linux-kernel - [PATCH 0/2] few memory hotplug fixes

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Message-Id: <20180523125555.30039-1-mhocko@kernel.org>
Date:   Wed, 23 May 2018 14:55:53 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Oscar Salvador <osalvador@...hadventures.net>,
        Vlastimil Babka <vbabka@...e.cz>,
        Pavel Tatashin <pasha.tatashin@...cle.com>,
        Reza Arbab <arbab@...ux.vnet.ibm.com>,
        Igor Mammedov <imammedo@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>
Subject: [PATCH 0/2] few memory hotplug fixes

[Resending with the mailing lists CCed - sorry for spamming]

Hi Andrew,
Oscar has reported two issue when playing with the memory hotplug
[1][2]. The first one seems more serious and patch 1 should address it.
In short we are overly optimistic about zone movable not containing any
non-movable pages and after 72b39cfc4d75 ("mm, memory_hotplug: do not
fail offlining too early") this can lead to a seemingly stuck (still
interruptible by a signal) memory offline.

Patch 2 fixes an over-eager warning which is not harmful but surely
annoying.

I know we are late in the release cycle but I guess both would be
candidates for rc7. They are simple enough and they should be
"obviously" correct. If you would like more time for them for testing
then I am perfectly fine postponing to the next merge window of course.

[1] http://lkml.kernel.org/r/20180523073547.GA29266@techadventures.net
[2] http://lkml.kernel.org/r/20180523080108.GA30350@techadventures.net

Michal Hocko (2):
      mm, memory_hotplug: make has_unmovable_pages more robust
      mm: do not warn on offline nodes unless the specific node is explicitly requested

Diffstat
 include/linux/gfp.h |  2 +-
 mm/page_alloc.c     | 16 ++++++++++------
 2 files changed, 11 insertions(+), 7 deletions(-)