332 lines
12 KiB
Diff
332 lines
12 KiB
Diff
Subject: mm: Fixup all fault handlers to check current->pagefault_disable
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From: Thomas Gleixner <tglx@linutronix.de>
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Date: Thu, 17 Mar 2011 11:32:28 +0100
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/3.10/patches-3.10.4-rt1.tar.xz
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Necessary for decoupling pagefault disable from preempt count.
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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---
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arch/alpha/mm/fault.c | 2 +-
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arch/arm/mm/fault.c | 2 +-
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arch/avr32/mm/fault.c | 3 ++-
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arch/cris/mm/fault.c | 2 +-
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arch/frv/mm/fault.c | 2 +-
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arch/ia64/mm/fault.c | 2 +-
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arch/m32r/mm/fault.c | 2 +-
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arch/m68k/mm/fault.c | 2 +-
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arch/microblaze/mm/fault.c | 2 +-
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arch/mips/mm/fault.c | 2 +-
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arch/mn10300/mm/fault.c | 2 +-
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arch/parisc/mm/fault.c | 2 +-
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arch/powerpc/mm/fault.c | 2 +-
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arch/s390/mm/fault.c | 6 ++++--
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arch/score/mm/fault.c | 2 +-
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arch/sh/mm/fault.c | 2 +-
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arch/sparc/mm/fault_32.c | 2 +-
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arch/sparc/mm/fault_64.c | 2 +-
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arch/tile/mm/fault.c | 2 +-
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arch/um/kernel/trap.c | 2 +-
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arch/x86/mm/fault.c | 2 +-
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arch/xtensa/mm/fault.c | 2 +-
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22 files changed, 26 insertions(+), 23 deletions(-)
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Index: linux-stable/arch/alpha/mm/fault.c
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===================================================================
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--- linux-stable.orig/arch/alpha/mm/fault.c
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+++ linux-stable/arch/alpha/mm/fault.c
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@@ -108,7 +108,7 @@ do_page_fault(unsigned long address, uns
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/* If we're in an interrupt context, or have no user context,
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we must not take the fault. */
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- if (!mm || in_atomic())
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+ if (!mm || in_atomic() || current->pagefault_disabled)
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goto no_context;
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#ifdef CONFIG_ALPHA_LARGE_VMALLOC
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Index: linux-stable/arch/arm/mm/fault.c
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===================================================================
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--- linux-stable.orig/arch/arm/mm/fault.c
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+++ linux-stable/arch/arm/mm/fault.c
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@@ -279,7 +279,7 @@ do_page_fault(unsigned long addr, unsign
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* If we're in an interrupt or have no user
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* context, we must not take the fault..
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*/
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- if (in_atomic() || !mm)
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+ if (in_atomic() || !mm || current->pagefault_disabled)
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goto no_context;
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/*
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Index: linux-stable/arch/avr32/mm/fault.c
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===================================================================
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--- linux-stable.orig/arch/avr32/mm/fault.c
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+++ linux-stable/arch/avr32/mm/fault.c
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@@ -81,7 +81,8 @@ asmlinkage void do_page_fault(unsigned l
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* If we're in an interrupt or have no user context, we must
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* not take the fault...
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*/
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- if (in_atomic() || !mm || regs->sr & SYSREG_BIT(GM))
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+ if (in_atomic() || !mm || regs->sr & SYSREG_BIT(GM) ||
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+ current->pagefault_disabled)
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goto no_context;
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local_irq_enable();
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Index: linux-stable/arch/cris/mm/fault.c
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===================================================================
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--- linux-stable.orig/arch/cris/mm/fault.c
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+++ linux-stable/arch/cris/mm/fault.c
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@@ -114,7 +114,7 @@ do_page_fault(unsigned long address, str
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* user context, we must not take the fault.
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*/
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- if (in_atomic() || !mm)
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+ if (in_atomic() || !mm || current->pagefault_disabled)
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goto no_context;
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retry:
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Index: linux-stable/arch/frv/mm/fault.c
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===================================================================
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--- linux-stable.orig/arch/frv/mm/fault.c
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+++ linux-stable/arch/frv/mm/fault.c
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@@ -78,7 +78,7 @@ asmlinkage void do_page_fault(int datamm
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* If we're in an interrupt or have no user
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* context, we must not take the fault..
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*/
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- if (in_atomic() || !mm)
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+ if (in_atomic() || !mm || current->pagefault_disabled)
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goto no_context;
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down_read(&mm->mmap_sem);
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Index: linux-stable/arch/ia64/mm/fault.c
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===================================================================
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--- linux-stable.orig/arch/ia64/mm/fault.c
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+++ linux-stable/arch/ia64/mm/fault.c
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@@ -98,7 +98,7 @@ ia64_do_page_fault (unsigned long addres
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/*
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* If we're in an interrupt or have no user context, we must not take the fault..
