linux-kernel - Re: [PATCH] ext4: fix Wunused-but-set-variable warning in ext4_add

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Date:   Tue, 17 Dec 2019 22:46:18 +0800
From:   Yunfeng Ye <yeyunfeng@...wei.com>
To:     Ritesh Harjani <riteshh@...ux.ibm.com>, <tytso@....edu>,
        <adilger.kernel@...ger.ca>, <linux-ext4@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        "hushiyuan@...wei.com" <hushiyuan@...wei.com>,
        "linfeilong@...wei.com" <linfeilong@...wei.com>
Subject: Re: [PATCH] ext4: fix Wunused-but-set-variable warning in
 ext4_add_entry()



On 2019/12/17 22:38, Ritesh Harjani wrote:
> 
> 
> On 12/17/19 5:41 PM, Yunfeng Ye wrote:
>> Warning is found when compile with "-Wunused-but-set-variable":
>>
>> fs/ext4/namei.c: In function ‘ext4_add_entry’:
>> fs/ext4/namei.c:2167:23: warning: variable ‘sbi’ set but not used
>> [-Wunused-but-set-variable]
>>    struct ext4_sb_info *sbi;
>>                         ^~~
>> Fix this by moving the variable @sbi under CONFIG_UNICODE.
>>
>> Signed-off-by: Yunfeng Ye <yeyunfeng@...wei.com>
> 
> Looks good to me. You may add:
> 
> Reviewed-by: Ritesh Harjani <riteshh@...ux.ibm.com>
> 
ok, thanks.

> 
> 
>> ---
>>   fs/ext4/namei.c | 4 +++-
>>   1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
>> index a856997d87b5..617349be460f 100644
>> --- a/fs/ext4/namei.c
>> +++ b/fs/ext4/namei.c
>> @@ -2164,7 +2164,9 @@ static int ext4_add_entry(handle_t *handle, struct dentry *dentry,
>>       struct buffer_head *bh = NULL;
>>       struct ext4_dir_entry_2 *de;
>>       struct super_block *sb;
>> +#ifdef CONFIG_UNICODE
>>       struct ext4_sb_info *sbi;
>> +#endif
>>       struct ext4_filename fname;
>>       int    retval;
>>       int    dx_fallback=0;
>> @@ -2176,12 +2178,12 @@ static int ext4_add_entry(handle_t *handle, struct dentry *dentry,
>>           csum_size = sizeof(struct ext4_dir_entry_tail);
>>
>>       sb = dir->i_sb;
>> -    sbi = EXT4_SB(sb);
>>       blocksize = sb->s_blocksize;
>>       if (!dentry->d_name.len)
>>           return -EINVAL;
>>
>>   #ifdef CONFIG_UNICODE
>> +    sbi = EXT4_SB(sb);
>>       if (ext4_has_strict_mode(sbi) && IS_CASEFOLDED(dir) &&
>>           sbi->s_encoding && utf8_validate(sbi->s_encoding, &dentry->d_name))
>>           return -EINVAL;
>>
> 
> 
> .
>