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mtrr atomicity fix 

Rafael gets this on an SMP box with kernel preemption enabled, during
hibernation and restore (100% of the time):

Enabling non-boot CPUs ...
BUG: using smp_processor_id() in preemptible [00000001] code: bash/4514
caller is mtrr_save_state+0x9/0x40

Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
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 2007-06-03 13:50:40 -07:00 committed by Linus Torvalds
parent e44a45ae7b
commit 4c738480d2
1 changed files with 4 additions and 1 deletions
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5
arch/i386/kernel/cpu/mtrr/main.c
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@ -734,10 +734,13 @@ void mtrr_ap_init(void)
*/ */
void mtrr_save_state(void) void mtrr_save_state(void)
{ {
if (smp_processor_id() == 0) int cpu = get_cpu();
if (cpu == 0)
mtrr_save_fixed_ranges(NULL); mtrr_save_fixed_ranges(NULL);
else else
smp_call_function_single(0, mtrr_save_fixed_ranges, NULL, 1, 1); smp_call_function_single(0, mtrr_save_fixed_ranges, NULL, 1, 1);
put_cpu();
} }
static int __init mtrr_init_finialize(void) static int __init mtrr_init_finialize(void)