linux-kernel - Re: [PATCH 2/7] kernfs: Drop unnecessary "mutex" local variable initialization

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Date:   Tue, 23 Aug 2022 13:15:56 +0800
From:   Chengming Zhou <zhouchengming@...edance.com>
To:     Tejun Heo <tj@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Johannes Weiner <hannes@...xchg.org>,
        Imran Khan <imran.f.khan@...cle.com>, kernel-team@...com
Subject: Re: [PATCH 2/7] kernfs: Drop unnecessary "mutex" local variable
 initialization

On 2022/8/20 08:05, Tejun Heo wrote:
> These are unnecessary and unconventional. Remove them. Also move variable
> declaration into the block that it's used. No functional changes.
> 

Reviewed-by: Chengming Zhou <zhouchengming@...edance.com>

Thanks.

> Signed-off-by: Tejun Heo <tj@...nel.org>
> Cc: Imran Khan <imran.f.khan@...cle.com>
> ---
>  fs/kernfs/file.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/kernfs/file.c b/fs/kernfs/file.c
> index 32b16fe00a9e..6437f7c7162d 100644
> --- a/fs/kernfs/file.c
> +++ b/fs/kernfs/file.c
> @@ -555,7 +555,7 @@ static int kernfs_get_open_node(struct kernfs_node *kn,
>  				struct kernfs_open_file *of)
>  {
>  	struct kernfs_open_node *on, *new_on = NULL;
> -	struct mutex *mutex = NULL;
> +	struct mutex *mutex;
>  
>  	mutex = kernfs_open_file_mutex_lock(kn);
>  	on = kernfs_deref_open_node_locked(kn);
> @@ -599,7 +599,7 @@ static void kernfs_unlink_open_file(struct kernfs_node *kn,
>  				 struct kernfs_open_file *of)
>  {
>  	struct kernfs_open_node *on;
> -	struct mutex *mutex = NULL;
> +	struct mutex *mutex;
>  
>  	mutex = kernfs_open_file_mutex_lock(kn);
>  
> @@ -776,9 +776,10 @@ static int kernfs_fop_release(struct inode *inode, struct file *filp)
>  {
>  	struct kernfs_node *kn = inode->i_private;
>  	struct kernfs_open_file *of = kernfs_of(filp);
> -	struct mutex *mutex = NULL;
>  
>  	if (kn->flags & KERNFS_HAS_RELEASE) {
> +		struct mutex *mutex;
> +
>  		mutex = kernfs_open_file_mutex_lock(kn);
>  		kernfs_release_file(kn, of);
>  		mutex_unlock(mutex);
> @@ -796,7 +797,7 @@ void kernfs_drain_open_files(struct kernfs_node *kn)
>  {
>  	struct kernfs_open_node *on;
>  	struct kernfs_open_file *of;
> -	struct mutex *mutex = NULL;
> +	struct mutex *mutex;
>  
>  	if (!(kn->flags & (KERNFS_HAS_MMAP | KERNFS_HAS_RELEASE)))
>  		return;