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Message-ID: <20240511224035.27775-3-kris.van.hees@oracle.com>
Date: Sat, 11 May 2024 18:40:31 -0400
From: Kris Van Hees <kris.van.hees@...cle.com>
To: linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
linux-modules@...r.kernel.org, linux-trace-kernel@...r.kernel.org
Cc: Kris Van Hees <kris.van.hees@...cle.com>,
Nick Alcock <nick.alcock@...cle.com>,
Alan Maguire <alan.maguire@...cle.com>,
Steven Rostedt <rostedt@...dmis.org>,
Luis Chamberlain <mcgrof@...nel.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Jiri Olsa <olsajiri@...il.com>,
Elena Zannoni <elena.zannoni@...cle.com>
Subject: [PATCH v2 2/6] trace: add CONFIG_BUILTIN_MODULE_RANGES option
The CONFIG_BUILTIN_MODULE_RANGES option controls whether offset range data
is generated for kernel modules that are built into the kernel image.
Signed-off-by: Kris Van Hees <kris.van.hees@...cle.com>
Reviewed-by: Nick Alcock <nick.alcock@...cle.com>
Reviewed-by: Alan Maguire <alan.maguire@...cle.com>
---
Changes since v1:
- Renamed CONFIG_BUILTIN_RANGES to CONFIG_BUILTIN_MODULE_RANGES
- Moved the config option to the tracers section
---
kernel/trace/Kconfig | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 47345bf1d4a9f..839a56e971cc0 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -188,6 +188,23 @@ menuconfig FTRACE
if FTRACE
+config BUILTIN_MODULE_RANGES
+ bool "Generate address range information for builtin modules"
+ select 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.
+
config BOOTTIME_TRACING
bool "Boot-time Tracing support"
depends on TRACING
--
2.43.0
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