[PATCH 1/2] audit: Quit audit_free_names() early if name list empty

Optimize audit_free_names() by quitting early if the name list is empty.
This eliminates the need to acquire and release the fs_struct spinlock
in path_put().

Signed-off-by: Waiman Long <[email protected]>
---
 kernel/auditsc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index dd0563a8e0be..824b6fd98561 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -931,6 +931,9 @@ static inline void audit_free_names(struct audit_context *context)
 {
 	struct audit_names *n, *next;
 
+	if (list_empty(&context->names_list))
+		return;	/* audit_alloc_name() has not been called */
+
 	list_for_each_entry_safe(n, next, &context->names_list, list) {
 		list_del(&n->list);
 		if (n->name)
-- 
2.52.0