linux-kernel - Re: [PATCH] z3fold: limit use of stale list for allocation

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Message-Id: <20180216162809.30b2278f0cacefa66c95c1aa@linux-foundation.org>
Date:   Fri, 16 Feb 2018 16:28:09 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Vitaly Wool <vitalywool@...il.com>
Cc:     Linux-MM <linux-mm@...ck.org>, linux-kernel@...r.kernel.org,
        Oleksiy.Avramchenko@...y.com
Subject: Re: [PATCH] z3fold: limit use of stale list for allocation

On Sat, 10 Feb 2018 12:02:52 +0100 Vitaly Wool <vitalywool@...il.com> wrote:

> Currently if z3fold couldn't find an unbuddied page it would first
> try to pull a page off the stale list. The problem with this
> approach is that we can't 100% guarantee that the page is not
> processed by the workqueue thread at the same time unless we run
> cancel_work_sync() on it, which we can't do if we're in an atomic
> context. So let's just limit stale list usage to non-atomic
> contexts only.

This smells like a bugfix.  What are the end-user visible effects of
the bug?