From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7C3A71F19A; Sat, 26 Apr 2025 22:49:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745707775; cv=none; b=Z9v8AVidEdQ8uxljX2Caf0ffdwsN5hpZ6SekpAB4kkla5ql970oOHrPXRuqFyI50RCmHsHwS555NWaKQeYeB8Dgy1eQPRWtpWLns647lbCDZ4dgZq1a0aMRDEWX9dDxAmaasxrm+VfUaGAKUUhi+Aa9yxdzHBUh5LptW/k0WRnA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745707775; c=relaxed/simple; bh=nmMFwB0+2Q83FWwoIeN84/Hsbr1BD0MNyu6u3Ztzl+U=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=DqQOKcI6zcxF6ERRLfIwF0Pqqcxmj19j1V/6AweGhUfQ+E8C5qBPOnqxjxxW0FtCiwZA/A8ZoMNhsTI+3vu/v6l2ieBZWzDeZZ5vbRaXAMxNxmr03h0goddky9gi/InCEwbYkyRW2YpLMc+WTH5zokOV5yz7Hvd5on4rCMzXCAs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=dq4DN7sY; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="dq4DN7sY" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0E2A6C4CEE2; Sat, 26 Apr 2025 22:49:33 +0000 (UTC) DKIM-Signature: v=1; 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: Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: 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