linux-kernel - Re: [PATCH] fs: wipe off the compiler warn

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Date:	Sat, 30 Jul 2016 10:38:36 +0800
From:	zhong jiang <zhongjiang@...wei.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] fs: wipe off the compiler warn

On 2016/7/30 7:02, Andrew Morton wrote:
> On Fri, 29 Jul 2016 22:46:39 +0800 zhongjiang <zhongjiang@...wei.com> wrote:
>
>> From: zhong jiang <zhongjiang@...wei.com>
>>
>> when compile the kenrel code, I happens to the following warn.
>> fs/reiserfs/ibalance.c:1156:2: warning: ___new_insert_key___ may be used
>> uninitialized in this function.
>> memcpy(new_insert_key_addr, &new_insert_key, KEY_SIZE);
>> ^
>> The patch just fix it to avoid the warn.
>>
>> Signed-off-by: zhong jiang <zhongjiang@...wei.com>
>> ---
>>  fs/reiserfs/ibalance.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/fs/reiserfs/ibalance.c b/fs/reiserfs/ibalance.c
>> index b751eea..512ce95 100644
>> --- a/fs/reiserfs/ibalance.c
>> +++ b/fs/reiserfs/ibalance.c
>> @@ -818,7 +818,7 @@ int balance_internal(struct tree_balance *tb,
>>  	int order;
>>  	int insert_num, n, k;
>>  	struct buffer_head *S_new;
>> -	struct item_head new_insert_key;
>> +	struct item_head uninitialized_var(new_insert_key);
>>  	struct buffer_head *new_insert_ptr = NULL;
>>  	struct item_head *new_insert_key_addr = insert_key;
> How do we know this isn't a real bug?  It isn't obvious to me that this
> warning is a false positive.
>
>
> .
>
  yes ,it maybe a real bug, I will resend it in v2.