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Date: Wed, 20 Nov 2013 15:47:38 -0800
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Akinobu Mita <akinobu.mita@gmail.com>, linux-kernel@vger.kernel.org,
        akpm@linux-foundation.org
CC: Marek Szyprowski <m.szyprowski@samsung.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
        Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
        x86@kernel.org
Subject: Re: [PATCH] x86: enable DMA CMA with swiotlb
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On 11/19/2013 03:32 PM, Akinobu Mita wrote:
> The DMA Contiguous Memory Allocator support on x86 is disabled when
> swiotlb config option is enabled.  So DMA CMA is always disabled on
> x86_64 because swiotlb is always enabled.  This attempts to support
> for DMA CMA with enabling swiotlb config option.

What is the use case?

	-hpa