From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx113.postini.com [74.125.245.113]) by kanga.kvack.org (Postfix) with SMTP id 60D266B0068 for ; Thu, 27 Sep 2012 18:12:01 -0400 (EDT) Date: Thu, 27 Sep 2012 15:11:59 -0700 From: Andrew Morton Subject: Re: CMA broken in next-20120926 Message-Id: <20120927151159.4427fc8f.akpm@linux-foundation.org> In-Reply-To: <20120927112911.GA25959@avionic-0098.mockup.avionic-design.de> References: <20120927112911.GA25959@avionic-0098.mockup.avionic-design.de> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Thierry Reding Cc: Marek Szyprowski , Michal Nazarewicz , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Bartlomiej Zolnierkiewicz , Kyungmin Park Marek Szyprowski Michal Nazarewicz , Minchan Kim , Mark Brown , Peter Ujfalusi On Thu, 27 Sep 2012 13:29:11 +0200 Thierry Reding wrote: > Hi Marek, > > any idea why CMA might be broken in next-20120926. I see that there > haven't been any major changes to CMA itself, but there's been quite a > bit of restructuring of various memory allocation bits lately. I wasn't > able to track the problem down, though. > > What I see is this during boot (with CMA_DEBUG enabled): > > [ 0.266904] cma: dma_alloc_from_contiguous(cma db474f80, count 64, align 6) > [ 0.284469] cma: dma_alloc_from_contiguous(): memory range at c09d7000 is busy, retrying > [ 0.293648] cma: dma_alloc_from_contiguous(): memory range at c09d7800 is busy, retrying > ... > [ 2.648619] DMA: failed to allocate 256 KiB pool for atomic coherent allocation > ... > [ 4.196193] WARNING: at /home/thierry.reding/src/kernel/linux-ipmp.git/arch/arm/mm/dma-mapping.c:485 __alloc_from_pool+0xdc/0x110() > [ 4.207988] coherent pool not initialised! > > So the pool isn't getting initialized properly because CMA can't get at > the memory. Do you have any hints as to what might be going on? If it's > any help, I started seeing this with next-20120926 and it is in today's > next as well. > Bart and Minchan have made recent changes to CMA. Let us cc them. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org