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tracepoint: Optimize the critical region of mutex_lock in tracepoint_module_coming() 

The memory allocation of 'tp_mod' does not require mutex_lock()
protection, move it out.

Link: https://lkml.kernel.org/r/20220914061416.1630-1-thunder.leizhen@huawei.com

Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Zhen Lei 2022-09-14 14:14:16 +08:00 committed by Steven Rostedt (Google)
parent fde59ab161
commit 51714678ea
1 changed files with 6 additions and 8 deletions
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14
kernel/tracepoint.c
View File

@ -640,7 +640,6 @@ static void tp_module_going_check_quiescent(struct tracepoint *tp, void *priv)
static int tracepoint_module_coming(struct module *mod)
{
struct tp_module *tp_mod;
int ret = 0;
if (!mod->num_tracepoints)
return 0;
@ -652,19 +651,18 @@ static int tracepoint_module_coming(struct module *mod)
*/
if (trace_module_has_bad_taint(mod))
return 0;
mutex_lock(&tracepoint_module_list_mutex);
tp_mod = kmalloc(sizeof(struct tp_module), GFP_KERNEL);
if (!tp_mod) {
ret = -ENOMEM;
goto end;
}
if (!tp_mod)
return -ENOMEM;
tp_mod->mod = mod;
mutex_lock(&tracepoint_module_list_mutex);
list_add_tail(&tp_mod->list, &tracepoint_module_list);
blocking_notifier_call_chain(&tracepoint_notify_list,
MODULE_STATE_COMING, tp_mod);
end:
mutex_unlock(&tracepoint_module_list_mutex);
return ret;
return 0;
}
static void tracepoint_module_going(struct module *mod)