linux-kernel - Re: [PATCH] fs: ubifs: Replace kmem_cache_alloc/memset with kmem_cache

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Date:	Thu, 26 May 2016 15:59:10 +0200
From:	Richard Weinberger <richard@....at>
To:	Salah Triki <salah.triki@....org>, dedekind1@...il.com,
	adrian.hunter@...el.com
Cc:	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fs: ubifs: Replace kmem_cache_alloc/memset with
 kmem_cache_zalloc

Am 26.05.2016 um 00:04 schrieb Salah Triki:
> Use kmem_cache_zalloc instead of kmem_cache_alloc/memset.
> 
> Signed-off-by: Salah Triki <salah.triki@....org>
> ---
>  fs/ubifs/super.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
> index 7034995..f509200 100644
> --- a/fs/ubifs/super.c
> +++ b/fs/ubifs/super.c
> @@ -262,12 +262,10 @@ static struct inode *ubifs_alloc_inode(struct super_block *sb)
>  {
>  	struct ubifs_inode *ui;
>  
> -	ui = kmem_cache_alloc(ubifs_inode_slab, GFP_NOFS);
> +	ui = kmem_cache_zalloc(ubifs_inode_slab, GFP_NOFS);
>  	if (!ui)
>  		return NULL;
>  
> -	memset((void *)ui + sizeof(struct inode), 0,
> -	       sizeof(struct ubifs_inode) - sizeof(struct inode));

Your patch fails to explain why it is needed.
Also note that the path slightly changes the semantics.

Thanks,
//richard