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Commit a2bb6a3d authored by Steven Rostedt's avatar Steven Rostedt Committed by Ingo Molnar
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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: default avatarSteven 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: default avatarIngo Molnar <mingo@elte.hu>
parent 26bc83f4

include/linux/ftrace.h

+1 −0
Original line number Diff line number Diff line
@@ -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)

{

kernel/trace/ftrace.c

+15 −0
Original line number Diff line number Diff line
@@ -1601,6 +1601,21 @@ core_initcall(ftrace_dynamic_init); 
# define ftrace_force_shutdown()	do { } while (0)

#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

 *