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| author | Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | 2015-05-17 18:53:10 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-06-19 10:06:44 +0200 |
| commit | d84525a845cc2617d638349f8756a9fec9ac8113 (patch) | |
| tree | 0f16e6ed6c719791c9ad21cd14240bf9fca092ab /kernel/sched | |
| parent | sched/stop_machine: Fix deadlock between multiple stop_two_cpus() (diff) | |
| download | linux-d84525a845cc2617d638349f8756a9fec9ac8113.tar.xz linux-d84525a845cc2617d638349f8756a9fec9ac8113.zip | |
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/sched')
| -rw-r--r-- | kernel/sched/core.c | 2 |
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) { |