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| author | Peter Zijlstra <peterz@infradead.org> | 2014-10-08 18:51:10 +0200 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2014-10-09 01:51:01 +0200 |
| commit | fe0e01c77dd9f7a60916aec2149d8a1182baf63c (patch) | |
| tree | 471eff9f1eefdacc887936f196c7be2e3f7af40d /kernel/trace/trace_events.c | |
| parent | Linux 3.17 (diff) | |
| download | linux-fe0e01c77dd9f7a60916aec2149d8a1182baf63c.tar.xz linux-fe0e01c77dd9f7a60916aec2149d8a1182baf63c.zip | |
tracing: Robustify wait loop
The pending nested sleep debugging triggered on the potential stale
TASK_INTERRUPTIBLE in this code.
While there, fix the loop such that we won't revert to a while(1)
yield() 'spin' loop if we ever get a spurious wakeup.
And fix the actual issue by properly terminating the 'wait' loop by
setting TASK_RUNNING.
Link: http://lkml.kernel.org/p/20141008165110.GA14547@worktop.programming.kicks-ass.net
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace_events.c')
| -rw-r--r-- | kernel/trace/trace_events.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c index ef06ce7e9cf8..0cc51edde3a8 100644 --- a/kernel/trace/trace_events.c +++ b/kernel/trace/trace_events.c @@ -2513,8 +2513,11 @@ static __init int event_test_thread(void *unused) kfree(test_malloc); set_current_state(TASK_INTERRUPTIBLE); - while (!kthread_should_stop()) + while (!kthread_should_stop()) { schedule(); + set_current_state(TASK_INTERRUPTIBLE); + } + __set_current_state(TASK_RUNNING); return 0; } |