From 446f713ba1afd68568139ae4691335ba273fa7f4 Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Thu, 7 Dec 2006 02:14:12 +0100 Subject: [PATCH] [PATCH] unwinder: always use unlocked module list access in unwinder fallback We're already well protected against module unloads because module unload uses stop_machine(). The only exception is NMIs, but other users already risk lockless accesses here. This avoids some hackery in lockdep and also a potential deadlock This matches what i386 does. Signed-off-by: Andi Kleen --- arch/x86_64/kernel/traps.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/x86_64/kernel/traps.c b/arch/x86_64/kernel/traps.c index 75ceccee178c..9864d195c408 100644 --- a/arch/x86_64/kernel/traps.c +++ b/arch/x86_64/kernel/traps.c @@ -317,9 +317,9 @@ void dump_trace(struct task_struct *tsk, struct pt_regs *regs, #define HANDLE_STACK(cond) \ do while (cond) { \ unsigned long addr = *stack++; \ - if (oops_in_progress ? \ - __kernel_text_address(addr) : \ - kernel_text_address(addr)) { \ + /* Use unlocked access here because except for NMIs \ + we should be already protected against module unloads */ \ + if (__kernel_text_address(addr)) { \ /* \ * If the address is either in the text segment of the \ * kernel, or in the region which contains vmalloc'ed \ -- 2.30.2