linux-kernel - Re: [PATCH] nilfs: avoid warning about unused variables

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Message-Id: <20160616.070532.298289408681530745.konishi.ryusuke@lab.ntt.co.jp>
Date:	Thu, 16 Jun 2016 07:05:32 +0900 (JST)
From:	Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-nilfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] nilfs: avoid warning about unused variables

On Wed, 15 Jun 2016 22:19:41 +0200, Arnd Bergmann <arnd@...db.de> wrote:
> The newly added nilfs_msg() infrastructure caused a warning in
> nilfs_clear_dirty_page() when it is disabled:
> 
> fs/nilfs2/page.c: In function 'nilfs_clear_dirty_page':
> fs/nilfs2/page.c:402:22: error: unused variable 'sb' [-Werror=unused-variable]
>   struct super_block *sb = inode->i_sb;
> 
> We can avoid the warning by adding a cast to void for the first
> argument of the macro.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Fixes: aede53d223f0 ("nilfs2: replace nilfs_warning() with nilfs_msg()")

Thanks for the catch!

Regards,
Ryusuke Konishi


> ---
>  fs/nilfs2/nilfs.h | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/nilfs2/nilfs.h b/fs/nilfs2/nilfs.h
> index b7064faef217..46fbd4e00315 100644
> --- a/fs/nilfs2/nilfs.h
> +++ b/fs/nilfs2/nilfs.h
> @@ -317,7 +317,10 @@ void __nilfs_error(struct super_block *sb, const char *function,
>  #else
>  
>  #define nilfs_msg(sb, level, fmt, ...)					\
> -	no_printk(fmt, ##__VA_ARGS__)
> +	do {								\
> +		no_printk(fmt, ##__VA_ARGS__);				\
> +		(void)(sb);						\
> +	} while (0)
>  #define nilfs_error(sb, fmt, ...)					\
>  	do {								\
>  		no_printk(fmt, ##__VA_ARGS__);				\
> -- 
> 2.9.0
> 
> --
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