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a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1745707774; bh=nmMFwB0+2Q83FWwoIeN84/Hsbr1BD0MNyu6u3Ztzl+U=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=dq4DN7sYvzyKsbFrdTgHJyYQ/t0IfLJyjoz6RDjDdoU+n+O0s9VMQ5Fe4sETqQqXu DCeQkOkzWcikGSsz5cSEC9TkTjmCk7WVtWRGMVFf+u/m2XaDyfr5iPT82X6WifKMG2 gh1V5xEEIy9jECtkpExskL33+bhy82ETGBU7hbmEoEGMpmALKALDa3hF5i3anZHhG3 jVXw8747itRVfwTZvsh4/6M7lMFtHzVL1MAcGeyBOA0lj2Rflt0Cr/LoaF/1k5b43X r6s70MJCK+obsUgmZqZbzwSqcw3Wt8+DvxNsviVfWn0igDvBWICqZ4yqkUwueY0OUR l+77ooG0Rb3eQ== Date: Sat, 26 Apr 2025 15:49:32 -0700 From: Luis Chamberlain To: Leon Romanovsky Cc: Marek Szyprowski , Jens Axboe , Christoph Hellwig , Keith Busch , Jake Edge , Jonathan Corbet , Jason Gunthorpe , Zhu Yanjun , Robin Murphy , Joerg Roedel , Will Deacon , Sagi Grimberg , Bjorn Helgaas , Logan Gunthorpe , Yishai Hadas , Shameer Kolothum , Kevin Tian , Alex Williamson , =?iso-8859-1?B?Suly9G1l?= Glisse , Andrew Morton , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, linux-rdma@vger.kernel.org, iommu@lists.linux.dev, linux-nvme@lists.infradead.org, linux-pci@vger.kernel.org, kvm@vger.kernel.org, linux-mm@kvack.org, Niklas Schnelle , Chuck Lever , Matthew Wilcox , Dan Williams , Kanchan Joshi , Chaitanya Kulkarni , Leon Romanovsky Subject: Re: [PATCH v9 08/24] dma-mapping: add a dma_need_unmap helper Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 19ADE40003 X-Stat-Signature: 5yitg1fjjpoefctt3qn7ogmi4kzsy5ey X-HE-Tag: 1745707775-842386 X-HE-Meta: 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 seGyvPn1 QRr+3nnifwPCVpmPC39uV9b4Yr+eakUAsz3EzudCsGQZvQW1E/r1bbYGMOAPHq5FBP5dXDVxHmC+vYL5p0CpR+emM9HI3nokEz1Ca0QH0jUI3xwqD95QZAp1gVrRmKUEQ0zFFkQAOy9LLKFXijHFP6wADfWBVrKOqjhj2DrebqGjIkrkp20gnaidQG/bEFwQuPeuWZfB51fBS/kh21D7QwDpPSeqBgVNUuxXACR1LZ07w14kzBx2MNG3wrVtpOxx04rO966vC1Byh6HVlDChi15HLmZ94k7WAwuhcmf/mZf7boLspsdjmNnZ/Kw== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, Apr 23, 2025 at 11:12:59AM +0300, Leon Romanovsky wrote: > From: Christoph Hellwig > > Add helper that allows a driver to skip calling dma_unmap_* > if the DMA layer can guarantee that they are no-nops. > > Signed-off-by: Christoph Hellwig > Tested-by: Jens Axboe > Signed-off-by: Leon Romanovsky Reviewed-by: Luis Chamberlain Luis