linux-kernel - Re: [PATCH -next] 9p: Remove unneeded cast from memory allocation

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Message-ID: <20200731052421.GA22875@nautica>
Date:   Fri, 31 Jul 2020 07:24:21 +0200
From:   Dominique Martinet <asmadeus@...ewreck.org>
To:     Li Heng <liheng40@...wei.com>
Cc:     ericvh@...il.com, lucho@...kov.net,
        v9fs-developer@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] 9p: Remove unneeded cast from memory allocation

Li Heng wrote on Wed, Jul 29, 2020:
> Remove casting the values returned by memory allocation function.
> 
> Coccinelle emits WARNING:
> 
> ./fs/9p/vfs_inode.c:226:12-29: WARNING: casting value returned by memory allocation function to (struct v9fs_inode *) is useless.
> 
> Signed-off-by: Li Heng <liheng40@...wei.com>

Why not, I'll take this for next.
Please pay a bit more attention to the commit message next time though,
neither "Remove casting the values" nor "x emits warning" are proper
English -- I've taken the liberty to fix the grammar a bit...

> ---
>  fs/9p/vfs_inode.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
> index 0fd5bf2..ae0c38a 100644
> --- a/fs/9p/vfs_inode.c
> +++ b/fs/9p/vfs_inode.c
> @@ -223,8 +223,7 @@ v9fs_blank_wstat(struct p9_wstat *wstat)
>  struct inode *v9fs_alloc_inode(struct super_block *sb)
>  {
>  	struct v9fs_inode *v9inode;
> -	v9inode = (struct v9fs_inode *)kmem_cache_alloc(v9fs_inode_cache,
> -							GFP_KERNEL);
> +	v9inode = kmem_cache_alloc(v9fs_inode_cache, GFP_KERNEL);
>  	if (!v9inode)
>  		return NULL;
>  #ifdef CONFIG_9P_FSCACHE