From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 6ED73FD8FF2 for ; Thu, 26 Feb 2026 18:20:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:Mime-Version:References:In-Reply-To:Message-Id:Subject:Cc:To: From:Date:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=WXiOIvtk26yYWNJ1hVlQ8tpZw7Zqs8QSW7JOhqMXK5A=; b=bBR/nSgyZ+IbTurHJxfqK2H9ti hxbHmkowSNFxWVkTA06wniU5ICW3xt6F65nGAjCAg/VrE0tFY1Vq4EX/gwYKJstbB9MW3XLFmzQn+ o44RpkrxIeq0ru0tvWRx8TCNSw9DxQq3JFK4m0xUw5+Xw3v11yQJi2MMoq9fc0xfjBIKqb6zG7R6z 8P2XKjeRSa4ONpE/ucNjJerSwWf46ZSNLBZ4hL6NUQAavIUR2d2UtAiMHoD+D9dZ4H868dcEvKSsp OP4HjaFdhc5f8u4wf7pKRwqc0sNPy4P4VyscZ74xD/cfTlC5gizQkma8CgphvLxUvbwzzC4WEHBJb r1JJxzDw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vvfye-00000006x0d-0yoQ; Thu, 26 Feb 2026 18:20:44 +0000 Received: from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vvfya-00000006wzm-31jN; Thu, 26 Feb 2026 18:20:41 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 93D1641A62; Thu, 26 Feb 2026 18:20:39 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id BC48BC116C6; Thu, 26 Feb 2026 18:20:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1772130039; bh=HV1S/qrSmKMNPz1JBIra1UdVobFVeWulvDlaZO10nbE=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=PabnRhzU6AHT18WWRNM+FYnoFqe+hChSMy4cjmvk9ZcHJNCXAdiqYd9DXMpTA4IgR 7sZPKkxDq1KXm+4nAHkDanvWCFUJp9dczwmhvEv3LBaJTNwaXyTLAreHodUOMltsf+ iYrZK8OgzA+d74p/SRx/nc8YUk2EuT6G2bkC4R7Q= Date: Thu, 26 Feb 2026 10:20:37 -0800 From: Andrew Morton To: Christoph Hellwig Cc: Richard Henderson , Matt Turner , Magnus Lindholm , Russell King , Catalin Marinas , Will Deacon , Huacai Chen , WANG Xuerui , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , "Christophe Leroy (CS GROUP)" , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , "David S. Miller" , Andreas Larsson , Richard Weinberger , Anton Ivanov , Johannes Berg , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Herbert Xu , Dan Williams , Chris Mason , David Sterba , Arnd Bergmann , Song Liu , Yu Kuai , Li Nan , linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, loongarch@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-crypto@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-arch@vger.kernel.org, linux-raid@vger.kernel.org Subject: Re: cleanup the RAID5 XOR library Message-Id: <20260226102037.b855483efa0bf23c72d130d3@linux-foundation.org> In-Reply-To: <20260226151106.144735-1-hch@lst.de> References: <20260226151106.144735-1-hch@lst.de> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260226_102040_814408_71250F8C X-CRM114-Status: GOOD ( 17.03 ) X-BeenThere: linux-um@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-um" Errors-To: linux-um-bounces+linux-um=archiver.kernel.org@lists.infradead.org On Thu, 26 Feb 2026 07:10:12 -0800 Christoph Hellwig wrote: > the XOR library used for the RAID5 parity is a bit of a mess right now. > The main file sits in crypto/ despite not being cryptography and not > using the crypto API, with the generic implementations sitting in > include/asm-generic and the arch implementations sitting in an asm/ > header in theory. The latter doesn't work for many cases, so > architectures often build the code directly into the core kernel, or > create another module for the architecture code. > > Changes this to a single module in lib/ that also contains the > architecture optimizations, similar to the library work Eric Biggers > has done for the CRC and crypto libraries later. After that it changes > to better calling conventions that allow for smarter architecture > implementations (although none is contained here yet), and uses > static_call to avoid indirection function call overhead. Thanks, I'll add this to mm.git's mm-nonmm-unstable tree for some testing in linux-next.