linux-kernel - Re: [PATCH -mm] mm, swap: Fix bad swap file entry warning

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Message-ID: <87tvda40wq.fsf@yhuang-dev.intel.com>
Date:   Sat, 01 Jun 2019 08:14:29 +0800
From:   "Huang\, Ying" <ying.huang@...el.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Andrea Parri <andrea.parri@...rulasolutions.com>,
        "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
        Minchan Kim <minchan@...nel.org>,
        Hugh Dickins <hughd@...gle.com>
Subject: Re: [PATCH -mm] mm, swap: Fix bad swap file entry warning

Michal Hocko <mhocko@...nel.org> writes:

> On Fri 31-05-19 10:41:02, Huang, Ying wrote:
>> From: Huang Ying <ying.huang@...el.com>
>> 
>> Mike reported the following warning messages
>> 
>>   get_swap_device: Bad swap file entry 1400000000000001
>> 
>> This is produced by
>> 
>> - total_swapcache_pages()
>>   - get_swap_device()
>> 
>> Where get_swap_device() is used to check whether the swap device is
>> valid and prevent it from being swapoff if so.  But get_swap_device()
>> may produce warning message as above for some invalid swap devices.
>> This is fixed via calling swp_swap_info() before get_swap_device() to
>> filter out the swap devices that may cause warning messages.
>> 
>> Fixes: 6a946753dbe6 ("mm/swap_state.c: simplify total_swapcache_pages() with get_swap_device()")
>
> I suspect this is referring to a mmotm patch right?

Yes.

> There doesn't seem
> to be any sha like this in Linus' tree AFAICS. If that is the case then
> please note that mmotm patch showing up in linux-next do not have a
> stable sha1 and therefore you shouldn't reference them in the commit
> message. Instead please refer to the specific mmotm patch file so that
> Andrew knows it should be folded in to it.

Thanks for reminding!  I will be more careful in the future.  It seems
that Andrew has identified the right patch to be folded into.

Best Regards,
Huang, Ying