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x86_64: oops_begin() fix

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We don't want to see this:

>  BUG: using smp_processor_id() in preemptible [00000001] code: bash/3857
>  caller is oops_begin+0xb/0x6f
>
>  Call Trace:
>  [<ffffffff8020ab4d>] show_trace+0x34/0x4f
>  [<ffffffff8020ab7a>] dump_stack+0x12/0x17
>  [<ffffffff8030d92d>] debug_smp_processor_id+0xad/0xbc
>  [<ffffffff8042388f>] oops_begin+0xb/0x6f
>  [<ffffffff8042520b>] do_page_fault+0x66a/0x7c0
>  [<ffffffff804234bd>] error_exit+0x0/0x84
>

coming out when the kernel is trying to oops.

Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrew Morton 2007-06-08 13:47:01 -07:00 committed by Linus Torvalds
parent 12710a56cb
commit b39b70366c
1 changed files with 2 additions and 1 deletions
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3
arch/x86_64/kernel/traps.c
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@ -465,13 +465,14 @@ static unsigned int die_nest_count;
unsigned __kprobes long oops_begin(void)
{
int cpu = smp_processor_id();
int cpu;
unsigned long flags;
oops_enter();
/* racy, but better than risking deadlock. */
local_irq_save(flags);
cpu = smp_processor_id();
if (!spin_trylock(&die_lock)) {
if (cpu == die_owner)
/* nested oops. should stop eventually */;