linux-kernel - Re: [PATCH 1/6] f2fs: fix the compiler warning for uninitialized use of variable

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Date:	Mon, 03 Dec 2012 07:56:11 +0900
From:	Jaegeuk Kim <jaegeuk.kim@...sung.com>
To:	Namjae Jeon <linkinjeon@...il.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Namjae Jeon <namjae.jeon@...sung.com>,
	Pankaj Kumar <pankaj.km@...sung.com>,
	linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [PATCH 1/6] f2fs: fix the compiler warning for uninitialized use
 of variable

Please, add CC: linux-f2fs-devel@...ts.sourceforge.net

Thank you for contribution to f2fs.
Looks good, and I'll merge them.
Thanks,

2012-12-01 (토), 10:55 +0900, Namjae Jeon:
> From: Namjae Jeon <namjae.jeon@...sung.com>
> 
> When CONFIG_CC_OPTIMIZE_FOR_SIZE is enabled in the kernel, -Os optimisation
> flag is passed to gcc for compilation, and somehow while trying to optimize
> the code, compiler is might not able to see the initialisation of variable
> ne struct variable inside the get_node_info() function and results into
> following warning:
> 
> fs/f2fs/node.c: In function 'get_node_info':
> fs/f2fs/node.c:175:3: warning: 'ne.block_addr' may be used uninitialized in
> this function [-Wuninitialized]
> fs/f2fs/node.c:265:24: note: 'ne.block_addr' was declared here
> fs/f2fs/node.c:176:3: warning: 'ne.ino' may be used uninitialized in this
> function [-Wuninitialized]
> fs/f2fs/node.c:265:24: note: 'ne.ino' was declared here
> fs/f2fs/node.c:177:3: warning: 'ne.version' may be used uninitialized in
> this function [-Wuninitialized]
> fs/f2fs/node.c:265:24: note: 'ne.version' was declared here
> 
> Hence, lets initialise the ne struct variable to zero, which will remove
> this warning and also doing this does not seems to making any impact on the
> code behavior.
> 
> Signed-off-by: Namjae Jeon <namjae.jeon@...sung.com>
> Signed-off-by: Pankaj Kumar <pankaj.km@...sung.com>
> ---
>  fs/f2fs/node.c |    1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
> index 25d3036..1987036 100644
> --- a/fs/f2fs/node.c
> +++ b/fs/f2fs/node.c
> @@ -266,6 +266,7 @@ void get_node_info(struct f2fs_sb_info *sbi, nid_t nid, struct node_info *ni)
>  	struct nat_entry *e;
>  	int i;
>  
> +	memset(&ne, 0, sizeof(struct f2fs_nat_entry));
>  	ni->nid = nid;
>  
>  	/* Check nat cache */

-- 
Jaegeuk Kim
Samsung

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