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Date: Wed, 10 Feb 2010 15:10:38 -0800 From: Abhijeet Dharmapurikar <adharmap@...eaurora.org> To: Russell King - ARM Linux <linux@....linux.org.uk> CC: Randy Dunlap <rdunlap@...otime.net>, linux-arm-kernel@...ts.infradead.org, linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org, Catalin Marinas <catalin.marinas@....com>, Abhijeet Dharmapurikar <adharmap@...cinc.com> Subject: Re: [RFC 0/2] fix dma_map_sg not to do barriers for each buffer Russell King - ARM Linux wrote: > On Wed, Feb 10, 2010 at 01:27:47PM -0800, Randy Dunlap wrote: >> On 02/10/10 12:37, adharmap@...eaurora.org wrote: >>> From: Abhijeet Dharmapurikar <adharmap@...cinc.com> >>> >>> Please refer to the post here >>> http://lkml.org/lkml/2010/1/4/347 >>> >>> These changes are to introduce barrierless dma_map_area and dma_unmap_area and >>> use them to map the buffers in the scatterlist. For the last buffer, call >>> the normal dma_map_area(aka with barriers) effectively executing the barrier >>> at the end of the operation. >>> >>> Note that the barrierless operations are implemented for few arm >>> architectures only and I would implement for others once these are okayed by the >>> community. >> So when you add these interfaces for other architectures, you will also >> update Documentation/DMA-API.txt, right?? > > Do we need barrier-less interfaces for anything other than the dma_*_sg > functions? I think, dma_*_sg are the only ones that could benefit from barrier-less interfaces. > -- > To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- 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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