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sched: numa: ksm: fix oops in task_numa_placment()

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task_numa_placement() oopsed on NULL p->mm when task_numa_fault() got
called in the handling of break_ksm() for ksmd.  That might be a
peculiar case, which perhaps KSM could takes steps to avoid? but it's
more robust if task_numa_placement() allows for such a possibility.

Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Hugh Dickins 2012-12-19 17:42:16 -08:00 committed by Linus Torvalds
parent cda73a10eb
commit 2832bc19f6
1 changed files with 4 additions and 1 deletions
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5
kernel/sched/fair.c
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@ -793,8 +793,11 @@ unsigned int sysctl_numa_balancing_scan_delay = 1000;
static void task_numa_placement(struct task_struct *p)
{
int seq = ACCESS_ONCE(p->mm->numa_scan_seq);
int seq;
if (!p->mm) /* for example, ksmd faulting in a user's mm */
return;
seq = ACCESS_ONCE(p->mm->numa_scan_seq);
if (p->numa_scan_seq == seq)
return;
p->numa_scan_seq = seq;