linux-ext4 - Re: [PATCH] ext4: remove an unused variable warning with CONFIG

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Date:   Thu, 14 Oct 2021 11:26:04 +0200
From:   Jan Kara <jack@...e.cz>
To:     Austin Kim <austindh.kim@...il.com>
Cc:     tytso@....edu, adilger.kernel@...ger.ca,
        linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
        austin.kim@....com
Subject: Re: [PATCH] ext4: remove an unused variable warning with
 CONFIG_QUOTA=n

On Tue 24-08-21 04:49:29, Austin Kim wrote:
> The 'enable_quota' variable is only used in an CONFIG_QUOTA.
> With CONFIG_QUOTA=n, compiler causes a harmless warning:
> 
> fs/ext4/super.c: In function ‘ext4_remount’:
> fs/ext4/super.c:5840:6: warning: variable ‘enable_quota’ set but not used
>   [-Wunused-but-set-variable]
>   int enable_quota = 0;
>               ^~~~~
> 
> Move 'enable_quota' into the same #ifdef CONFIG_QUOTA block
> to remove an unused variable warning.
> 
> Signed-off-by: Austin Kim <austindh.kim@...il.com>

I guess this has fallen through the cracks. The fix looks good to me. Feel
free to add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  fs/ext4/super.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index 6b03e4281f6f..6adb570f4b31 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -5845,10 +5845,10 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
>  	struct ext4_sb_info *sbi = EXT4_SB(sb);
>  	unsigned long old_sb_flags, vfs_flags;
>  	struct ext4_mount_options old_opts;
> -	int enable_quota = 0;
>  	ext4_group_t g;
>  	int err = 0;
>  #ifdef CONFIG_QUOTA
> +	int enable_quota = 0;
>  	int i, j;
>  	char *to_free[EXT4_MAXQUOTAS];
>  #endif
> @@ -6053,7 +6053,9 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
>  					err = -EROFS;
>  					goto restore_opts;
>  				}
> +#ifdef CONFIG_QUOTA
>  			enable_quota = 1;
> +#endif
>  		}
>  	}
>  
> -- 
> 2.20.1
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR