diff mbox series

[v2,2/6] trace: add CONFIG_BUILTIN_MODULE_RANGES option

Message ID 20240511224035.27775-3-kris.van.hees@oracle.com (mailing list archive)
State New
Headers show
Series Generate address range data for built-in modules | expand

Commit Message

Kris Van Hees May 11, 2024, 10:40 p.m. UTC 
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@oracle.com>
Reviewed-by: Nick Alcock <nick.alcock@oracle.com>
Reviewed-by: Alan Maguire <alan.maguire@oracle.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(+)

Comments

kernel test robot May 14, 2024, 11:20 p.m. UTC | #1 
Hi Kris,

kernel test robot noticed the following build warnings:

[auto build test WARNING on dd5a440a31fae6e459c0d6271dddd62825505361]

url:    https://github.com/intel-lab-lkp/linux/commits/Kris-Van-Hees/kbuild-add-modules-builtin-objs/20240512-065954
base:   dd5a440a31fae6e459c0d6271dddd62825505361
patch link:    https://lore.kernel.org/r/20240511224035.27775-3-kris.van.hees%40oracle.com
patch subject: [PATCH v2 2/6] trace: add CONFIG_BUILTIN_MODULE_RANGES option
config: arc-kismet-CONFIG_VMLINUX_MAP-CONFIG_BUILTIN_MODULE_RANGES-0-0 (https://download.01.org/0day-ci/archive/20240515/202405150623.lmS5sVhM-lkp@intel.com/config)
reproduce: (https://download.01.org/0day-ci/archive/20240515/202405150623.lmS5sVhM-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202405150623.lmS5sVhM-lkp@intel.com/

kismet warnings: (new ones prefixed by >>)
>> kismet: WARNING: unmet direct dependencies detected for VMLINUX_MAP when selected by BUILTIN_MODULE_RANGES
   WARNING: unmet direct dependencies detected for VMLINUX_MAP
     Depends on [n]: EXPERT [=n]
     Selected by [y]:
     - BUILTIN_MODULE_RANGES [=y] && FTRACE [=y]
diff mbox series

Patch

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