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*/
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- if (in_atomic() || !mm)
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+ if (in_atomic() || !mm || current->pagefault_disabled)
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goto no_context;
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#ifdef CONFIG_VIRTUAL_MEM_MAP
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Index: linux-stable/arch/m32r/mm/fault.c
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===================================================================
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--- linux-stable.orig/arch/m32r/mm/fault.c
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+++ linux-stable/arch/m32r/mm/fault.c
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@@ -114,7 +114,7 @@ asmlinkage void do_page_fault(struct pt_
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* If we're in an interrupt or have no user context or are running in an
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* atomic region then we must not take the fault..
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*/
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- if (in_atomic() || !mm)
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+ if (in_atomic() || !mm || current->pagefault_disabled)
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goto bad_area_nosemaphore;
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/* When running in the kernel we expect faults to occur only to
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Index: linux-stable/arch/m68k/mm/fault.c
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===================================================================
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--- linux-stable.orig/arch/m68k/mm/fault.c
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+++ linux-stable/arch/m68k/mm/fault.c
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@@ -85,7 +85,7 @@ int do_page_fault(struct pt_regs *regs,
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* If we're in an interrupt or have no user
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* context, we must not take the fault..
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*/
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- if (in_atomic() || !mm)
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+ if (in_atomic() || !mm || current->pagefault_disabled)
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goto no_context;
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retry:
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Index: linux-stable/arch/microblaze/mm/fault.c
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===================================================================
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--- linux-stable.orig/arch/microblaze/mm/fault.c
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+++ linux-stable/arch/microblaze/mm/fault.c
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@@ -108,7 +108,7 @@ void do_page_fault(struct pt_regs *regs,
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if ((error_code & 0x13) == 0x13 || (error_code & 0x11) == 0x11)
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is_write = 0;
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- if (unlikely(in_atomic() || !mm)) {
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+ if (unlikely(in_atomic() || !mm || current->pagefault_disabled)) {
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if (kernel_mode(regs))
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goto bad_area_nosemaphore;
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Index: linux-stable/arch/mips/mm/fault.c
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===================================================================
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--- linux-stable.orig/arch/mips/mm/fault.c
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+++ linux-stable/arch/mips/mm/fault.c
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@@ -89,7 +89,7 @@ asmlinkage void __kprobes do_page_fault(
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* If we're in an interrupt or have no user
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* context, we must not take the fault..
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*/
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- if (in_atomic() || !mm)
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+ if (in_atomic() || !mm || current->pagefault_disabled)
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goto bad_area_nosemaphore;
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retry:
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Index: linux-stable/arch/mn10300/mm/fault.c
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===================================================================
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--- linux-stable.orig/arch/mn10300/mm/fault.c
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+++ linux-stable/arch/mn10300/mm/fault.c
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@@ -168,7 +168,7 @@ asmlinkage void do_page_fault(struct pt_
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* If we're in an interrupt or have no user
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* context, we must not take the fault..
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*/
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- if (in_atomic() || !mm)
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+ if (in_atomic() || !mm || current->pagefault_disabled)
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goto no_context;
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retry:
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Index: linux-stable/arch/parisc/mm/fault.c
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===================================================================
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--- linux-stable.orig/arch/parisc/mm/fault.c
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+++ linux-stable/arch/parisc/mm/fault.c
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@@ -177,7 +177,7 @@ void do_page_fault(struct pt_regs *regs,
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int fault;
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unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
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- if (in_atomic() || !mm)
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+ if (in_atomic() || !mm || current->pagefault_disabled)
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goto no_context;
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retry:
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Index: linux-stable/arch/powerpc/mm/fault.c
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===================================================================
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--- linux-stable.orig/arch/powerpc/mm/fault.c
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+++ linux-stable/arch/powerpc/mm/fault.c
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@@ -264,7 +264,7 @@ int __kprobes do_page_fault(struct pt_re
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if (!arch_irq_disabled_regs(regs))
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local_irq_enable();
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- if (in_atomic() || mm == NULL) {
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+ if (in_atomic() || mm == NULL || current->pagefault_disabled) {
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if (!user_mode(regs)) {
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rc = SIGSEGV;
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goto bail;
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Index: linux-stable/arch/s390/mm/fault.c
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===================================================================
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--- linux-stable.orig/arch/s390/mm/fault.c
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+++ linux-stable/arch/s390/mm/fault.c
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@@ -296,7 +296,8 @@ static inline int do_exception(struct pt
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* user context.
