linux-kernel - Re: [STABLE PATCH] slub: make ->cpu

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Message-ID: <01000166354231f3-1e953571-f9ec-4a73-a228-ff3692825b41-000000@email.amazonses.com>
Date:   Tue, 2 Oct 2018 14:50:22 +0000
From:   Christopher Lameter <cl@...ux.com>
To:     Matthew Wilcox <willy@...radead.org>
cc:     Greg KH <gregkh@...ux-foundation.org>,
        zhong jiang <zhongjiang@...wei.com>, penberg@...nel.org,
        rientjes@...gle.com, iamjoonsoo.kim@....com,
        akpm@...ux-foundation.org, mhocko@...nel.org, mgorman@...e.de,
        vbabka@...e.cz, andrea@...nel.org, kirill@...temov.name,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [STABLE PATCH] slub: make ->cpu_partial unsigned int

On Sun, 30 Sep 2018, Matthew Wilcox wrote:

> > And the patch in mainline has Christoph's ack...
>
> I'm not saying there's a problem with the patch.  It's that the rationale
> for backporting doesn't make any damned sense.  There's something going
> on that nobody understands.  This patch is probably masking an underlying
> problem that will pop back up and bite us again someday.

Right. That is why I raised the issue. I do not see any harm in
backporting but I do not think it fixes the real issue which may be in
concurrent use of page struct fields that are overlapping.