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| author | Steven Rostedt (Red Hat) <rostedt@goodmis.org> | 2014-02-26 13:37:38 -0500 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2014-03-03 21:11:05 -0500 |
| commit | 45ab2813d40d88fc575e753c38478de242d03f88 (patch) | |
| tree | 1859b05c3be128fd1c0a97c09c2fade4ad91e2e2 /include/linux/tracepoint.h | |
| parent | 0414855fdc4a40da05221fc6062cccbc0c30f169 (diff) | |
| download | lwn-45ab2813d40d88fc575e753c38478de242d03f88.tar.gz lwn-45ab2813d40d88fc575e753c38478de242d03f88.zip | |
tracing: Do not add event files for modules that fail tracepoints
If a module fails to add its tracepoints due to module tainting, do not
create the module event infrastructure in the debugfs directory. As the events
will not work and worse yet, they will silently fail, making the user wonder
why the events they enable do not display anything.
Having a warning on module load and the events not visible to the users
will make the cause of the problem much clearer.
Link: http://lkml.kernel.org/r/20140227154923.265882695@goodmis.org
Fixes: 6d723736e472 "tracing/events: add support for modules to TRACE_EVENT"
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: stable@vger.kernel.org # 2.6.31+
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'include/linux/tracepoint.h')
| -rw-r--r-- | include/linux/tracepoint.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h index accc497f8d72..7159a0a933df 100644 --- a/include/linux/tracepoint.h +++ b/include/linux/tracepoint.h @@ -60,6 +60,12 @@ struct tp_module { unsigned int num_tracepoints; struct tracepoint * const *tracepoints_ptrs; }; +bool trace_module_has_bad_taint(struct module *mod); +#else +static inline bool trace_module_has_bad_taint(struct module *mod) +{ + return false; +} #endif /* CONFIG_MODULES */ struct tracepoint_iter { |