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Sat, 24 Aug 2024 03:38:13 +0000 Received: from SN7PR10MB6287.namprd10.prod.outlook.com ([fe80::5a47:2d75:eef9:1d29]) by SN7PR10MB6287.namprd10.prod.outlook.com ([fe80::5a47:2d75:eef9:1d29%5]) with mapi id 15.20.7918.011; Sat, 24 Aug 2024 03:38:13 +0000 From: Kris Van Hees To: linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org, linux-modules@vger.kernel.org, linux-trace-kernel@vger.kernel.org Cc: Kris Van Hees , Steven Rostedt , Masahiro Yamada , Luis Chamberlain , Masami Hiramatsu , Nick Desaulniers , Jiri Olsa , Elena Zannoni Subject: [PATCH v9 1/4] kbuild: add mod(name,file)_flags to assembler flags for module objects Date: Fri, 23 Aug 2024 23:37:54 -0400 Message-ID: <20240824033757.52005-2-kris.van.hees@oracle.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240824033757.52005-1-kris.van.hees@oracle.com> References: <20240824033757.52005-1-kris.van.hees@oracle.com> X-ClientProxiedBy: BYAPR04CA0024.namprd04.prod.outlook.com (2603:10b6:a03:40::37) To SN7PR10MB6287.namprd10.prod.outlook.com (2603:10b6:806:26d::14) Precedence: bulk X-Mailing-List: linux-kbuild@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN7PR10MB6287:EE_|BLAPR10MB5171:EE_ X-MS-Office365-Filtering-Correlation-Id: c194b853-dd4c-4817-3b02-08dcc3ee2edb X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|7416014|376014|1800799024; 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To identify what code is compiled into modules during a kernel build, one can look for the presence of the -DKBUILD_MODFILE and -DKBUILD_MODNAME options in the compile command lines. A simple grep in .*.cmd files for those options is sufficient for this. Unfortunately, these options are only passed when compiling C source files. Various modules also include objects built from assembler source, and these options are not passed in that case. Adding $(modfile_flags) to modkern_aflags (similar to modkern_cflags), and adding $(modname_flags) to a_flags (similar to c_flags) makes it possible to identify which objects are compiled into modules for both C and assembler source files. While KBUILD_MODFILE is sufficient to generate the modules ranges data, KBUILD_MODNAME is passed as well for consistency with the C source code case. Signed-off-by: Kris Van Hees Reviewed-by: Steven Rostedt (Google) --- Changes since v8: - Fixed typos. - Explained KBUILD_MODNAME being added for consistency. --- scripts/Makefile.lib | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib index fe3668dc4954..170f462537a8 100644 --- a/scripts/Makefile.lib +++ b/scripts/Makefile.lib @@ -238,7 +238,7 @@ modkern_rustflags = \ modkern_aflags = $(if $(part-of-module), \ $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE), \ - $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)) + $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL) $(modfile_flags)) c_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ -include $(srctree)/include/linux/compiler_types.h \ @@ -248,7 +248,7 @@ c_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ rust_flags = $(_rust_flags) $(modkern_rustflags) @$(objtree)/include/generated/rustc_cfg a_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ - $(_a_flags) $(modkern_aflags) + $(_a_flags) $(modkern_aflags) $(modname_flags) cpp_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ $(_cpp_flags)