linux-kernel - [PATCH v2 0/4] Low/high memory CMA reservation fixes

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Date:	Fri, 24 Oct 2014 13:18:38 +0300
From:	Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
To:	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>,
	Michal Nazarewicz <mina86@...a86.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Weijie Yang <weijie.yang.kh@...il.com>
Subject: [PATCH v2 0/4] Low/high memory CMA reservation fixes

Hello,

This patch set fixes an issue introduced by commits 95b0e655f914 ("ARM: mm:
don't limit default CMA region only to low memory") and f7426b983a6a ("mm:
cma: adjust address limit to avoid hitting low/high memory boundary")
resulting in reserved areas crossing the low/high memory boundary.

Patches 1/4 and 2/4 fix sides issues, with the bulk of the work in patch 3/4.
Patch 4/4 then fixes a printk issue that got me puzzled wondering why memory
reported under the lowmem limit was actually highmem.

This series fixes a v3.18-rc1 regression causing Renesas Koelsch boot
breakages when CMA is enabled.

Changes since v1:

- Use the cma count field to detect non-activated reservations
- Remove the redundant limit adjustment

Laurent Pinchart (4):
  mm: cma: Don't crash on allocation if CMA area can't be activated
  mm: cma: Always consider a 0 base address reservation as dynamic
  mm: cma: Ensure that reservations never cross the low/high mem
    boundary
  mm: cma: Use %pa to print physical addresses

 mm/cma.c | 68 +++++++++++++++++++++++++++++++++++++++++-----------------------
 1 file changed, 44 insertions(+), 24 deletions(-)

-- 
Regards,

Laurent Pinchart

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