linux-kernel - [PATCH v2 2/3] sched: Introduce a local variable in abort_exclusive

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Date:	Fri, 5 Aug 2016 16:09:25 -0700
From:	Bart Van Assche <bart.vanassche@...disk.com>
To:	Ingo Molnar <mingo@...nel.org>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Oleg Nesterov <oleg@...hat.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Neil Brown <neilb@...e.de>,
	Michael Shaver <jmshaver@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 2/3] sched: Introduce a local variable in
 abort_exclusive_wait()

This patch does not change any functionality.

Signed-off-by: Bart Van Assche <bart.vanassche@...disk.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: Neil Brown <neilb@...e.de>
Cc: Michael Shaver <jmshaver@...il.com>
---
 kernel/sched/wait.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/kernel/sched/wait.c b/kernel/sched/wait.c
index fa12939..dcc7693 100644
--- a/kernel/sched/wait.c
+++ b/kernel/sched/wait.c
@@ -429,18 +429,20 @@ int __sched
 __wait_on_bit_lock(wait_queue_head_t *wq, struct wait_bit_queue *q,
 			wait_bit_action_f *action, unsigned mode)
 {
+	struct wait_bit_key *const key = &q->key;
+
 	do {
 		int ret;
 
 		prepare_to_wait_exclusive(wq, &q->wait, mode);
-		if (!test_bit(q->key.bit_nr, q->key.flags))
+		if (!test_bit(key->bit_nr, key->flags))
 			continue;
-		ret = action(&q->key, mode);
+		ret = action(key, mode);
 		if (!ret)
 			continue;
-		abort_exclusive_wait(wq, &q->wait, mode, &q->key);
+		abort_exclusive_wait(wq, &q->wait, mode, key);
 		return ret;
-	} while (test_and_set_bit(q->key.bit_nr, q->key.flags));
+	} while (test_and_set_bit(key->bit_nr, key->flags));
 	finish_wait(wq, &q->wait);
 	return 0;
 }
-- 
2.9.2