linux-kernel - Re: [PATCH v1 1/1] mm/ksm: fix inconsistent accounting of zero pages

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Date:   Thu, 5 Apr 2018 15:50:02 +0200
From:   Greg KH <greg@...ah.com>
To:     Claudio Imbrenda <imbrenda@...ux.vnet.ibm.com>
Cc:     linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
        aarcange@...hat.com, minchan@...nel.org,
        kirill.shutemov@...ux.intel.com, linux-mm@...ck.org,
        hughd@...gle.com, borntraeger@...ibm.com,
        gerald.schaefer@...ibm.com, stable@...r.kernel.org
Subject: Re: [PATCH v1 1/1] mm/ksm: fix inconsistent accounting of zero pages

On Thu, Apr 05, 2018 at 02:27:54PM +0200, Claudio Imbrenda wrote:
> When using KSM with use_zero_pages, we replace anonymous pages
> containing only zeroes with actual zero pages, which are not anonymous.
> We need to do proper accounting of the mm counters, otherwise we will
> get wrong values in /proc and a BUG message in dmesg when tearing down
> the mm.
> 
> Fixes: e86c59b1b1 ("mm/ksm: improve deduplication of zero pages with colouring")
> 
> Signed-off-by: Claudio Imbrenda <imbrenda@...ux.vnet.ibm.com>
> ---
>  mm/ksm.c | 7 +++++++
>  1 file changed, 7 insertions(+)

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>