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perf: Clean up 'ctx' reference counting

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Small cleanup to how we refcount in find_get_context(), this also
allows us to use put_ctx() to free things instead of using kfree().

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20110409192141.719340481@chello.nl
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2011-04-09 21:17:41 +02:00 committed by Ingo Molnar
parent 075e0b0085
commit 9137fb28ac
1 changed files with 3 additions and 7 deletions
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10
kernel/events/core.c
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@ -2835,16 +2835,12 @@ find_get_context(struct pmu *pmu, struct task_struct *task, int cpu)
unclone_ctx(ctx);
++ctx->pin_count;
raw_spin_unlock_irqrestore(&ctx->lock, flags);
}
if (!ctx) {
} else {
ctx = alloc_perf_context(pmu, task);
err = -ENOMEM;
if (!ctx)
goto errout;
get_ctx(ctx);
err = 0;
mutex_lock(&task->perf_event_mutex);
/*
@ -2856,14 +2852,14 @@ find_get_context(struct pmu *pmu, struct task_struct *task, int cpu)
else if (task->perf_event_ctxp[ctxn])
err = -EAGAIN;
else {
get_ctx(ctx);
++ctx->pin_count;
rcu_assign_pointer(task->perf_event_ctxp[ctxn], ctx);
}
mutex_unlock(&task->perf_event_mutex);
if (unlikely(err)) {
put_task_struct(task);
kfree(ctx);
put_ctx(ctx);
if (err == -EAGAIN)
goto retry;