linux-kernel - [PATCH] fs: annotate cdev_lock with __cacheline_aligned_in

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Message-ID: <20251203095508.291073-1-mjguzik@gmail.com>
Date: Wed,  3 Dec 2025 10:55:08 +0100
From: Mateusz Guzik <mjguzik@...il.com>
To: brauner@...nel.org
Cc: viro@...iv.linux.org.uk,
	jack@...e.cz,
	linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	Mateusz Guzik <mjguzik@...il.com>
Subject: [PATCH] fs: annotate cdev_lock with __cacheline_aligned_in_smp

No need for the crapper to be susceptible to false-sharing.

Signed-off-by: Mateusz Guzik <mjguzik@...il.com>
---
 fs/char_dev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/char_dev.c b/fs/char_dev.c
index c2ddb998f3c9..84a5a0699373 100644
--- a/fs/char_dev.c
+++ b/fs/char_dev.c
@@ -343,7 +343,7 @@ void __unregister_chrdev(unsigned int major, unsigned int baseminor,
 	kfree(cd);
 }
 
-static DEFINE_SPINLOCK(cdev_lock);
+static __cacheline_aligned_in_smp DEFINE_SPINLOCK(cdev_lock);
 
 static struct kobject *cdev_get(struct cdev *p)
 {
-- 
2.48.1