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GET /api/patches/2216736/?format=api
{ "id": 2216736, "url": "http://patchwork.ozlabs.org/api/patches/2216736/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260327061704.3707577-23-hch@lst.de/", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/projects/2/?format=api", "name": "Linux PPC development", "link_name": "linuxppc-dev", "list_id": "linuxppc-dev.lists.ozlabs.org", "list_email": "linuxppc-dev@lists.ozlabs.org", "web_url": "https://github.com/linuxppc/wiki/wiki", "scm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git", "webscm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/", "list_archive_url_format": "https://lore.kernel.org/linuxppc-dev/{}/", "commit_url_format": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id={}" }, "msgid": "<20260327061704.3707577-23-hch@lst.de>", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/20260327061704.3707577-23-hch@lst.de/", "date": "2026-03-27T06:16:54", "name": "[22/28] xor: add a better public API", "commit_ref": null, "pull_url": null, "state": "handled-elsewhere", "archived": false, "hash": "7fce0cd5a3a2d86aeffc05f8039761834f4b4c18", "submitter": { "id": 82, "url": "http://patchwork.ozlabs.org/api/people/82/?format=api", "name": "Christoph Hellwig", "email": "hch@lst.de" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260327061704.3707577-23-hch@lst.de/mbox/", "series": [ { "id": 497693, "url": "http://patchwork.ozlabs.org/api/series/497693/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=497693", "date": "2026-03-27T06:16:33", "name": "[01/28] xor: assert that xor_blocks is not call from interrupt context", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/497693/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2216736/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2216736/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linuxppc-dev+bounces-18892-incoming=patchwork.ozlabs.org@lists.ozlabs.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linuxppc-dev@lists.ozlabs.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n secure) header.d=infradead.org header.i=@infradead.org header.a=rsa-sha256\n header.s=bombadil.20210309 header.b=toImowzz;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; 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a=rsa-sha256; q=dns/txt; c=relaxed/relaxed;\n\td=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding:\n\tMIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Sender\n\t:Reply-To:Content-Type:Content-ID:Content-Description;\n\tbh=cXd+P/yafdPCZRxsWFTFtmngTaIOvIFzm+fNmrl5LSg=; b=toImowzzR5sLK/N2cm1GTQnCuz\n\tcqd3IBoMjy8bknASMsi0zs6jR1J56F50BT+smBt/KaBYtUqovBddx5CccNXPmXVaW1iYcbLWHNCY4\n\tZ8cTUhg27wuxSs/uhXM9MbfT8A85RxDSlvYKfga+ymlWGXWqOEbLHv5Froc4HoQqLSl/nH+wld/Xs\n\tOM0mwyquJPzE2ekySLFLcfV6jS8COclLUS/oYG2aiBlDXsF7Q8/AoTym4vGK273g+W2isnTqbxWGB\n\tqjXy5TrW20XtDeOW/9Q7EqhZ5wftMbQDkav1MRCZV/JQmC+ECMyqVjcika6O0kGXDvDo/9KwaH0Bp\n\tuyaNRlSg==;", "From": "Christoph Hellwig <hch@lst.de>", "To": "Andrew Morton <akpm@linux-foundation.org>", "Cc": "Richard Henderson <richard.henderson@linaro.org>,\n\tMatt Turner <mattst88@gmail.com>,\n\tMagnus Lindholm <linmag7@gmail.com>,\n\tRussell King <linux@armlinux.org.uk>,\n\tCatalin Marinas <catalin.marinas@arm.com>,\n\tWill Deacon <will@kernel.org>,\n\tArd Biesheuvel <ardb@kernel.org>,\n\tHuacai Chen <chenhuacai@kernel.org>,\n\tWANG Xuerui <kernel@xen0n.name>,\n\tMadhavan Srinivasan <maddy@linux.ibm.com>,\n\tMichael Ellerman <mpe@ellerman.id.au>,\n\tNicholas Piggin <npiggin@gmail.com>,\n\t\"Christophe Leroy (CS GROUP)\" <chleroy@kernel.org>,\n\tPaul Walmsley <pjw@kernel.org>,\n\tPalmer Dabbelt <palmer@dabbelt.com>,\n\tAlbert Ou <aou@eecs.berkeley.edu>,\n\tAlexandre Ghiti <alex@ghiti.fr>,\n\tHeiko Carstens <hca@linux.ibm.com>,\n\tVasily Gorbik <gor@linux.ibm.com>,\n\tAlexander Gordeev <agordeev@linux.ibm.com>,\n\tChristian Borntraeger <borntraeger@linux.ibm.com>,\n\tSven Schnelle <svens@linux.ibm.com>,\n\t\"David S. Miller\" <davem@davemloft.net>,\n\tAndreas Larsson <andreas@gaisler.com>,\n\tRichard Weinberger <richard@nod.at>,\n\tAnton Ivanov <anton.ivanov@cambridgegreys.com>,\n\tJohannes Berg <johannes@sipsolutions.net>,\n\tThomas Gleixner <tglx@kernel.org>,\n\tIngo Molnar <mingo@redhat.com>,\n\tBorislav Petkov <bp@alien8.de>,\n\tDave Hansen <dave.hansen@linux.intel.com>,\n\tx86@kernel.org,\n\t\"H. Peter Anvin\" <hpa@zytor.com>,\n\tHerbert Xu <herbert@gondor.apana.org.au>,\n\tDan Williams <dan.j.williams@intel.com>,\n\tChris Mason <clm@fb.com>,\n\tDavid Sterba <dsterba@suse.com>,\n\tArnd Bergmann <arnd@arndb.de>,\n\tSong Liu <song@kernel.org>,\n\tYu Kuai <yukuai@fnnas.com>,\n\tLi Nan <linan122@huawei.com>,\n\t\"Theodore Ts'o\" <tytso@mit.edu>,\n\t\"Jason A. Donenfeld\" <Jason@zx2c4.com>,\n\tlinux-alpha@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org,\n\tlinux-arm-kernel@lists.infradead.org,\n\tloongarch@lists.linux.dev,\n\tlinuxppc-dev@lists.ozlabs.org,\n\tlinux-riscv@lists.infradead.org,\n\tlinux-s390@vger.kernel.org,\n\tsparclinux@vger.kernel.org,\n\tlinux-um@lists.infradead.org,\n\tlinux-crypto@vger.kernel.org,\n\tlinux-btrfs@vger.kernel.org,\n\tlinux-arch@vger.kernel.org,\n\tlinux-raid@vger.kernel.org", "Subject": "[PATCH 22/28] xor: add a better public API", "Date": "Fri, 27 Mar 2026 07:16:54 +0100", "Message-ID": "<20260327061704.3707577-23-hch@lst.de>", "X-Mailer": "git-send-email 2.47.3", "In-Reply-To": "<20260327061704.3707577-1-hch@lst.de>", "References": "<20260327061704.3707577-1-hch@lst.de>", "X-Mailing-List": "linuxppc-dev@lists.ozlabs.org", "List-Id": "<linuxppc-dev.lists.ozlabs.org>", "List-Help": "<mailto:linuxppc-dev+help@lists.ozlabs.org>", "List-Owner": "<mailto:linuxppc-dev+owner@lists.ozlabs.org>", "List-Post": "<mailto:linuxppc-dev@lists.ozlabs.org>", "List-Archive": "<https://lore.kernel.org/linuxppc-dev/>,\n <https://lists.ozlabs.org/pipermail/linuxppc-dev/>", "List-Subscribe": "<mailto:linuxppc-dev+subscribe@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-digest@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-nomail@lists.ozlabs.org>", "List-Unsubscribe": "<mailto:linuxppc-dev+unsubscribe@lists.ozlabs.org>", "Precedence": "list", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-SRS-Rewrite": "SMTP reverse-path rewritten from <hch@infradead.org> by\n bombadil.infradead.org. See http://www.infradead.org/rpr.html", "X-Spam-Status": "No, score=0.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID,\n\tHEADER_FROM_DIFFERENT_DOMAINS,SPF_HELO_NONE,SPF_NONE\n\tautolearn=disabled version=4.0.1 OzLabs 8", "X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org" }, "content": "xor_blocks is very annoying to use, because it is limited to 4 + 1\nsources / destinations, has an odd argument order and is completely\nundocumented.\n\nLift the code that loops around it from btrfs and async_tx/async_xor into\ncommon code under the name xor_gen and properly document it.\n\nSigned-off-by: Christoph Hellwig <hch@lst.de>\n---\n include/linux/raid/xor.h | 2 ++\n lib/raid/xor/xor-core.c | 32 ++++++++++++++++++++++++++++++++\n 2 files changed, 34 insertions(+)", "diff": "diff --git a/include/linux/raid/xor.h b/include/linux/raid/xor.h\nindex 02bda8d99534..6d9a39fd85dd 100644\n--- a/include/linux/raid/xor.h\n+++ b/include/linux/raid/xor.h\n@@ -7,4 +7,6 @@\n extern void xor_blocks(unsigned int count, unsigned int bytes,\n \tvoid *dest, void **srcs);\n \n+void xor_gen(void *dest, void **srcs, unsigned int src_cnt, unsigned int bytes);\n+\n #endif /* _XOR_H */\ndiff --git a/lib/raid/xor/xor-core.c b/lib/raid/xor/xor-core.c\nindex de1d2899490a..07e06db32731 100644\n--- a/lib/raid/xor/xor-core.c\n+++ b/lib/raid/xor/xor-core.c\n@@ -46,6 +46,38 @@ xor_blocks(unsigned int src_count, unsigned int bytes, void *dest, void **srcs)\n }\n EXPORT_SYMBOL(xor_blocks);\n \n+/**\n+ * xor_gen - generate RAID-style XOR information\n+ * @dest:\tdestination vector\n+ * @srcs:\tsource vectors\n+ * @src_cnt:\tnumber of source vectors\n+ * @bytes:\tlength in bytes of each vector\n+ *\n+ * Performs bit-wise XOR operation into @dest for each of the @src_cnt vectors\n+ * in @srcs for a length of @bytes bytes. @src_cnt must be non-zero, and the\n+ * memory pointed to by @dest and each member of @srcs must be at least 64-byte\n+ * aligned. @bytes must be non-zero and a multiple of 512.\n+ *\n+ * Note: for typical RAID uses, @dest either needs to be zeroed, or filled with\n+ * the first disk, which then needs to be removed from @srcs.\n+ */\n+void xor_gen(void *dest, void **srcs, unsigned int src_cnt, unsigned int bytes)\n+{\n+\tunsigned int src_off = 0;\n+\n+\tWARN_ON_ONCE(bytes & 511);\n+\n+\twhile (src_cnt > 0) {\n+\t\tunsigned int this_cnt = min(src_cnt, MAX_XOR_BLOCKS);\n+\n+\t\txor_blocks(this_cnt, bytes, dest, srcs + src_off);\n+\n+\t\tsrc_cnt -= this_cnt;\n+\t\tsrc_off += this_cnt;\n+\t}\n+}\n+EXPORT_SYMBOL(xor_gen);\n+\n /* Set of all registered templates. */\n static struct xor_block_template *__initdata template_list;\n static bool __initdata xor_forced = false;\n", "prefixes": [ "22/28" ] }