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| author | James Bottomley <James.Bottomley@SteelEye.com> | 2007-10-29 21:18:11 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2007-10-29 21:18:11 +0100 |
| commit | 7bae49d498de87f0da0c20c67adaa278eac84566 (patch) | |
| tree | 29af1dd7d73da9c06e6295debf0bf963085a1589 /kernel/sched.c | |
| parent | 73a2bcb0edb9ffb0b007b3546b430e2c6e415eee (diff) | |
| download | lwn-7bae49d498de87f0da0c20c67adaa278eac84566.tar.gz lwn-7bae49d498de87f0da0c20c67adaa278eac84566.zip | |
sched: fix incorrect assumption that cpu 0 exists
This patch:
commit 9b5b77512dce239fa168183fa71896712232e95a
Author: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
Date: Mon Oct 15 17:00:09 2007 +0200
sched: clean up code under CONFIG_FAIR_GROUP_SCHED
Introduced an assumption of the existence of CPU0 via this line
cfs_rq = tg->cfs_rq[0];
If you have no CPU0, that will be NULL. The fix seems to be just to
take whatever cfs_rq queue comes out of the for_each_possible_cpu()
loop, since they're all equally good for the destruction operation.
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched.c')
| -rw-r--r-- | kernel/sched.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 74dbb4020cf5..235952b100eb 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -7041,7 +7041,7 @@ static void free_sched_group(struct rcu_head *rhp) /* Destroy runqueue etc associated with a task group */ void sched_destroy_group(struct task_group *tg) { - struct cfs_rq *cfs_rq; + struct cfs_rq *cfs_rq = NULL; int i; for_each_possible_cpu(i) { @@ -7049,7 +7049,7 @@ void sched_destroy_group(struct task_group *tg) list_del_rcu(&cfs_rq->leaf_cfs_rq_list); } - cfs_rq = tg->cfs_rq[0]; + BUG_ON(!cfs_rq); /* wait for possible concurrent references to cfs_rqs complete */ call_rcu(&cfs_rq->rcu, free_sched_group); |