linux-kernel - [RFC 0/2] do not depend on cpuhotplug logs in lru_add_drain

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Date:   Thu,  2 Nov 2017 10:36:11 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     <linux-mm@...ck.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Johannes Weiner <hannes@...xchg.org>,
        Mel Gorman <mgorman@...e.de>, Tejun Heo <tj@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [RFC 0/2] do not depend on cpuhotplug logs in lru_add_drain_all 

Hi,
this is an RFC to drop get_online_cpus from lru_add_drain_all ad this
has caused a very subtle lockdep splats recently [1]. I didn't get even
to properly test this yet and I am sending it early to check whether the
thinking behind is sound. I am basically following the same pattern we
have used for removing get_online_cpus from drain_all_pages which should
be the similar case.

Does anybody see any obvious problem?

[1] http://lkml.kernel.org/r/089e0825eec8955c1f055c83d476@google.com