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tracing: Rename trace_event_mutex to trace_event_sem

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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: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
[ Forward ported to my new code ]
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
zhangwei(Jovi) 2013-03-11 15:14:03 +08:00 committed by Steven Rostedt
parent 36a78e9e87
commit 52f6ad6dc3
3 changed files with 20 additions and 20 deletions
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22
kernel/trace/trace_events.c
View File

@ -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;

16
kernel/trace/trace_output.c
View File

@ -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;
}

2
kernel/trace/trace_output.h
View File

@ -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)