linux-kernel - Re: [PATCH] CMA: Don't return a valid cma for non-cma dev

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Message-ID: <xa1toaisrzih.fsf@mina86.com>
Date:	Fri, 31 Jul 2015 19:46:30 +0200
From:	Michal Nazarewicz <mina86@...a86.com>
To:	Feng Tang <feng.tang@...el.com>
Cc:	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	"m.szyprowski\@samsung.com" <m.szyprowski@...sung.com>,
	"kyungmin.park\@samsung.com" <kyungmin.park@...sung.com>,
	"akpm\@linux-foundation.org" <akpm@...ux-foundation.org>,
	"iamjoonsoo.kim\@lge.com" <iamjoonsoo.kim@....com>
Subject: Re: [PATCH] CMA: Don't return a valid cma for non-cma dev

On Fri, Jul 31 2015, Feng Tang wrote:
> Maybe I didn't make my problem clear, for our platform, we do need to
> use cma as we have camera ISP which has no IOMMU, so we cannot set
> "cma=0".

Then specify a CMA region for the camera in platform initialisation code
or device trees or whatever else is the rave nowadays.

I’m assuming that you have a piece of code (or configuration of some
sort) that assigns a CMA region to the device (otherwise ‘dev->cma_area’
would be NULL and your patch would just always get you NULL CMA area).
Simply create a CMA area there and assign it to the device.

-- 
Best regards,                                         _     _
.o. | Liege of Serenely Enlightened Majesty of      o' \,=./ `o
..o | Computer Science,  Michał “mina86” Nazarewicz    (o o)
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