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GET /api/patches/2196612/?format=api
{ "id": 2196612, "url": "http://patchwork.ozlabs.org/api/patches/2196612/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-um/patch/20260215142803.1455757-2-maci.stgn@gmail.com/", "project": { "id": 60, "url": "http://patchwork.ozlabs.org/api/projects/60/?format=api", "name": "User-mode Linux Development", "link_name": "linux-um", "list_id": "linux-um.lists.infradead.org", "list_email": "linux-um@lists.infradead.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260215142803.1455757-2-maci.stgn@gmail.com>", "list_archive_url": null, "date": "2026-02-15T14:28:03", "name": "[2/2] um: avoid struct sigcontext redefinition with musl", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "b4a74026b16dcc379c7fdf52622c9c7ebbda79f4", "submitter": { "id": 92646, "url": "http://patchwork.ozlabs.org/api/people/92646/?format=api", "name": "Marcel W. Wysocki", "email": "maci.stgn@gmail.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-um/patch/20260215142803.1455757-2-maci.stgn@gmail.com/mbox/", "series": [ { "id": 492220, "url": "http://patchwork.ozlabs.org/api/series/492220/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-um/list/?series=492220", "date": "2026-02-15T14:28:03", "name": "[1/2] um: fix address-of CMSG_DATA() rvalue in stub", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/492220/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2196612/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2196612/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-um-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n secure) header.d=lists.infradead.org header.i=@lists.infradead.org\n header.a=rsa-sha256 header.s=bombadil.20210309 header.b=k+6c6X2+;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20230601 header.b=k5Ql++5r;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=none (no SPF record) smtp.mailfrom=lists.infradead.org\n (client-ip=2607:7c80:54:3::133; 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Wysocki\" <maci.stgn@gmail.com>", "To": "Richard Weinberger <richard@nod.at>,\n\tAnton Ivanov <anton.ivanov@cambridgegreys.com>,\n\tJohannes Berg <johannes@sipsolutions.net>", "Cc": "linux-um@lists.infradead.org,\n\tlinux-kernel@vger.kernel.org,\n\t\"Marcel W . Wysocki\" <maci.stgn@gmail.com>", "Subject": "[PATCH 2/2] um: avoid struct sigcontext redefinition with musl", "Date": "Sun, 15 Feb 2026 22:28:03 +0800", "Message-ID": "<20260215142803.1455757-2-maci.stgn@gmail.com>", "X-Mailer": "git-send-email 2.53.0", "In-Reply-To": "<20260215142803.1455757-1-maci.stgn@gmail.com>", "References": "<20260215142803.1455757-1-maci.stgn@gmail.com>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-CRM114-Version": "20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 ", "X-CRM114-CacheID": "sfid-20260215_062821_016576_67AB5096 ", "X-CRM114-Status": "GOOD ( 10.44 )", "X-Spam-Score": "-2.1 (--)", "X-Spam-Report": "Spam detection software,\n running on the system \"bombadil.infradead.org\",\n has NOT identified this incoming email as spam. The original\n message has been attached to this so you can view it or label\n similar future email. If you have any questions, see\n the administrator of that system for details.\n Content preview: mcontext.c includes both <sys/ucontext.h> and\n <asm/sigcontext.h>.\n With musl libc,\n this causes a struct sigcontext redefinition error: <sys/ucontext.h>\n pulls in musl's <bits/signal.h>, which defines struct sigcontext directly.\n The kernel's <asm/sigcontext.h> then provides a second,\n conflicting definition\n of the same struct.\n Content analysis details: (-2.1 points, 5.0 required)\n pts rule name description\n ---- ----------------------\n --------------------------------------------------\n -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no\n trust\n [2607:f8b0:4864:20:0:0:0:629 listed in]\n [list.dnswl.org]\n 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record\n -0.0 SPF_PASS SPF: sender matches SPF record\n -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from\n author's\n domain\n -0.1 DKIM_VALID Message has at least one valid DKIM or DK\n signature\n 0.1 DKIM_SIGNED Message has a DKIM or DK signature,\n not necessarily valid\n -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from\n envelope-from domain\n -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1%\n [score: 0.0000]\n 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail\n provider\n [maci.stgn(at)gmail.com]", "X-BeenThere": "linux-um@lists.infradead.org", "X-Mailman-Version": "2.1.34", "Precedence": "list", "List-Id": "<linux-um.lists.infradead.org>", "List-Unsubscribe": "<http://lists.infradead.org/mailman/options/linux-um>,\n <mailto:linux-um-request@lists.infradead.org?subject=unsubscribe>", "List-Archive": "<http://lists.infradead.org/pipermail/linux-um/>", "List-Post": "<mailto:linux-um@lists.infradead.org>", "List-Help": "<mailto:linux-um-request@lists.infradead.org?subject=help>", "List-Subscribe": "<http://lists.infradead.org/mailman/listinfo/linux-um>,\n <mailto:linux-um-request@lists.infradead.org?subject=subscribe>", "Sender": "\"linux-um\" <linux-um-bounces@lists.infradead.org>", "Errors-To": "linux-um-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org" }, "content": "mcontext.c includes both <sys/ucontext.h> and <asm/sigcontext.h>.\nWith musl libc, this causes a struct sigcontext redefinition error:\n\n <sys/ucontext.h> pulls in musl's <bits/signal.h>, which defines\n struct sigcontext directly. The kernel's <asm/sigcontext.h> then\n provides a second, conflicting definition of the same struct.\n\nWith glibc this does not conflict because glibc's signal headers\nsource their struct sigcontext from the kernel's own UAPI headers,\nso the include guard in <asm/sigcontext.h> makes the second\ninclusion a no-op.\n\nmcontext.c does not actually use struct sigcontext by name -- it\nonly needs the FP-state types (_fpstate, _xstate, etc.) that are\ndefined in <asm/sigcontext.h> independently of the sigcontext\nstruct.\n\nTemporarily rename sigcontext to __kernel_sigcontext during the\ninclusion of <asm/sigcontext.h> so that the kernel's definition\ndoes not collide with musl's. The #undef restores normal name\nresolution immediately afterward.\n\nNo functional change with glibc; fixes the build with musl.\n\nSigned-off-by: Marcel W. Wysocki <maci.stgn@gmail.com>\n---\n arch/x86/um/os-Linux/mcontext.c | 7 ++++++-\n 1 file changed, 6 insertions(+), 1 deletion(-)", "diff": "diff --git a/arch/x86/um/os-Linux/mcontext.c b/arch/x86/um/os-Linux/mcontext.c\n--- a/arch/x86/um/os-Linux/mcontext.c\n+++ b/arch/x86/um/os-Linux/mcontext.c\n@@ -4,7 +4,13 @@\n #include <linux/string.h>\n #include <sys/ucontext.h>\n #include <asm/ptrace.h>\n+/*\n+ * musl defines struct sigcontext in <bits/signal.h>. Rename the kernel's\n+ * copy to avoid redefinition while keeping the FP-state types available.\n+ */\n+#define sigcontext __kernel_sigcontext\n #include <asm/sigcontext.h>\n+#undef sigcontext\n #include <sysdep/ptrace.h>\n #include <sysdep/mcontext.h>\n #include <arch.h>\n", "prefixes": [ "2/2" ] }