linux-kernel - Re: [PATCH v2 3/4] mm: cma: Ensure that reservations never cross the low/high mem boundary

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Message-ID: <xa1toat13031.fsf@mina86.com>
Date:	Fri, 24 Oct 2014 18:26:58 +0200
From:	Michal Nazarewicz <mina86@...a86.com>
To:	Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
	linux-mm@...ck.org
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-sh@...r.kernel.org,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Weijie Yang <weijie.yang.kh@...il.com>
Subject: Re: [PATCH v2 3/4] mm: cma: Ensure that reservations never cross the low/high mem boundary

On Fri, Oct 24 2014, Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com> wrote:
> Commit 95b0e655f914 ("ARM: mm: don't limit default CMA region only to
> low memory") extended CMA memory reservation to allow usage of high
> memory. It relied on commit f7426b983a6a ("mm: cma: adjust address limit
> to avoid hitting low/high memory boundary") to ensure that the reserved
> block never crossed the low/high memory boundary. While the
> implementation correctly lowered the limit, it failed to consider the
> case where the base..limit range crossed the low/high memory boundary
> with enough space on each side to reserve the requested size on either
> low or high memory.
>
> Rework the base and limit adjustment to fix the problem. The function
> now starts by rejecting the reservation altogether for fixed
> reservations that cross the boundary, tries to reserve from high memory
> first and then falls back to low memory.
>
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>

Acked-by: Michal Nazarewicz <mina86@...a86.com>
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