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mm: do not iterate over NR_CPUS in __zone_pcp_update()

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__zone_pcp_update() iterates over NR_CPUS instead of limiting the access
to the possible cpus.  This might result in access to uninitialized areas
as the per cpu allocator only populates the per cpu memory for possible
cpus.

This problem was created as a result of the dynamic allocation of pagesets
from percpu memory that went in during the merge window - commit
99dcc3e5a9 ("this_cpu: Page allocator
conversion").

Signed-off-by: Thomas Gleixner <[email protected]>
Acked-by: Pekka Enberg <[email protected]>
Acked-by: Tejun Heo <[email protected]>
Acked-by: Christoph Lameter <[email protected]>
Acked-by: Mel Gorman <[email protected]>
Reviewed-by: KOSAKI Motohiro <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Thomas Gleixner 2010-03-10 15:20:40 -08:00 • committed by Linus Torvalds
commit 2d30a1f631
1 changed files with 1 additions and 1 deletions
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2
mm/page_alloc.c
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@ -3224,7 +3224,7 @@ static int __zone_pcp_update(void *data)
int cpu;
unsigned long batch = zone_batchsize(zone), flags;
for (cpu = 0; cpu < NR_CPUS; cpu++) {
for_each_possible_cpu(cpu) {
struct per_cpu_pageset *pset;
struct per_cpu_pages *pcp;