linux-kernel - Re: [PATCH 1/4] mm: cma: Don't crash on allocation if CMA area can't be activated

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Date:	Fri, 24 Oct 2014 12:54:08 +0300
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>
Cc:	Weijie Yang <weijie.yang.kh@...il.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
	linux-mm@...ck.org, 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>
Subject: Re: [PATCH 1/4] mm: cma: Don't crash on allocation if CMA area can't be activated

Hello,

On Friday 24 October 2014 11:50:14 Joonsoo Kim wrote:
> On Fri, Oct 24, 2014 at 10:02:49AM +0800, Weijie Yang wrote:
> > On Fri, Oct 24, 2014 at 7:42 AM, Laurent Pinchart wrote:
> > > On Thursday 23 October 2014 18:53:36 Michal Nazarewicz wrote:
> > >> On Thu, Oct 23 2014, Laurent Pinchart wrote:
> > >> > If activation of the CMA area fails its mutex won't be initialized,
> > >> > leading to an oops at allocation time when trying to lock the mutex.
> > >> > Fix this by failing allocation if the area hasn't been successfully
> > >> > actived, and detect that condition by moving the CMA bitmap
> > >> > allocation after page block reservation completion.
> > >> > 
> > >> > Signed-off-by: Laurent Pinchart
> > >> > <laurent.pinchart+renesas@...asonboard.com>
> > >> 
> > >> Cc: <stable@...r.kernel.org>  # v3.17
> > >> Acked-by: Michal Nazarewicz <mina86@...a86.com>
> > 
> > This patch is good, but how about add a active field in cma struct?
> > use cma->active to check whether cma is actived successfully.
> > I think it will make code more clear and readable.
> > Just my little opinion.
> 
> Or just setting cma->count to 0 would work fine.

I would prefer setting cma->count to 0 to avoid the extra field. I'll modify 
the patch accordingly.

-- 
Regards,

Laurent Pinchart

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