linux-kernel - Re: [PATCH -next] md: bcache: use DEFINE_MUTEX (and mutex

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Message-ID: <f2b123a2-ba10-cff0-0c55-2c6558f150ec@suse.de>
Date:   Wed, 23 Dec 2020 22:22:33 +0800
From:   Coly Li <colyli@...e.de>
To:     Zheng Yongjun <zhengyongjun3@...wei.com>,
        kent.overstreet@...il.com, linux-bcache@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] md: bcache: use DEFINE_MUTEX (and mutex_init() had
 been too late)

On 12/23/20 10:12 PM, Zheng Yongjun wrote:
> Signed-off-by: Zheng Yongjun <zhengyongjun3@...wei.com>

NACK. The commit log is necessary to explain why it is too late, IMHO I
don't find the implicit reason from the patch.

Coly Li

> ---
>  drivers/md/bcache/super.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
> index 46a00134a36a..963d62a15f37 100644
> --- a/drivers/md/bcache/super.c
> +++ b/drivers/md/bcache/super.c
> @@ -40,7 +40,7 @@ static const char invalid_uuid[] = {
>  };
>  
>  static struct kobject *bcache_kobj;
> -struct mutex bch_register_lock;
> +DEFINE_MUTEX(bch_register_lock);
>  bool bcache_is_reboot;
>  LIST_HEAD(bch_cache_sets);
>  static LIST_HEAD(uncached_devices);
> @@ -2832,7 +2832,6 @@ static int __init bcache_init(void)
>  
>  	check_module_parameters();
>  
> -	mutex_init(&bch_register_lock);
>  	init_waitqueue_head(&unregister_wait);
>  	register_reboot_notifier(&reboot);
>  
>