From 71071437e3aefa9c4856805a157203d7b0ad5cc7 Mon Sep 17 00:00:00 2001 From: Harvey Harrison Date: Wed, 30 Jan 2008 13:33:12 +0100 Subject: [PATCH] --- yaml --- r: 80288 b: refs/heads/master c: 608566b4edda5079c7812c2108a89c0fcf2894bb h: refs/heads/master v: v3 --- [refs] | 2 +- trunk/arch/x86/mm/fault_32.c | 16 +++++++--------- trunk/arch/x86/mm/fault_64.c | 7 ++----- 3 files changed, 10 insertions(+), 15 deletions(-) diff --git a/[refs] b/[refs] index b4fe958e03ca..d6f033beb141 100644 --- a/[refs] +++ b/[refs] @@ -1,2 +1,2 @@ --- -refs/heads/master: f2857ce92023409df1544737d5b3499b4630a183 +refs/heads/master: 608566b4edda5079c7812c2108a89c0fcf2894bb diff --git a/trunk/arch/x86/mm/fault_32.c b/trunk/arch/x86/mm/fault_32.c index 36cb67e02b04..52c13d2e011e 100644 --- a/trunk/arch/x86/mm/fault_32.c +++ b/trunk/arch/x86/mm/fault_32.c @@ -295,13 +295,18 @@ void __kprobes do_page_fault(struct pt_regs *regs, unsigned long error_code) */ trace_hardirqs_fixup(); + tsk = current; + mm = tsk->mm; + prefetchw(&mm->mmap_sem); + /* get the address */ address = read_cr2(); - tsk = current; - si_code = SEGV_MAPERR; + if (notify_page_fault(regs)) + return; + /* * We fault-in kernel-space virtual memory on-demand. The * 'reference' page table is init_mm.pgd. @@ -319,8 +324,6 @@ void __kprobes do_page_fault(struct pt_regs *regs, unsigned long error_code) if (!(error_code & (PF_RSVD|PF_USER|PF_PROT)) && vmalloc_fault(address) >= 0) return; - if (notify_page_fault(regs)) - return; /* * Don't take the mm semaphore here. If we fixup a prefetch * fault we could otherwise deadlock. @@ -328,16 +331,11 @@ void __kprobes do_page_fault(struct pt_regs *regs, unsigned long error_code) goto bad_area_nosemaphore; } - if (notify_page_fault(regs)) - return; - /* It's safe to allow irq's after cr2 has been saved and the vmalloc fault has been handled. */ if (regs->flags & (X86_EFLAGS_IF|VM_MASK)) local_irq_enable(); - mm = tsk->mm; - /* * If we're in an interrupt, have no user context or are running in an * atomic region then we must not take the fault. diff --git a/trunk/arch/x86/mm/fault_64.c b/trunk/arch/x86/mm/fault_64.c index 80f8436ac8b2..c6b3ad515cf1 100644 --- a/trunk/arch/x86/mm/fault_64.c +++ b/trunk/arch/x86/mm/fault_64.c @@ -355,6 +355,8 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs, si_code = SEGV_MAPERR; + if (notify_page_fault(regs)) + return; /* * We fault-in kernel-space virtual memory on-demand. The @@ -380,8 +382,6 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs, if (vmalloc_fault(address) >= 0) return; } - if (notify_page_fault(regs)) - return; /* * Don't take the mm semaphore here. If we fixup a prefetch * fault we could otherwise deadlock. @@ -389,9 +389,6 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs, goto bad_area_nosemaphore; } - if (notify_page_fault(regs)) - return; - if (likely(regs->flags & X86_EFLAGS_IF)) local_irq_enable();