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*/
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fault = VM_FAULT_BADCONTEXT;
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- if (unlikely(!user_space_fault(trans_exc_code) || in_atomic() || !mm))
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+ if (unlikely(!user_space_fault(trans_exc_code) || in_atomic() || !mm ||
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+ tsk->pagefault_disabled))
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goto out;
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address = trans_exc_code & __FAIL_ADDR_MASK;
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@@ -440,7 +441,8 @@ void __kprobes do_asce_exception(struct
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clear_tsk_thread_flag(current, TIF_PER_TRAP);
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trans_exc_code = regs->int_parm_long;
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- if (unlikely(!user_space_fault(trans_exc_code) || in_atomic() || !mm))
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+ if (unlikely(!user_space_fault(trans_exc_code) || in_atomic() || !mm ||
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+ current->pagefault_disabled()));
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goto no_context;
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down_read(&mm->mmap_sem);
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Index: linux-stable/arch/score/mm/fault.c
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===================================================================
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--- linux-stable.orig/arch/score/mm/fault.c
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+++ linux-stable/arch/score/mm/fault.c
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@@ -72,7 +72,7 @@ asmlinkage void do_page_fault(struct pt_
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* If we're in an interrupt or have no user
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* context, we must not take the fault..
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*/
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- if (in_atomic() || !mm)
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+ if (in_atomic() || !mm || current->pagefault_disabled)
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goto bad_area_nosemaphore;
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down_read(&mm->mmap_sem);
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Index: linux-stable/arch/sh/mm/fault.c
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===================================================================
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--- linux-stable.orig/arch/sh/mm/fault.c
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+++ linux-stable/arch/sh/mm/fault.c
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@@ -440,7 +440,7 @@ asmlinkage void __kprobes do_page_fault(
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* If we're in an interrupt, have no user context or are running
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* in an atomic region then we must not take the fault:
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*/
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- if (unlikely(in_atomic() || !mm)) {
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+ if (unlikely(in_atomic() || !mm || current->pagefault_disabled)) {
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bad_area_nosemaphore(regs, error_code, address);
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return;
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}
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Index: linux-stable/arch/sparc/mm/fault_32.c
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===================================================================
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--- linux-stable.orig/arch/sparc/mm/fault_32.c
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+++ linux-stable/arch/sparc/mm/fault_32.c
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@@ -200,7 +200,7 @@ asmlinkage void do_sparc_fault(struct pt
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* If we're in an interrupt or have no user
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* context, we must not take the fault..
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*/
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- if (in_atomic() || !mm)
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+ if (in_atomic() || !mm || current->pagefault_disabled)
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goto no_context;
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perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);
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Index: linux-stable/arch/sparc/mm/fault_64.c
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===================================================================
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--- linux-stable.orig/arch/sparc/mm/fault_64.c
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+++ linux-stable/arch/sparc/mm/fault_64.c
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@@ -321,7 +321,7 @@ asmlinkage void __kprobes do_sparc64_fau
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* If we're in an interrupt or have no user
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* context, we must not take the fault..
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*/
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- if (in_atomic() || !mm)
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+ if (in_atomic() || !mm || current->pagefault_enabled)
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goto intr_or_no_mm;
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perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);
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Index: linux-stable/arch/tile/mm/fault.c
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===================================================================
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--- linux-stable.orig/arch/tile/mm/fault.c
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+++ linux-stable/arch/tile/mm/fault.c
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@@ -360,7 +360,7 @@ static int handle_page_fault(struct pt_r
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* If we're in an interrupt, have no user context or are running in an
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* atomic region then we must not take the fault.
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*/
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- if (in_atomic() || !mm) {
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+ if (in_atomic() || !mm || current->pagefault_disabled) {
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vma = NULL; /* happy compiler */
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goto bad_area_nosemaphore;
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}
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Index: linux-stable/arch/um/kernel/trap.c
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===================================================================
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--- linux-stable.orig/arch/um/kernel/trap.c
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+++ linux-stable/arch/um/kernel/trap.c
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@@ -39,7 +39,7 @@ int handle_page_fault(unsigned long addr
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* If the fault was during atomic operation, don't take the fault, just
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* fail.
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*/
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- if (in_atomic())
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+ if (in_atomic() || current->pagefault_disabled)
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goto out_nosemaphore;
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retry:
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Index: linux-stable/arch/x86/mm/fault.c
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===================================================================
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--- linux-stable.orig/arch/x86/mm/fault.c
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+++ linux-stable/arch/x86/mm/fault.c
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@@ -1104,7 +1104,7 @@ __do_page_fault(struct pt_regs *regs, un
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* If we're in an interrupt, have no user context or are running
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* in an atomic region then we must not take the fault:
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*/
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- if (unlikely(in_atomic() || !mm)) {
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+ if (unlikely(in_atomic() || !mm || current->pagefault_disabled)) {
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bad_area_nosemaphore(regs, error_code, address);
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return;
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}
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Index: linux-stable/arch/xtensa/mm/fault.c
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===================================================================
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--- linux-stable.orig/arch/xtensa/mm/fault.c
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+++ linux-stable/arch/xtensa/mm/fault.c
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@@ -57,7 +57,7 @@ void do_page_fault(struct pt_regs *regs)
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/* If we're in an interrupt or have no user
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* context, we must not take the fault..
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*/
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- if (in_atomic() || !mm) {
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+ if (in_atomic() || !mm || current->pagefault_disabled) {
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bad_page_fault(regs, address, SIGSEGV);
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return;
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}
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