forked from Minki/linux
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>
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@ -2046,6 +2046,9 @@ task_hot(struct task_struct *p, u64 now, struct sched_domain *sd)
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{
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s64 delta;
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if (p->sched_class != &fair_sched_class)
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return 0;
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/*
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* Buddy candidates are cache hot:
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*/
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@ -2054,9 +2057,6 @@ task_hot(struct task_struct *p, u64 now, struct sched_domain *sd)
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&p->se == cfs_rq_of(&p->se)->last))
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return 1;
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if (p->sched_class != &fair_sched_class)
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return 0;
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if (sysctl_sched_migration_cost == -1)
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return 1;
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if (sysctl_sched_migration_cost == 0)
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