linux-kernel - [PATCH] remove the pointless BUG_ON(!task) from wake_up

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Date:   Mon, 10 May 2021 18:15:22 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: [PATCH] remove the pointless BUG_ON(!task) from wake_up_q()

because it looks very confusing (to me at least). It is equivalent to
BUG_ON(node == offsetof(struct task_struct, wake_q)), unlikely this is
what we actually want to check.

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
---
 kernel/sched/core.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 5226cc26a095..61d1d85bb93d 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -585,7 +585,6 @@ void wake_up_q(struct wake_q_head *head)
 		struct task_struct *task;
 
 		task = container_of(node, struct task_struct, wake_q);
-		BUG_ON(!task);
 		/* Task can safely be re-inserted now: */
 		node = node->next;
 		task->wake_q.next = NULL;
-- 
2.25.1.362.g51ebf55