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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2009-12-16 18:04:33 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-12-16 19:01:54 +0100 |
| commit | e6c8fba7771563b2f3dfb96a78f36ec17e15bdf0 (patch) | |
| tree | 232d6ea7b028d3a98ea5eaa9ceffb21aff19db35 /kernel | |
| parent | 9ee349ad6d326df3633d43f54202427295999c47 (diff) | |
| download | lwn-e6c8fba7771563b2f3dfb96a78f36ec17e15bdf0.tar.gz lwn-e6c8fba7771563b2f3dfb96a78f36ec17e15bdf0.zip | |
sched: Fix task_hot() test order
Make sure not to access sched_fair fields before verifying it is
indeed a sched_fair task.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
CC: stable@kernel.org
LKML-Reference: <20091216170517.577998058@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sched.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 9c30858b6463..1d8ca25dd6fb 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -2046,6 +2046,9 @@ task_hot(struct task_struct *p, u64 now, struct sched_domain *sd) { s64 delta; + if (p->sched_class != &fair_sched_class) + return 0; + /* * Buddy candidates are cache hot: */ @@ -2054,9 +2057,6 @@ task_hot(struct task_struct *p, u64 now, struct sched_domain *sd) &p->se == cfs_rq_of(&p->se)->last)) return 1; - if (p->sched_class != &fair_sched_class) - return 0; - if (sysctl_sched_migration_cost == -1) return 1; if (sysctl_sched_migration_cost == 0) |