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| author | Steven Rostedt <rostedt@goodmis.org> | 2008-07-10 20:58:15 -0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-07-11 15:49:21 +0200 |
| commit | a2bb6a3d85ef3124cd336403a95abc0540d3fbe2 (patch) | |
| tree | 3048f355cc3ca814222ba34943c9a8f735e7a5e6 | |
| parent | 26bc83f4cb911a0b4dabfe23b700aaf3235f2955 (diff) | |
| download | op-kernel-dev-a2bb6a3d85ef3124cd336403a95abc0540d3fbe2.zip op-kernel-dev-a2bb6a3d85ef3124cd336403a95abc0540d3fbe2.tar.gz | |
ftrace: add ftrace_kill_atomic
It has been suggested that I add a way to disable the function tracer
on an oops. This code adds a ftrace_kill_atomic. It is not meant to be
used in normal situations. It will disable the ftrace tracer, but will
not perform the nice shutdown that requires scheduling.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Cc: Steven Rostedt <srostedt@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | include/linux/ftrace.h | 1 | ||||
| -rw-r--r-- | kernel/trace/ftrace.c | 15 |
2 files changed, 16 insertions, 0 deletions
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h index 3121b95..f368d04 100644 --- a/include/linux/ftrace.h +++ b/include/linux/ftrace.h @@ -89,6 +89,7 @@ void ftrace_enable_daemon(void); /* totally disable ftrace - can not re-enable after this */ void ftrace_kill(void); +void ftrace_kill_atomic(void); static inline void tracer_disable(void) { diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 0f271c4..1359632 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -1602,6 +1602,21 @@ core_initcall(ftrace_dynamic_init); #endif /* CONFIG_DYNAMIC_FTRACE */ /** + * ftrace_kill_atomic - kill ftrace from critical sections + * + * This function should be used by panic code. It stops ftrace + * but in a not so nice way. If you need to simply kill ftrace + * from a non-atomic section, use ftrace_kill. + */ +void ftrace_kill_atomic(void) +{ + ftrace_disabled = 1; + ftrace_enabled = 0; + ftraced_suspend = -1; + clear_ftrace_function(); +} + +/** * ftrace_kill - totally shutdown ftrace * * This is a safety measure. If something was detected that seems |
