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authorLinus Torvalds <torvalds@linux-foundation.org>2009-02-17 14:30:06 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-02-17 14:30:06 -0800
commite78ac4b9deb8f36d8c828b6d91232960f109d951 (patch)
tree09d0eb38a666071bc90a8637cd0501ecc152cda0 /kernel
parent29a0c5ce5d008f398346d644456d62ab300d5e10 (diff)
parenta0490fa35dc0022ef95f64802e8edf18c411c790 (diff)
downloadlwn-e78ac4b9deb8f36d8c828b6d91232960f109d951.tar.gz
lwn-e78ac4b9deb8f36d8c828b6d91232960f109d951.zip
Merge branch 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: sched: cpu hotplug fix
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sched.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index c1d0ed360088..410eec404133 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -6944,20 +6944,26 @@ static void free_rootdomain(struct root_domain *rd)
static void rq_attach_root(struct rq *rq, struct root_domain *rd)
{
+ struct root_domain *old_rd = NULL;
unsigned long flags;
spin_lock_irqsave(&rq->lock, flags);
if (rq->rd) {
- struct root_domain *old_rd = rq->rd;
+ old_rd = rq->rd;
if (cpumask_test_cpu(rq->cpu, old_rd->online))
set_rq_offline(rq);
cpumask_clear_cpu(rq->cpu, old_rd->span);
- if (atomic_dec_and_test(&old_rd->refcount))
- free_rootdomain(old_rd);
+ /*
+ * If we dont want to free the old_rt yet then
+ * set old_rd to NULL to skip the freeing later
+ * in this function:
+ */
+ if (!atomic_dec_and_test(&old_rd->refcount))
+ old_rd = NULL;
}
atomic_inc(&rd->refcount);
@@ -6968,6 +6974,9 @@ static void rq_attach_root(struct rq *rq, struct root_domain *rd)
set_rq_online(rq);
spin_unlock_irqrestore(&rq->lock, flags);
+
+ if (old_rd)
+ free_rootdomain(old_rd);
}
static int __init_refok init_rootdomain(struct root_domain *rd, bool bootmem)