

2
debian/patches/features/all/rt/dump-stack-don-t-disable-preemption-during-trace.patch vendored
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.tar.xz
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---

12
debian/patches/features/all/rt/futex-requeue-pi-fix.patch vendored
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@ -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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.tar.xz
Requeue with timeout causes a bug with PREEMPT_RT_FULL.
@ -66,7 +66,7 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
}
/*
@@ -1631,6 +1632,35 @@ int rt_mutex_start_proxy_lock(struct rt_
@@ -1640,6 +1641,35 @@ int rt_mutex_start_proxy_lock(struct rt_
return 1;
}
@ -89,14 +89,14 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
+ * PI_REQUEUE_INPROGRESS, so that if the task is waking up
+ * it will know that we are in the process of requeuing it.
+ */
+ raw_spin_lock_irq(&task->pi_lock);
+ raw_spin_lock(&task->pi_lock);
+ if (task->pi_blocked_on) {
+ raw_spin_unlock_irq(&task->pi_lock);
+ raw_spin_unlock(&lock->wait_lock);
+ raw_spin_unlock(&task->pi_lock);
+ raw_spin_unlock_irq(&lock->wait_lock);
+ return -EAGAIN;
+ }
+ task->pi_blocked_on = PI_REQUEUE_INPROGRESS;
+ raw_spin_unlock_irq(&task->pi_lock);
+ raw_spin_unlock(&task->pi_lock);
+#endif
+
/* We enforce deadlock detection for futexes */

2
debian/patches/features/all/rt/genirq-Add-default-affinity-mask-command-line-option.patch vendored
View File

@ -1,7 +1,7 @@
From: Thomas Gleixner <tglx@linutronix.de>
Date: Fri, 25 May 2012 16:59:47 +0200
Subject: genirq: Add default affinity mask command line option
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.tar.xz
If we isolate CPUs, then we don't want random device interrupts on them. Even
w/o the user space irq balancer enabled we can end up with irqs on non boot

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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.tar.xz
Creates long latencies for no value

2
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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.tar.xz
Joe Korty reported, that __irq_set_affinity_locked() schedules a
workqueue while holding a rawlock which results in a might_sleep()

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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.tar.xz
Force threaded_irqs and optimize the code (force_irqthreads) in regard
to this.

32
debian/patches/features/all/rt/genirq-update-irq_set_irqchip_state-documentation.patch vendored Normal file
View File

@ -0,0 +1,32 @@
From 85b7f1606fb707c9da7984e052e47cfa12e85e67 Mon Sep 17 00:00:00 2001
From: Josh Cartwright <joshc@ni.com>
Date: Thu, 11 Feb 2016 11:54:00 -0600
Subject: [PATCH 1/2] genirq: update irq_set_irqchip_state documentation
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.tar.xz
On -rt kernels, the use of migrate_disable()/migrate_enable() is
sufficient to guarantee a task isn't moved to another CPU. Update the
irq_set_irqchip_state() documentation to reflect this.
Signed-off-by: Josh Cartwright <joshc@ni.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
kernel/irq/manage.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index ba2a42a37025..8e89554aa345 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -2060,7 +2060,7 @@ EXPORT_SYMBOL_GPL(irq_get_irqchip_state);
* This call sets the internal irqchip state of an interrupt,
* depending on the value of @which.
*
- * This function should be called with preemption disabled if the
+ * This function should be called with migration disabled if the
* interrupt controller has per-cpu registers.
*/
int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
--
2.7.0

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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.tar.xz
When run ltp leapsec_timer test, the following call trace is caught:

2
debian/patches/features/all/rt/hrtimer-enfore-64byte-alignment.patch vendored
View File

@ -1,7 +1,7 @@
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Wed, 23 Dec 2015 20:57:41 +0100
Subject: hrtimer: enfore 64byte alignment
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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

2
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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.tar.xz
In preempt-rt we can not call the callbacks which take sleeping locks
from the timer interrupt context.

2
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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.tar.xz
Make cancellation of a running callback in softirq context safe
against preemption.

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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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

2
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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.tar.xz
Jon Masters developed this wonderful SMI detector. For details please
consult Documentation/hwlat_detector.txt. It could be ported to Linux

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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.tar.xz
Use the _nort() primitives.

2
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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.tar.xz
Introduce migrate_disable(). The task can't be pushed to another CPU but can
be preempted.

2
debian/patches/features/all/rt/ipc-msg-Implement-lockless-pipelined-wakeups.patch vendored
View File

@ -1,7 +1,7 @@
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Fri, 30 Oct 2015 11:59:07 +0100
Subject: ipc/msg: Implement lockless pipelined wakeups
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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

4
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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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
@ -129,7 +129,7 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
return desc->status_use_accessors & _IRQ_PER_CPU;
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -576,6 +576,15 @@ void __local_bh_enable(void)
@@ -578,6 +578,15 @@ void __local_bh_enable(void)
}
EXPORT_SYMBOL(__local_bh_enable);

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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.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-4.4.1-rt5.tar.xz
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.1-rt6.tar.xz
Disable stuff which is known to have issues on RT

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