[PATCH] kprobes: Remove unneeded module_mutex lock from the optimizer

[Masami Hiramatsu]

Remove unneeded module_mutex locking from the optimizer. Since
we already locks both kprobe_mutex and text_mutex in the optimizer,
text will not be changed and the module unloading will be stopped
inside kprobes_module_callback().

Suggested-by: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
---
 kernel/kprobes.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 4a904cc56d68..d1b02e890793 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -563,8 +563,6 @@ static void kprobe_optimizer(struct work_struct *work)
 	mutex_lock(&kprobe_mutex);
 	cpus_read_lock();
 	mutex_lock(&text_mutex);
-	/* Lock modules while optimizing kprobes */
-	mutex_lock(&module_mutex);
 
 	/*
 	 * Step 1: Unoptimize kprobes and collect cleaned (unused and disarmed)
@@ -589,7 +587,6 @@ static void kprobe_optimizer(struct work_struct *work)
 	/* Step 4: Free cleaned kprobes after quiesence period */
 	do_free_cleaned_kprobes();
 
-	mutex_unlock(&module_mutex);
 	mutex_unlock(&text_mutex);
 	cpus_read_unlock();
 
-- 
2.25.1
-- 
Masami Hiramatsu <mhiramat@xxxxxxxxxx>