From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: linux-arm-kernel@lists.infradead.org,
linaro-mm-sig@lists.linaro.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org,
Kyungmin Park <kyungmin.park@samsung.com>,
Arnd Bergmann <arnd@arndb.de>,
Chunsang Jeong <chunsang.jeong@linaro.org>,
Krishna Reddy <vdumpa@nvidia.com>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Hiroshi Doyu <hdoyu@nvidia.com>,
Subash Patel <subashrp@gmail.com>
Subject: Re: [PATCH 4/4] ARM: remove consistent dma region and use common vmalloc range for dma allocations
Date: Fri, 13 Apr 2012 19:38:13 +0100 [thread overview]
Message-ID: <20120413183813.GO24211@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <1334325950-7881-5-git-send-email-m.szyprowski@samsung.com>
On Fri, Apr 13, 2012 at 04:05:50PM +0200, Marek Szyprowski wrote:
> This patch changes dma-mapping subsystem to use generic vmalloc areas
> for all consistent dma allocations. This increases the total size limit
> of the consistent allocations and removes platform hacks and a lot of
> duplicated code.
NAK. I don't think you appreciate the contexts from which the dma coherent
code can be called from, and the reason why we pre-allocate the page
tables (so that IRQ-based allocations work.)
The vmalloc region doesn't allow that because page tables are allocated
using GFP_KERNEL not GFP_ATOMIC.
Sorry.
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next prev parent reply other threads:[~2012-04-13 18:38 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-13 14:05 [PATCH 0/4] ARM: replace custom consistent dma region with vmalloc Marek Szyprowski
2012-04-13 14:05 ` [PATCH 1/4] mm: vmalloc: use const void * for caller argument Marek Szyprowski
2012-04-13 14:05 ` [PATCH 2/4] mm: vmalloc: export find_vm_area() function Marek Szyprowski
2012-04-13 14:05 ` [PATCH 3/4] mm: vmalloc: add VM_DMA flag to indicate areas used by dma-mapping framework Marek Szyprowski
2012-04-13 14:05 ` [PATCH 4/4] ARM: remove consistent dma region and use common vmalloc range for dma allocations Marek Szyprowski
2012-04-13 18:38 ` Russell King - ARM Linux [this message]
2012-04-16 1:32 ` Minchan Kim
2012-04-17 18:18 ` KOSAKI Motohiro
2012-04-23 12:02 ` [Linaro-mm-sig] [PATCH 0/4] ARM: replace custom consistent dma region with vmalloc Abhinav Kochhar
2012-04-23 20:58 ` Daniel Vetter
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