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Date: Tue, 11 Nov 2008 14:39:18 +0900 From: Yasunori Goto <y-goto@...fujitsu.com> To: Christoph Lameter <cl@...ux-foundation.org> Cc: "Luck, Tony" <tony.luck@...el.com>, FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>, linux-ia64@...r.kernel.org, Linux Kernel ML <linux-kernel@...r.kernel.org>, Joerg Roedel <joerg.roedel@....com> Subject: Re: [Q] Why does dma_alloc_coherent() of ia64 GFP_DMA? > On Mon, 10 Nov 2008, Yasunori Goto wrote: > > > Even if a device allows over 4G access and the driver doesn't specify > > GFP_DMA, dma_alloc_coherent() returns under 4G area. > > GFP_DMA can become 0 for configurations that have > !CONFIG_ZONE_DMA. Then all of memory is available. > > The call is subarch specific. So f.e. Altix sn_dma_alloc_coherent does > not set __GFP_DMA. I heard that Altix has IOMMU and __GFP_DMA is not necessary. > If you have an IA64 arch that only support 32bit I/O then __GFP_DMA in > dma_alloc_coherent makes sense. Agree. But our box supports both of 32bit I/O and 64bit I/O without IOMMU. Is it abnormal platform? New interface is necessary for our box like Altix? Bye. -- Yasunori Goto -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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