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| author | Ingo Molnar <mingo@elte.hu> | 2009-05-17 11:08:41 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-05-29 14:28:37 +0200 |
| commit | 012b84dae17126d8b5d159173091eb3db5a2bc43 (patch) | |
| tree | 0b5f85b66084c3186a8e4c56d9ed074d3b2593ee /kernel/perf_counter.c | |
| parent | 3f4dee227348daac32f36daad9a91059efd0723e (diff) | |
| download | lwn-012b84dae17126d8b5d159173091eb3db5a2bc43.tar.gz lwn-012b84dae17126d8b5d159173091eb3db5a2bc43.zip | |
perf_counter: Robustify counter-free logic
This fixes a nasty crash and highlights a bug that we were
freeing failed-fork() counters incorrectly.
(the fix for that will come separately)
[ Impact: fix crashes/lockups with inherited counters ]
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: John Kacur <jkacur@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/perf_counter.c')
| -rw-r--r-- | kernel/perf_counter.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c index eb346048f00f..616c52426b32 100644 --- a/kernel/perf_counter.c +++ b/kernel/perf_counter.c @@ -1004,6 +1004,10 @@ static void __perf_counter_task_sched_out(struct perf_counter_context *ctx) if (!cpuctx->task_ctx) return; + + if (WARN_ON_ONCE(ctx != cpuctx->task_ctx)) + return; + __perf_counter_sched_out(ctx, cpuctx); cpuctx->task_ctx = NULL; } |