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Commit b5be1132 authored by KOSAKI Motohiro's avatar KOSAKI Motohiro Committed by Linus Torvalds
Browse files

make vmstat cpu-unplug safe 



When accessing cpu_online_map, we should prevent dynamic changing
of cpu_online_map by get_online_cpus().

Unfortunately, all_vm_events() doesn't do that.

Signed-off-by: default avatarKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: default avatarChristoph Lameter <clameter@sgi.com>
Cc: Gautham R Shenoy <ego@in.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 78f508ab

mm/vmstat.c

+2 −0
Original line number Diff line number Diff line
@@ -41,7 +41,9 @@ static void sum_vm_events(unsigned long *ret, cpumask_t *cpumask) 
*/

void all_vm_events(unsigned long *ret)

{

	get_online_cpus();

	sum_vm_events(ret, &cpu_online_map);

	put_online_cpus();

}

EXPORT_SYMBOL_GPL(all_vm_events);