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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2009-12-16 18:04:33 +0100
committerIngo Molnar <mingo@elte.hu>2009-12-16 19:01:54 +0100
commite6c8fba7771563b2f3dfb96a78f36ec17e15bdf0 (patch)
tree232d6ea7b028d3a98ea5eaa9ceffb21aff19db35 /kernel
parent9ee349ad6d326df3633d43f54202427295999c47 (diff)
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.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 9c30858b646..1d8ca25dd6f 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)