linux-kernel - Re: [REF PATCH] mm/swap: fix swapon failure

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Date:   Mon, 9 Nov 2020 20:36:08 +0800
From:   Alex Shi <alex.shi@...ux.alibaba.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     linmiaohe@...wei.com, akpm@...ux-foundation.org,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Hugh Dickins <hughd@...gle.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [REF PATCH] mm/swap: fix swapon failure



在 2020/11/9 下午8:17, Alex Shi 写道:
> 
> 
> 在 2020/11/9 下午8:07, Matthew Wilcox 写道:
>> On Mon, Nov 09, 2020 at 07:47:16PM +0800, Alex Shi wrote:
>>> Go through the context I found the exit_swap_address_space(p->type)
>>> shouldn't be used in good result path. So just move it to error path.
>>
>> But ... it's not used in the success path.  There's a 'goto' right
>> before it.  Does this really fix your problem?
>>
> 
> The trick thing is. It do fix my problem on my centos 7 with gcc 8.3.1...
> 
> I am getting headache on this problem...

Checked again on my git tree. nothing weird, and code based on
cf7cd542d1b5 Add linux-next specific files for 20201104

Sorry, I have no idea where is the problem...


> 
>>> @@ -3339,7 +3339,8 @@ static bool swap_discardable(struct swap_info_struct *si)
>>>  	error = inode_drain_writes(inode);
>>>  	if (error) {
>>>  		inode->i_flags &= ~S_SWAPFILE;
>>> -		goto free_swap_address_space;
>>> +		exit_swap_address_space(p->type);
>>> +		goto bad_swap_unlock_inode;
>>>  	}
>>>  
>>>  	mutex_lock(&swapon_mutex);
>>> @@ -3364,8 +3365,6 @@ static bool swap_discardable(struct swap_info_struct *si)
>>>  
>>>  	error = 0;
>>>  	goto out;
>>> -free_swap_address_space:
>>> -	exit_swap_address_space(p->type);
>>>  bad_swap_unlock_inode:
>>>  	inode_unlock(inode);
>>>  bad_swap:
>>> -- 
>>> 1.8.3.1
>>>
>>>