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authorMathieu Desnoyers <mathieu.desnoyers@efficios.com>2015-05-17 12:53:10 -0400
committerIngo Molnar <mingo@kernel.org>2015-06-19 10:06:44 +0200
commitd84525a845cc2617d638349f8756a9fec9ac8113 (patch)
tree0f16e6ed6c719791c9ad21cd14240bf9fca092ab /kernel
parentb17718d02f54b90978d0e0146368b512b11c3e84 (diff)
downloadlinux-d84525a845cc2617d638349f8756a9fec9ac8113.tar.bz2
sched/preempt: Fix preempt notifiers documentation about hlist_del() within unsafe iteration
preempt_notifier_unregister() documents: "This is safe to call from within a preemption notifier." However, both fire_sched_in_preempt_notifiers() and fire_sched_out_preempt_notifiers() are using hlist_for_each_entry(), which is not safe against entry removal during iteration. Inspection of the KVM code does not reveal any use of preempt_notifier_unregister() within the preempt notifiers. Therefore, fix the comment. Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Borislav Petkov <bp@alien8.de> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1431881590-1456-1-git-send-email-mathieu.desnoyers@efficios.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sched/core.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index af0a5a6cee98..bdb7aa67baef 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -2165,7 +2165,7 @@ EXPORT_SYMBOL_GPL(preempt_notifier_register);
* preempt_notifier_unregister - no longer interested in preemption notifications
* @notifier: notifier struct to unregister
*
- * This is safe to call from within a preemption notifier.
+ * This is *not* safe to call from within a preemption notifier.
*/
void preempt_notifier_unregister(struct preempt_notifier *notifier)
{