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perf_counter: Sanitize counter->mutex

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s/counter->mutex/counter->child_mutex/ and make sure its only
used to protect child_list.

The usage in __perf_counter_exit_task() doesn't appear to be
problematic since ctx->mutex also covers anything related to fd
tear-down.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: John Kacur <jkacur@redhat.com>
LKML-Reference: <20090523163012.533186528@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra
2009-05-23 18:28:56 +02:00
committed by Ingo Molnar
parent e220d2dcb9
commit fccc714b31
2 changed files with 22 additions and 32 deletions
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7
include/linux/perf_counter.h
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@@ -452,9 +452,6 @@ struct perf_counter {
struct perf_counter_context *ctx;
struct file *filp;
struct perf_counter *parent;
struct list_head child_list;
/*
* These accumulate total time (in nanoseconds) that children
* counters have been enabled and running, respectively.
@@ -465,7 +462,9 @@ struct perf_counter {
/*
* Protect attach/detach and child_list:
*/
struct mutex mutex;
struct mutex child_mutex;
struct list_head child_list;
struct perf_counter *parent;
int oncpu;
int cpu;