linux-kernel - Re: [Linaro-mm-sig] [PATCHv16 0/9] Contiguous Memory Allocator

Open Source and information security mailing list archives

Date:	Mon, 10 Oct 2011 07:02:17 -0500
From:	"Clark, Rob" <rob@...com>
To:	Ohad Ben-Cohen <ohad@...ery.com>
Cc:	Arnd Bergmann <arnd@...db.de>,
	linux-arm-kernel@...ts.infradead.org,
	Daniel Walker <dwalker@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Jonathan Corbet <corbet@....net>, Mel Gorman <mel@....ul.ie>,
	Chunsang Jeong <chunsang.jeong@...aro.org>,
	linux-kernel@...r.kernel.org,
	Michal Nazarewicz <mina86@...a86.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	linaro-mm-sig@...ts.linaro.org,
	Jesse Barker <jesse.barker@...aro.org>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Ankita Garg <ankita@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-media@...r.kernel.org, linux-mm@...ck.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [Linaro-mm-sig] [PATCHv16 0/9] Contiguous Memory Allocator

On Mon, Oct 10, 2011 at 1:58 AM, Ohad Ben-Cohen <ohad@...ery.com> wrote:
> On Fri, Oct 7, 2011 at 6:27 PM, Arnd Bergmann <arnd@...db.de> wrote:
>> IMHO it would be good to merge the entire series into 3.2, since
>> the ARM portion fixes an important bug (double mapping of memory
>> ranges with conflicting attributes) that we've lived with for far
>> too long, but it really depends on how everyone sees the risk
>> for regressions here. If something breaks in unfixable ways before
>> the 3.2 release, we can always revert the patches and have another
>> try later.
>
> I didn't thoroughly review the patches, but I did try them out (to be
> precise, I tried v15) on an OMAP4 PandaBoard, and really liked the
> result.
>
> The interfaces seem clean and convenient and things seem to work (I
> used a private CMA pool with rpmsg and remoteproc, but also noticed
> that several other drivers were utilizing the global pool). And with
> this in hand we can finally ditch the old reserve+ioremap approach.
>
> So from a user perspective, I sure do hope this patch set gets into
> 3.2; hopefully we can just fix anything that would show up during the
> 3.2 cycle.
>
> Marek, Michal (and everyone involved!), thanks so much for pushing
> this! Judging from the history of this patch set and the areas that it
> touches (and from the number of LWN articles ;) it looks like a
> considerable feat.
>
> FWIW, feel free to add my
>
> Tested-by: Ohad Ben-Cohen <ohad@...ery.com>

Marek, I guess I forgot to mention earlier, but I've been using CMA
for a couple of weeks now with omapdrm driver, so you can also add my:

Tested-by: Rob Clark <rob@...com>

BR,
-R

> (small and optional comment: I think it'd be nice if
> dma_declare_contiguous would fail if called too late, otherwise users
> of that misconfigured device will end up using the global pool without
> easily knowing that something went wrong)
>
> Thanks,
> Ohad.
>
> _______________________________________________
> Linaro-mm-sig mailing list
> Linaro-mm-sig@...ts.linaro.org
> http://lists.linaro.org/mailman/listinfo/linaro-mm-sig
>
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