linux-kernel - Re: [PATCH -mm] mm, compaction: properly signal and act upon lock and need_sched() contention

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Message-ID: <CAOMZO5CCMwT9fPie1-JF+zqBfk4AYjuD43dwEEkRYqOjUPLN2w@mail.gmail.com>
Date:	Mon, 2 Jun 2014 12:18:34 -0300
From:	Fabio Estevam <festevam@...il.com>
To:	Vlastimil Babka <vbabka@...e.cz>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Shawn Guo <shawn.guo@...aro.org>,
	Kevin Hilman <khilman@...aro.org>,
	Rik van Riel <riel@...hat.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Minchan Kim <minchan@...nel.org>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Hugh Dickins <hughd@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Michal Nazarewicz <mina86@...a86.com>, linux-mm@...ck.org,
	Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Olof Johansson <olof@...om.net>,
	Greg Thelen <gthelen@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Christoph Lameter <cl@...ux.com>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH -mm] mm, compaction: properly signal and act upon lock and
 need_sched() contention - fix

On Mon, Jun 2, 2014 at 11:33 AM, Vlastimil Babka <vbabka@...e.cz> wrote:
> compact_should_abort() returns true instead of false and vice versa
> due to changes between v1 and v2 of the patch. This makes both async
> and sync compaction abort with high probability, and has been reported
> to cause e.g. soft lockups on some ARM boards, or drivers calling
> dma_alloc_coherent() fail to probe with CMA enabled on different boards.
>
> This patch fixes the return value to match comments and callers expecations.
>
> Reported-and-tested-by: Kevin Hilman <khilman@...aro.org>
> Reported-and-tested-by: Shawn Guo <shawn.guo@...aro.org>
> Tested-by: Stephen Warren <swarren@...dia.com>
> Signed-off-by: Vlastimil Babka <vbabka@...e.cz>

Tested-by: Fabio Estevam <fabio.estevam@...escale.com>
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