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Fri, 8 Dec 2023 05:10:52 +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 , Nick Alcock , Alan Maguire , Steven Rostedt , Luis Chamberlain , Masami Hiramatsu , Nick Desaulniers , Jiri Olsa Subject: [PATCH 2/6] module: add CONFIG_BUILTIN_RANGES option Date: Fri, 8 Dec 2023 00:07:48 -0500 Message-ID: <20231208050752.2787575-3-kris.van.hees@oracle.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231208050752.2787575-1-kris.van.hees@oracle.com> References: <20231208050752.2787575-1-kris.van.hees@oracle.com> X-ClientProxiedBy: MN2PR02CA0017.namprd02.prod.outlook.com (2603:10b6:208:fc::30) To SN6PR10MB2975.namprd10.prod.outlook.com (2603:10b6:805:d2::10) Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN6PR10MB2975:EE_|BLAPR10MB5316:EE_ X-MS-Office365-Filtering-Correlation-Id: eaaf2d45-33fe-4caf-809c-08dbf7ac0cc6 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Signed-off-by: Kris Van Hees Reviewed-by: Nick Alcock Reviewed-by: Alan Maguire --- kernel/module/Kconfig | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/kernel/module/Kconfig b/kernel/module/Kconfig index 33a2e991f608..0798439b11ac 100644 --- a/kernel/module/Kconfig +++ b/kernel/module/Kconfig @@ -389,4 +389,21 @@ config MODULES_TREE_LOOKUP def_bool y depends on PERF_EVENTS || TRACING || CFI_CLANG +config BUILTIN_RANGES + bool "Generate address range information for builtin modules" + depends on VMLINUX_MAP + help + When modules are built into the kernel, there will be no module name + associated with its symbols in /proc/kallsyms. Tracers may want to + identify symbols by module name and symbol name regardless of whether + the module is configured as loadable or not. + + This option generates modules.builtin.ranges in the build tree with + offset ranges (per ELF section) for the module(s) they belong to. + It also records an anchor symbol to determine the load address of the + section. + + It is fully compatible with CONFIG_RANDOMIZE_BASE and similar late- + address-modification options. + endif # MODULES