From mboxrd@z Thu Jan 1 00:00:00 1970 From: mina86@mina86.com (Michal Nazarewicz) Date: Fri, 24 Oct 2014 18:26:58 +0200 Subject: [PATCH v2 3/4] mm: cma: Ensure that reservations never cross the low/high mem boundary In-Reply-To: <1414145922-26042-4-git-send-email-laurent.pinchart+renesas@ideasonboard.com> References: <1414145922-26042-1-git-send-email-laurent.pinchart+renesas@ideasonboard.com> <1414145922-26042-4-git-send-email-laurent.pinchart+renesas@ideasonboard.com> Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Fri, Oct 24 2014, Laurent Pinchart 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 Acked-by: Michal Nazarewicz