diff options
| author | Tom Zanussi <tzanussi@gmail.com> | 2009-04-17 00:27:08 -0500 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-04-17 18:28:27 +0200 |
| commit | ac1adc55fc71c7515caa2eb0e63e49b3d1c6a47c (patch) | |
| tree | 7a97cf9512572c53d0802725f8e0ad6a2d4b2204 /kernel/trace/trace.h | |
| parent | 46de405f25f1d9fa73b657ffbb752aa0cc87a91d (diff) | |
tracing/filters: add filter_mutex to protect filter predicates
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>
Diffstat (limited to 'kernel/trace/trace.h')
| -rw-r--r-- | kernel/trace/trace.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index 8817c18ef97..247948e81b0 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -757,13 +757,15 @@ struct filter_pred { }; extern void filter_free_pred(struct filter_pred *pred); -extern void filter_print_preds(struct filter_pred **preds, int n_preds, +extern void filter_print_preds(struct ftrace_event_call *call, struct trace_seq *s); extern int filter_parse(char **pbuf, struct filter_pred *pred); extern int filter_add_pred(struct ftrace_event_call *call, struct filter_pred *pred); extern void filter_disable_preds(struct ftrace_event_call *call); extern void filter_free_subsystem_preds(struct event_subsystem *system); +extern void filter_print_subsystem_preds(struct event_subsystem *system, + struct trace_seq *s); extern int filter_add_subsystem_pred(struct event_subsystem *system, struct filter_pred *pred); |