From 1cc99544dde9e48602979f16b9309fade6e93051 Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Fri, 20 Feb 2009 23:07:48 +0100 Subject: [PATCH] x86, mm: fault.c, unify oops handling Impact: add oops-recursion check to 32-bit Unify the oops state-machine, to the 64-bit version. It is slightly more careful in that it does a recursion check in oops_begin(), and is thus more likely to show the relevant oops. It also means that 32-bit will print one more line at the end of pagefault triggered oopses: printk(KERN_EMERG "CR2: %016lx\n", address); Which is generally good information to be seen in partial-dump digital-camera jpegs ;-) The downside is the somewhat more complex critical path. Both variants have been tested well meanwhile by kernel developers crashing their boxes so i dont think this is a practical worry. This removes 3 ugly #ifdefs from no_context() and makes the function a lot nicer read. Cc: Linus Torvalds Signed-off-by: Ingo Molnar --- arch/x86/mm/fault.c | 19 +++---------------- 1 file changed, 3 insertions(+), 16 deletions(-) diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c index ebfaca3bbb12..8fe2dd254df0 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -659,11 +659,8 @@ no_context(struct pt_regs *regs, unsigned long error_code, { struct task_struct *tsk = current; unsigned long *stackend; - -#ifdef CONFIG_X86_64 unsigned long flags; int sig; -#endif /* Are we prepared to handle this kernel fault? */ if (fixup_exception(regs)) @@ -690,11 +687,7 @@ no_context(struct pt_regs *regs, unsigned long error_code, * Oops. The kernel tried to access some bad page. We'll have to * terminate things with extreme prejudice: */ -#ifdef CONFIG_X86_32 - bust_spinlocks(1); -#else flags = oops_begin(); -#endif show_fault_oops(regs, error_code, address); @@ -702,15 +695,10 @@ no_context(struct pt_regs *regs, unsigned long error_code, if (*stackend != STACK_END_MAGIC) printk(KERN_ALERT "Thread overran stack, or stack corrupted\n"); - tsk->thread.cr2 = address; - tsk->thread.trap_no = 14; - tsk->thread.error_code = error_code; + tsk->thread.cr2 = address; + tsk->thread.trap_no = 14; + tsk->thread.error_code = error_code; -#ifdef CONFIG_X86_32 - die("Oops", regs, error_code); - bust_spinlocks(0); - do_exit(SIGKILL); -#else sig = SIGKILL; if (__die("Oops", regs, error_code)) sig = 0; @@ -719,7 +707,6 @@ no_context(struct pt_regs *regs, unsigned long error_code, printk(KERN_EMERG "CR2: %016lx\n", address); oops_end(flags, regs, sig); -#endif } /*