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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2010-09-10 12:51:54 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-09-10 16:24:33 +0200 |
| commit | cee010ec5211b96f33c5c2208f5c14ebb04b634a (patch) | |
| tree | dae35fd772d7e18db94b320a0ffc97e55e719d0e | |
| parent | 3b8fad3e2f5f69bfd8e42d099ca8582fb2342edf (diff) | |
| download | talos-obmc-linux-cee010ec5211b96f33c5c2208f5c14ebb04b634a.tar.gz talos-obmc-linux-cee010ec5211b96f33c5c2208f5c14ebb04b634a.zip | |
perf: Ensure we call add_event_to_ctx() with the right locks held
Even though we call it from the inherit path, where the child is
not yet accessible, we need to hold ctx->lock, add_event_to_ctx()
assumes IRQs are disabled.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | kernel/perf_event.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/perf_event.c b/kernel/perf_event.c index eaf1c5de6dcc..f395fb4d9b74 100644 --- a/kernel/perf_event.c +++ b/kernel/perf_event.c @@ -5913,6 +5913,7 @@ inherit_event(struct perf_event *parent_event, struct perf_event_context *child_ctx) { struct perf_event *child_event; + unsigned long flags; /* * Instead of creating recursive hierarchies of events, @@ -5957,7 +5958,9 @@ inherit_event(struct perf_event *parent_event, /* * Link it up in the child's context: */ + raw_spin_lock_irqsave(&child_ctx->lock, flags); add_event_to_ctx(child_event, child_ctx); + raw_spin_unlock_irqrestore(&child_ctx->lock, flags); /* * Get a reference to the parent filp - we will fput it |
