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| author | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2017-03-03 16:15:39 -0500 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2017-03-24 20:51:49 -0400 |
| commit | 42c269c88dc146982a54a8267f71abc99f12852a (patch) | |
| tree | 2fecaaec16fe65febc290be5d67b396d0d0f75e3 /include/linux/ftrace.h | |
| parent | dbeafd0d6131d0f6ae8cd7551f5f4bf8c54aa49a (diff) | |
| download | op-kernel-dev-42c269c88dc146982a54a8267f71abc99f12852a.zip op-kernel-dev-42c269c88dc146982a54a8267f71abc99f12852a.tar.gz | |
ftrace: Allow for function tracing to record init functions on boot up
Adding a hook into free_reserve_area() that informs ftrace that boot up init
text is being free, lets ftrace safely remove those init functions from its
records, which keeps ftrace from trying to modify text that no longer
exists.
Note, this still does not allow for tracing .init text of modules, as
modules require different work for freeing its init code.
Link: http://lkml.kernel.org/r/1488502497.7212.24.camel@linux.intel.com
Cc: linux-mm@kvack.org
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Requested-by: Todd Brandt <todd.e.brandt@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'include/linux/ftrace.h')
| -rw-r--r-- | include/linux/ftrace.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h index 569db55..0276a2c 100644 --- a/include/linux/ftrace.h +++ b/include/linux/ftrace.h @@ -146,6 +146,10 @@ struct ftrace_ops_hash { struct ftrace_hash *filter_hash; struct mutex regex_lock; }; + +void ftrace_free_mem(void *start, void *end); +#else +static inline void ftrace_free_mem(void *start, void *end) { } #endif /* @@ -262,6 +266,7 @@ static inline int ftrace_nr_registered_ops(void) } static inline void clear_ftrace_function(void) { } static inline void ftrace_kill(void) { } +static inline void ftrace_free_mem(void *start, void *end) { } #endif /* CONFIG_FUNCTION_TRACER */ #ifdef CONFIG_STACK_TRACER |
