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| author |   Wu Fengguang <fengguang.wu@intel.com> | 2008-11-27 16:14:44 +0800 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2008-11-28 16:47:41 +0100 |
| commit | a838c2ec6ea1f18431da74dfe4978c57355b95f3 (patch) | |
| tree | c51852ff62ec383c27e21f318f5e3180f141b885 /include/linux/marker.h | |
| parent | Merge branches 'tracing/blktrace', 'tracing/ftrace', 'tracing/function-graph-tracer' and 'tracing/power-tracer' into tracing/core (diff) | |
| download | linux-dev-a838c2ec6ea1f18431da74dfe4978c57355b95f3.tar.xz linux-dev-a838c2ec6ea1f18431da74dfe4978c57355b95f3.zip | |
markers: comment marker_synchronize_unregister() on data dependency
Add document and comments on marker_synchronize_unregister(): it
should be called before freeing resources that the probes depend on.
Based on comments from Lai Jiangshan and Mathieu Desnoyers.
Signed-off-by: Wu Fengguang <wfg@linux.intel.com>
Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Reviewed-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/marker.h')
| -rw-r--r-- | include/linux/marker.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/include/linux/marker.h b/include/linux/marker.h index 34c14bc957f5..b85e74ca782f 100644 --- a/include/linux/marker.h +++ b/include/linux/marker.h @@ -211,8 +211,10 @@ extern void *marker_get_private_data(const char *name, marker_probe_func *probe, /* * marker_synchronize_unregister must be called between the last marker probe - * unregistration and the end of module exit to make sure there is no caller - * executing a probe when it is freed. + * unregistration and the first one of + * - the end of module exit function + * - the free of any resource used by the probes + * to ensure the code and data are valid for any possibly running probes. */ #define marker_synchronize_unregister() synchronize_sched() |