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 9ED3F35F5E9 for ; Fri, 27 Mar 2026 17:32:18 +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=1774632738; cv=none; b=dl8maUYoTmkdnI6ln0yPe1j3w6LwE35hVx8/yso0rFVqjLjMRBOy3/+xJHhulO6QSL7ShZ98tFVgsRkM6ZNbnMW/POWWxB/oUhoYGlXuZfpdjJeJ765kwI8p2Y37S41R7qmmD5UPcwHXP08po+QYFs079641zuNWcBgdtLJMPDI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774632738; c=relaxed/simple; bh=VNrFQKAU9SWi/ZdklsxfwBeg/q/PFFrPmYerVQ7Ya3U=; h=Date:To:From:Subject:Message-Id; b=OupNPaBO7euEtO6zM5lsHbScRB30qusOk++enTbszIdnAkI+f83CnHUetIa2LOAoRsy7P37H4djEnKCZacGFVI/5Rra6vggwY7dkEfsZ0E9siKQkARxYHs8erlMOpvv9MkRR98HyBGeRbtsYtICtUL0xNc8tZkzxVxR+yq37zbI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=yYLI7Bzf; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="yYLI7Bzf" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 37724C19423; Fri, 27 Mar 2026 17:32:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1774632738; bh=VNrFQKAU9SWi/ZdklsxfwBeg/q/PFFrPmYerVQ7Ya3U=; h=Date:To:From:Subject:From; b=yYLI7BzfxZEesB5dej+XYxWe96S4kSQi7CIBEviluXBItzmZ8RUT+Z+DhVVs3OOGI 00uX9LeoFW96xES3xpb1Ep6t7kkXT3VPf9QODUWDigUieXbJ3Q0F8xfbBDUnfnHZIQ 9cXHcseg0yrlw9HZm6lW9utsh3lWW+3FvbEwlDS8= Date: Fri, 27 Mar 2026 10:32:17 -0700 To: mm-commits@vger.kernel.org,hch@lst.de,akpm@linux-foundation.org From: Andrew Morton Subject: [to-be-updated] xor-add-a-better-public-api.patch removed from -mm tree Message-Id: <20260327173218.37724C19423@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The quilt patch titled Subject: xor: add a better public API has been removed from the -mm tree. Its filename was xor-add-a-better-public-api.patch This patch was dropped because an updated version will be issued ------------------------------------------------------ From: Christoph Hellwig Subject: xor: add a better public API Date: Tue, 24 Mar 2026 07:21:57 +0100 xor_blocks is very annoying to use, because it is limited to 4 + 1 sources / destinations, has an odd argument order and is completely undocumented. Lift the code that loops around it from btrfs and async_tx/async_xor into common code under the name xor_gen and properly document it. Link: https://lkml.kernel.org/r/20260324062211.3216301-22-hch@lst.de Signed-off-by: Christoph Hellwig Cc: Albert Ou Cc: Alexander Gordeev Cc: Alexandre Ghiti Cc: Andreas Larsson Cc: Anton Ivanov Cc: Ard Biesheuvel Cc: Arnd Bergmann Cc: "Borislav Petkov (AMD)" Cc: Catalin Marinas Cc: Chris Mason Cc: Christian Borntraeger Cc: Dan Williams Cc: David S. Miller Cc: David Sterba Cc: Heiko Carstens Cc: Herbert Xu Cc: "H. Peter Anvin" Cc: Huacai Chen Cc: Ingo Molnar Cc: Jason A. Donenfeld Cc: Johannes Berg Cc: Li Nan Cc: Madhavan Srinivasan Cc: Magnus Lindholm Cc: Matt Turner Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Palmer Dabbelt Cc: Richard Henderson Cc: Richard Weinberger Cc: Russell King Cc: Song Liu Cc: Sven Schnelle Cc: Ted Ts'o Cc: Vasily Gorbik Cc: WANG Xuerui Cc: Will Deacon Signed-off-by: Andrew Morton --- include/linux/raid/xor.h | 2 ++ lib/raid/xor/xor-core.c | 32 ++++++++++++++++++++++++++++++++ 2 files changed, 34 insertions(+) --- a/include/linux/raid/xor.h~xor-add-a-better-public-api +++ a/include/linux/raid/xor.h @@ -7,4 +7,6 @@ extern void xor_blocks(unsigned int count, unsigned int bytes, void *dest, void **srcs); +void xor_gen(void *dest, void **srcs, unsigned int src_cnt, unsigned int bytes); + #endif /* _XOR_H */ --- a/lib/raid/xor/xor-core.c~xor-add-a-better-public-api +++ a/lib/raid/xor/xor-core.c @@ -46,6 +46,38 @@ xor_blocks(unsigned int src_count, unsig } EXPORT_SYMBOL(xor_blocks); +/** + * xor_gen - generate RAID-style XOR information + * @dest: destination vector + * @srcs: source vectors + * @src_cnt: number of source vectors + * @bytes: length in bytes of each vector + * + * Performs bit-wise XOR operation into @dest for each of the @src_cnt vectors + * in @srcs for a length of @bytes bytes. @src_count must be non-zero, and the + * memory pointed to by @dest and each member of @srcs must be at least 64-byte + * aligned. @bytes must be non-zero and a multiple of 512. + * + * Note: for typical RAID uses, @dest either needs to be zeroed, or filled with + * the first disk, which then needs to be removed from @srcs. + */ +void xor_gen(void *dest, void **srcs, unsigned int src_cnt, unsigned int bytes) +{ + unsigned int src_off = 0; + + WARN_ON_ONCE(bytes & 511); + + while (src_cnt > 0) { + unsigned int this_cnt = min(src_cnt, MAX_XOR_BLOCKS); + + xor_blocks(this_cnt, bytes, dest, srcs + src_off); + + src_cnt -= this_cnt; + src_off += this_cnt; + } +} +EXPORT_SYMBOL(xor_gen); + /* Set of all registered templates. */ static struct xor_block_template *__initdata template_list; static bool __initdata xor_forced = false; _ Patches currently in -mm which might be from hch@lst.de are async_xor-use-xor_gen.patch btrfs-use-xor_gen.patch xor-pass-the-entire-operation-to-the-low-level-ops.patch xor-use-static_call-for-xor_gen.patch xor-add-a-kunit-test-case.patch