linux-kernel - Re: [PATCH] mm: Restore mmput

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Message-ID: <CAOUJ4O+NpiwTNeALOoH19DoBwv-HG3HvetrhuXY9weLXuo3bkQ@mail.gmail.com>
Date:   Wed, 13 Sep 2017 18:44:11 -0400
From:   Sherry Yang <sherryy@...roid.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org, Todd Kjos <tkjos@...gle.com>,
        Martijn Coenen <maco@...gle.com>,
        Arve Hjønnevåg <arve@...roid.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ingo Molnar <mingo@...nel.org>, Michal Hocko <mhocko@...e.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        David Rientjes <rientjes@...gle.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>,
        Oleg Nesterov <oleg@...hat.com>,
        Hoeun Ryu <hoeun.ryu@...il.com>,
        Christoph Lameter <cl@...ux.com>,
        Vegard Nossum <vegard.nossum@...cle.com>,
        Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH] mm: Restore mmput_async

The patch that uses mmput_async() is
https://lkml.org/lkml/2017/9/8/785. Gmail doesn't seem to respect
in-reply-to.

On Wed, Sep 13, 2017 at 6:09 PM, Andrew Morton
<akpm@...ux-foundation.org> wrote:
> On Wed, 13 Sep 2017 17:59:27 -0400 Sherry Yang <sherryy@...roid.com> wrote:
>
>> Restore asynchronous mmput, allowing mmput_async to be called
>> from an atomic context in Android binder shrinker callback.
>>
>> mmput_async was initially introduced in ec8d7c14e
>> ("mm, oom_reaper: do not mmput synchronously from the
>> oom reaper context"), and was removed in 212925802
>> ("mm: oom: let oom_reap_task and exit_mmap run concurrently")
>
> Presumably there's a patch somewhere which adds a call to mmput_async()
> into drivers/android/binder.c?  Where is that patch?