tracing/filters: add filter_mutex to protect filter predicates

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This patch adds a filter_mutex to prevent the filter predicates from
being accessed concurrently by various external functions.

It's based on a previous patch by Li Zefan:
        "[PATCH 7/7] tracing/filters: make filter preds RCU safe"

v2 changes:

- fixed wrong value returned in a add_subsystem_pred() failure case
  noticed by Li Zefan.

[ Impact: fix trace filter corruption/crashes on parallel access ]

Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Reviewed-by: Li Zefan <lizf@cn.fujitsu.com>
Tested-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: paulmck@linux.vnet.ibm.com
LKML-Reference: <1239946028.6639.13.camel@tropicana>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

...

This commit is contained in:

Tom Zanussi 2009-04-17 00:27:08 -05:00 • committed by Ingo Molnar

parent 46de405f25

commit ac1adc55fc

3 changed files with 75 additions and 23 deletions

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4

kernel/trace/trace.h

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4

kernel/trace/trace_events.c

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90

kernel/trace/trace_events_filter.c

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