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| author | Andrew Morton <akpm@linux-foundation.org> | 2009-09-19 11:55:44 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-09-20 20:00:32 +0200 |
| commit | 89f19f04dc72363d912fd007a399cb10310eff6e (patch) | |
| tree | daa64e5de98a668eed4a2ceeb6ca95c478be4053 /include | |
| parent | 3f04e8cd5b24727a2500f8ab8f3de730ba47b02c (diff) | |
| download | linux-3.10-89f19f04dc72363d912fd007a399cb10310eff6e.tar.gz linux-3.10-89f19f04dc72363d912fd007a399cb10310eff6e.tar.bz2 linux-3.10-89f19f04dc72363d912fd007a399cb10310eff6e.zip | |
sched: Fix raciness in runqueue_is_locked()
runqueue_is_locked() is unavoidably racy due to a poor interface design.
It does
cpu = get_cpu()
ret = some_perpcu_thing(cpu);
put_cpu(cpu);
return ret;
Its return value is unreliable.
Fix.
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <200909191855.n8JItiko022148@imap1.linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/sched.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index 8af3d249170..cc37a3fa506 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -257,7 +257,7 @@ extern asmlinkage void schedule_tail(struct task_struct *prev); extern void init_idle(struct task_struct *idle, int cpu); extern void init_idle_bootup_task(struct task_struct *idle); -extern int runqueue_is_locked(void); +extern int runqueue_is_locked(int cpu); extern void task_rq_unlock_wait(struct task_struct *p); extern cpumask_var_t nohz_cpu_mask; |