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Commit 4671c794 authored by Steven Rostedt's avatar Steven Rostedt Committed by Steven Rostedt
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tracing: add trace_set_clr_event to export event enabling function 



Other parts of the kernel may need to be able to enable or disable
specific events. Especially parts that create trace events.

[ Impact: allow enabling of trace events by those that create the event ]

Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
parent 29f93943

include/linux/ftrace_event.h

+2 −0
Original line number Diff line number Diff line
@@ -127,6 +127,8 @@ extern int trace_define_field(struct ftrace_event_call *call, char *type, 


#define is_signed_type(type)	(((type)(-1)) < 0)



int trace_set_clr_event(const char *system, const char *event, int set);



/*

 * The double __builtin_constant_p is because gcc will give us an error

 * if we try to allocate the static variable to fmt if it is not a

kernel/trace/trace_events.c

+17 −0
Original line number Diff line number Diff line
@@ -177,6 +177,23 @@ static int ftrace_set_clr_event(char *buf, int set) 
	return __ftrace_set_clr_event(match, sub, event, set);

}



/**

 * trace_set_clr_event - enable or disable an event

 * @system: system name to match (NULL for any system)

 * @event: event name to match (NULL for all events, within system)

 * @set: 1 to enable, 0 to disable

 *

 * This is a way for other parts of the kernel to enable or disable

 * event recording.

 *

 * Returns 0 on success, -EINVAL if the parameters do not match any

 * registered events.

 */

int trace_set_clr_event(const char *system, const char *event, int set)

{

	return __ftrace_set_clr_event(NULL, system, event, set);

}



/* 128 should be much more than enough */

#define EVENT_BUF_SIZE		127