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Commit 52f6ad6d authored by zhangwei(Jovi)'s avatar zhangwei(Jovi) Committed by Steven Rostedt
Browse files

tracing: Rename trace_event_mutex to trace_event_sem 

trace_event_mutex is an rw semaphore now, not a mutex, change the name.

Link: http://lkml.kernel.org/r/513D843B.40109@huawei.com



Signed-off-by: default avatarzhangwei(Jovi) <jovi.zhangwei@huawei.com>
[ Forward ported to my new code ]
Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
parent 36a78e9e

kernel/trace/trace_events.c

+11 −11
Original line number Diff line number Diff line
@@ -1584,7 +1584,7 @@ int trace_add_event_call(struct ftrace_event_call *call) 
}



/*

 * Must be called under locking both of event_mutex and trace_event_mutex.

 * Must be called under locking both of event_mutex and trace_event_sem.

 */

static void __trace_remove_event_call(struct ftrace_event_call *call)

{
@@ -1597,9 +1597,9 @@ static void __trace_remove_event_call(struct ftrace_event_call *call) 
void trace_remove_event_call(struct ftrace_event_call *call)

{

	mutex_lock(&event_mutex);

	down_write(&trace_event_mutex);

	down_write(&trace_event_sem);

	__trace_remove_event_call(call);

	up_write(&trace_event_mutex);

	up_write(&trace_event_sem);

	mutex_unlock(&event_mutex);

}
@@ -1707,7 +1707,7 @@ static void trace_module_remove_events(struct module *mod) 
	struct ftrace_event_call *call, *p;

	bool clear_trace = false;



	down_write(&trace_event_mutex);

	down_write(&trace_event_sem);

	list_for_each_entry_safe(call, p, &ftrace_events, list) {

		if (call->mod == mod) {

			if (call->flags & TRACE_EVENT_FL_WAS_ENABLED)
@@ -1725,7 +1725,7 @@ static void trace_module_remove_events(struct module *mod) 
		list_del(&file_ops->list);

		kfree(file_ops);

	}

	up_write(&trace_event_mutex);

	up_write(&trace_event_sem);



	/*

	 * It is safest to reset the ring buffer if the module being unloaded
@@ -2262,9 +2262,9 @@ int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr) 
	if (ret)

		goto out_unlock;



	down_write(&trace_event_mutex);

	down_write(&trace_event_sem);

	__trace_add_event_dirs(tr);

	up_write(&trace_event_mutex);

	up_write(&trace_event_sem);



 out_unlock:

	mutex_unlock(&event_mutex);
@@ -2287,9 +2287,9 @@ early_event_add_tracer(struct dentry *parent, struct trace_array *tr) 
	if (ret)

		goto out_unlock;



	down_write(&trace_event_mutex);

	down_write(&trace_event_sem);

	__trace_early_add_event_dirs(tr);

	up_write(&trace_event_mutex);

	up_write(&trace_event_sem);



 out_unlock:

	mutex_unlock(&event_mutex);
@@ -2304,10 +2304,10 @@ int event_trace_del_tracer(struct trace_array *tr) 


	mutex_lock(&event_mutex);



	down_write(&trace_event_mutex);

	down_write(&trace_event_sem);

	__trace_remove_event_dirs(tr);

	debugfs_remove_recursive(tr->event_dir);

	up_write(&trace_event_mutex);

	up_write(&trace_event_sem);



	tr->event_dir = NULL;

kernel/trace/trace_output.c

+8 −8
Original line number Diff line number Diff line
@@ -14,7 +14,7 @@ 
/* must be a power of 2 */

#define EVENT_HASHSIZE	128



DECLARE_RWSEM(trace_event_mutex);

DECLARE_RWSEM(trace_event_sem);



static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
@@ -826,12 +826,12 @@ static int trace_search_list(struct list_head **list) 


void trace_event_read_lock(void)

{

	down_read(&trace_event_mutex);

	down_read(&trace_event_sem);

}



void trace_event_read_unlock(void)

{

	up_read(&trace_event_mutex);

	up_read(&trace_event_sem);

}



/**
@@ -854,7 +854,7 @@ int register_ftrace_event(struct trace_event *event) 
	unsigned key;

	int ret = 0;



	down_write(&trace_event_mutex);

	down_write(&trace_event_sem);



	if (WARN_ON(!event))

		goto out;
@@ -909,14 +909,14 @@ int register_ftrace_event(struct trace_event *event) 


	ret = event->type;

 out:

	up_write(&trace_event_mutex);

	up_write(&trace_event_sem);



	return ret;

}

EXPORT_SYMBOL_GPL(register_ftrace_event);



/*

 * Used by module code with the trace_event_mutex held for write.

 * Used by module code with the trace_event_sem held for write.

 */

int __unregister_ftrace_event(struct trace_event *event)

{
@@ -931,9 +931,9 @@ int __unregister_ftrace_event(struct trace_event *event) 
 */

int unregister_ftrace_event(struct trace_event *event)

{

	down_write(&trace_event_mutex);

	down_write(&trace_event_sem);

	__unregister_ftrace_event(event);

	up_write(&trace_event_mutex);

	up_write(&trace_event_sem);



	return 0;

}

kernel/trace/trace_output.h

+1 −1
Original line number Diff line number Diff line
@@ -33,7 +33,7 @@ trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry); 


/* used by module unregistering */

extern int __unregister_ftrace_event(struct trace_event *event);

extern struct rw_semaphore trace_event_mutex;

extern struct rw_semaphore trace_event_sem;



#define MAX_MEMHEX_BYTES	8

#define HEX_CHARS		(MAX_MEMHEX_BYTES*2 + 1)