333 lines
11 KiB
Diff
333 lines
11 KiB
Diff
Subject: mm: pagefault_disabled()
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From: Peter Zijlstra <a.p.zijlstra@chello.nl>
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Date: Thu Aug 11 15:31:31 CEST 2011
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/3.14/patches-3.14.10-rt7.tar.xz
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Wrap the test for pagefault_disabled() into a helper, this allows us
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to remove the need for current->pagefault_disabled on !-rt kernels.
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Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
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Link: http://lkml.kernel.org/n/tip-3yy517m8zsi9fpsf14xfaqkw@git.kernel.org
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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 | 4 ++--
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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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include/linux/sched.h | 14 ++++++++++++++
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kernel/fork.c | 2 ++
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24 files changed, 39 insertions(+), 24 deletions(-)
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--- a/arch/alpha/mm/fault.c
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+++ b/arch/alpha/mm/fault.c
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@@ -107,7 +107,7 @@ 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() || current->pagefault_disabled)
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+ if (!mm || pagefault_disabled())
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goto no_context;
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#ifdef CONFIG_ALPHA_LARGE_VMALLOC
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--- a/arch/arm/mm/fault.c
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+++ b/arch/arm/mm/fault.c
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@@ -277,7 +277,7 @@ 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 || current->pagefault_disabled)
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+ if (!mm || pagefault_disabled())
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goto no_context;
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if (user_mode(regs))
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--- a/arch/avr32/mm/fault.c
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+++ b/arch/avr32/mm/fault.c
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@@ -81,8 +81,7 @@ 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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- current->pagefault_disabled)
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+ if (!mm || regs->sr & SYSREG_BIT(GM) || pagefault_disabled())
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goto no_context;
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local_irq_enable();
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--- a/arch/cris/mm/fault.c
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+++ b/arch/cris/mm/fault.c
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@@ -113,7 +113,7 @@ 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 || current->pagefault_disabled)
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+ if (!mm || pagefault_disabled())
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goto no_context;
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if (user_mode(regs))
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--- a/arch/frv/mm/fault.c
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+++ b/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 || current->pagefault_disabled)
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+ if (!mm || pagefault_disabled())
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goto no_context;
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if (user_mode(__frame))
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--- a/arch/ia64/mm/fault.c
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+++ b/arch/ia64/mm/fault.c
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@@ -96,7 +96,7 @@ 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 || current->pagefault_disabled)
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+ if (!mm || pagefault_disabled())
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goto no_context;
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#ifdef CONFIG_VIRTUAL_MEM_MAP
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--- a/arch/m32r/mm/fault.c
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+++ b/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 || current->pagefault_disabled
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+ if (!mm || pagefault_disabled())
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goto bad_area_nosemaphore;
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if (error_code & ACE_USERMODE)
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--- a/arch/m68k/mm/fault.c
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+++ b/arch/m68k/mm/fault.c
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@@ -81,7 +81,7 @@ 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 || current->pagefault_disabled)
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+ if (!mm || pagefault_disabled())
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goto no_context;
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if (user_mode(regs))
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--- a/arch/microblaze/mm/fault.c
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+++ b/arch/microblaze/mm/fault.c
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@@ -107,7 +107,7 @@ 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 || current->pagefault_disabled)) {
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+ if (unlikely(!mm || pagefault_disabled())) {
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if (kernel_mode(regs))
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goto bad_area_nosemaphore;
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--- a/arch/mips/mm/fault.c
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+++ b/arch/mips/mm/fault.c
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@@ -89,7 +89,7 @@ static void __kprobes __do_page_fault(st
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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 || current->pagefault_disabled)
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+ if (!mm || pagefault_disabled())
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goto bad_area_nosemaphore;
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if (user_mode(regs))
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--- a/arch/mn10300/mm/fault.c
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+++ b/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 || current->pagefault_disabled)
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+ if (!mm || pagefault_disabled())
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goto no_context;
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if ((fault_code & MMUFCR_xFC_ACCESS) == MMUFCR_xFC_ACCESS_USR)
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--- a/arch/parisc/mm/fault.c
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+++ b/arch/parisc/mm/fault.c
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@@ -183,7 +183,7 @@ void do_page_fault(struct pt_regs *regs,
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int fault;
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unsigned int flags;
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- if (in_atomic() || current->pagefault_disabled)
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+ if (pagefault_disabled())
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goto no_context;
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tsk = current;
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--- a/arch/powerpc/mm/fault.c
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+++ b/arch/powerpc/mm/fault.c
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@@ -261,7 +261,7 @@ 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 || current->pagefault_disabled) {
