x86_64: oops_begin() fix
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>
diff --git a/arch/x86_64/kernel/traps.c b/arch/x86_64/kernel/traps.c
index cb29fb9..aac1c0b 100644
--- a/arch/x86_64/kernel/traps.c
+++ b/arch/x86_64/kernel/traps.c
@@ -465,13 +465,14 @@
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 */;
