linux-kernel - [PATCH -next v7 3/5] md/bitmap: always wake up md_thread in timeout

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Message-Id: <20230425115256.3663932-4-yukuai1@huaweicloud.com>
Date:   Tue, 25 Apr 2023 19:52:54 +0800
From:   Yu Kuai <yukuai1@...weicloud.com>
To:     logang@...tatee.com, axboe@...nel.dk, song@...nel.org
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-raid@...r.kernel.org, yukuai3@...wei.com,
        yukuai1@...weicloud.com, yi.zhang@...wei.com, yangerkun@...wei.com
Subject: [PATCH -next v7 3/5] md/bitmap: always wake up md_thread in timeout_store

From: Yu Kuai <yukuai3@...wei.com>

md_wakeup_thread() can handle the case that pass in md_thread is NULL,
the only difference is that md_wakeup_thread() will be called when
current timeout is 'MAX_SCHEDULE_TIMEOUT', this should not matter
because timeout_store() is not hot path, and the daemon process is
woke up more than demand from other context already.

This patch prepare to factor out a helper to set timeout.

Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
 drivers/md/md-bitmap.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 920bb68156d2..06b980f71a6b 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -2475,11 +2475,11 @@ timeout_store(struct mddev *mddev, const char *buf, size_t len)
 		 * the bitmap is all clean and we don't need to
 		 * adjust the timeout right now
 		 */
-		if (mddev->thread->timeout < MAX_SCHEDULE_TIMEOUT) {
+		if (mddev->thread->timeout < MAX_SCHEDULE_TIMEOUT)
 			mddev->thread->timeout = timeout;
-			md_wakeup_thread(mddev->thread);
-		}
 	}
+
+	md_wakeup_thread(mddev->thread);
 	return len;
 }
 
-- 
2.39.2