[PATCH] sched/wait: kill leftover bookmark logic in __wake_up_common()

[Oleg Nesterov <oleg@redhat.com>]

The manual list head check and list_for_each_entry_safe_from() in
__wake_up_common() are leftovers from commit 2554db916586 ("sched/wait:
Break up long wake list walk").

This logic was later removed by commit 37acade0ce89 ("sched: remove
wait bookmarks") but the now-unnecessary list hacks were left behind.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
---
 kernel/sched/wait.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/kernel/sched/wait.c b/kernel/sched/wait.c
index f8d6d8b9d03e..d0521b54eeb3 100644
--- a/kernel/sched/wait.c
+++ b/kernel/sched/wait.c
@@ -96,12 +96,7 @@ static int __wake_up_common(struct wait_queue_head *wq_head, unsigned int mode,
 
 	lockdep_assert_held(&wq_head->lock);
 
-	curr = list_first_entry(&wq_head->head, wait_queue_entry_t, entry);
-
-	if (&curr->entry == &wq_head->head)
-		return nr_exclusive;
-
-	list_for_each_entry_safe_from(curr, next, &wq_head->head, entry) {
+	list_for_each_entry_safe(curr, next, &wq_head->head, entry) {
 		unsigned flags = curr->flags;
 		int ret;
 
-- 
2.55.0