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sched: Fix unregister_fair_sched_group()

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In the flipping and flopping between calling
unregister_fair_sched_group() on a per-cpu versus per-group basis
we ended up in a bad state.

Remove from the list for the passed cpu as opposed to some
arbitrary index.

( This fixes explosions w/ autogroup as well as a group
  creation/destruction stress test. )

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Turner <pjt@google.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
LKML-Reference: <20101130005740.080828123@google.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Paul Turner 2010-11-29 16:55:40 -08:00 committed by Ingo Molnar
parent b7a2b39d9b
commit 822bc180a7
1 changed files with 1 additions and 2 deletions
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3
kernel/sched.c
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@ -8085,7 +8085,6 @@ static inline void unregister_fair_sched_group(struct task_group *tg, int cpu)
{ {
struct rq *rq = cpu_rq(cpu); struct rq *rq = cpu_rq(cpu);
unsigned long flags; unsigned long flags;
int i;
/* /*
* Only empty task groups can be destroyed; so we can speculatively * Only empty task groups can be destroyed; so we can speculatively
@ -8095,7 +8094,7 @@ static inline void unregister_fair_sched_group(struct task_group *tg, int cpu)
return; return;
raw_spin_lock_irqsave(&rq->lock, flags); raw_spin_lock_irqsave(&rq->lock, flags);
list_del_leaf_cfs_rq(tg->cfs_rq[i]); list_del_leaf_cfs_rq(tg->cfs_rq[cpu]);
raw_spin_unlock_irqrestore(&rq->lock, flags); raw_spin_unlock_irqrestore(&rq->lock, flags);
} }
#else /* !CONFG_FAIR_GROUP_SCHED */ #else /* !CONFG_FAIR_GROUP_SCHED */