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+ if (in_atomic() || mm == NULL || 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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--- a/arch/s390/mm/fault.c
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+++ b/arch/s390/mm/fault.c
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@@ -291,8 +291,8 @@ 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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- tsk->pagefault_disabled))
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+ if (unlikely(!user_space_fault(trans_exc_code) ||
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+ !mm || pagefault_disabled()))
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goto out;
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address = trans_exc_code & __FAIL_ADDR_MASK;
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--- a/arch/score/mm/fault.c
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+++ b/arch/score/mm/fault.c
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@@ -73,7 +73,7 @@ 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 || current->pagefault_disabled)
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+ if (!mm || pagefault_disabled())
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goto bad_area_nosemaphore;
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if (user_mode(regs))
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--- a/arch/sh/mm/fault.c
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+++ b/arch/sh/mm/fault.c
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@@ -438,7 +438,7 @@ 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 || current->pagefault_disabled)) {
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+ if (unlikely(!mm || 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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--- a/arch/sparc/mm/fault_32.c
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+++ b/arch/sparc/mm/fault_32.c
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@@ -199,7 +199,7 @@ 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 || current->pagefault_disabled)
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+ if (!mm || 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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--- a/arch/sparc/mm/fault_64.c
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+++ b/arch/sparc/mm/fault_64.c
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@@ -324,7 +324,7 @@ 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 || current->pagefault_enabled)
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+ if (!mm || pagefault_disabled())
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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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--- a/arch/tile/mm/fault.c
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+++ b/arch/tile/mm/fault.c
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@@ -357,7 +357,7 @@ 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 || current->pagefault_disabled) {
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+ if (!mm || 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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--- a/arch/um/kernel/trap.c
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+++ b/arch/um/kernel/trap.c
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@@ -38,7 +38,7 @@ 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() || current->pagefault_disabled)
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+ if (pagefault_disabled())
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goto out_nosemaphore;
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if (is_user)
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--- a/arch/x86/mm/fault.c
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+++ b/arch/x86/mm/fault.c
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@@ -1103,7 +1103,7 @@ static void __kprobes noinline
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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 || current->pagefault_disabled)) {
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+ if (unlikely(!mm || 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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--- a/arch/xtensa/mm/fault.c
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+++ b/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 || current->pagefault_disabled) {
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+ if (!mm || 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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--- a/include/linux/sched.h
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+++ b/include/linux/sched.h
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@@ -54,6 +54,7 @@ struct sched_param {
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#include <linux/llist.h>
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#include <linux/uidgid.h>
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#include <linux/gfp.h>
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+#include <linux/hardirq.h>
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#include <asm/processor.h>
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@@ -1388,7 +1389,9 @@ struct task_struct {
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/* mutex deadlock detection */
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struct mutex_waiter *blocked_on;
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#endif
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+#ifdef CONFIG_PREEMPT_RT_FULL
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int pagefault_disabled;
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+#endif
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#ifdef CONFIG_TRACE_IRQFLAGS
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unsigned int irq_events;
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unsigned long hardirq_enable_ip;
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@@ -1622,6 +1625,17 @@ static inline void task_numa_free(struct
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}
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#endif
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+#ifdef CONFIG_PREEMPT_RT_FULL
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+static inline bool cur_pf_disabled(void) { return current->pagefault_disabled; }
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+#else
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+static inline bool cur_pf_disabled(void) { return false; }
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+#endif
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+
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+static inline bool pagefault_disabled(void)
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+{
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+ return in_atomic() || cur_pf_disabled();
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+}
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+
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static inline struct pid *task_pid(struct task_struct *task)
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{
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return task->pids[PIDTYPE_PID].pid;
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--- a/kernel/fork.c
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+++ b/kernel/fork.c
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@@ -1298,7 +1298,9 @@ static struct task_struct *copy_process(
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p->hardirq_context = 0;
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p->softirq_context = 0;
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#endif
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+#ifdef CONFIG_PREEMPT_RT_FULL
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p->pagefault_disabled = 0;
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+#endif
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#ifdef CONFIG_LOCKDEP
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p->lockdep_depth = 0; /* no locks held yet */
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p->curr_chain_key = 0;
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