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

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Date:   Fri, 31 May 2019 09:59:00 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     "Huang, Ying" <ying.huang@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Andrea Parri <andrea.parri@...rulasolutions.com>,
        "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
        Michal Hocko <mhocko@...e.com>,
        Minchan Kim <minchan@...nel.org>,
        Hugh Dickins <hughd@...gle.com>
Subject: Re: [PATCH -mm] mm, swap: Fix bad swap file entry warning

On 5/30/19 7:41 PM, 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()")
> Signed-off-by: "Huang, Ying" <ying.huang@...el.com>

Thank you, this eliminates the messages for me:

Tested-by: Mike Kravetz <mike.kravetz@...cle.com>

-- 
Mike Kravetz