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[v8,5/9] module.h: MODULE_DEVICE_TABLE for built-in modules

Message ID 20221219191855.2010466-6-allenwebb@google.com (mailing list archive)
State New, archived
Headers show
Series [v8,1/9] imx: Fix typo | expand

Commit Message

Allen Webb Dec. 19, 2022, 7:18 p.m. UTC 
Implement MODULE_DEVICE_TABLE for build-in modules to make it possible
to generate a builtin.alias file to complement modules.alias.

Signed-off-by: Allen Webb <allenwebb@google.com>
---
 include/linux/module.h | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)
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Patch

diff --git a/include/linux/module.h b/include/linux/module.h
index ec61fb53979a9..3d1b04ca63505 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -243,7 +243,20 @@  extern void cleanup_module(void);
 extern typeof(name) __mod_##type##__##name##_device_table		\
   __attribute__ ((unused, alias(__stringify(name))))
 #else  /* !MODULE */
-#define MODULE_DEVICE_TABLE(type, name)
+/*
+ * The names may not be unique for built-in modules, so include the module name
+ * to guarantee uniqueness.
+ *
+ * Note that extern is needed because modpost reads these symbols to generate
+ * modalias entries for each match id in each device table. They are not used
+ * at runtime.
+ */
+#define MODULE_DEVICE_TABLE(type, name)					\
+extern void *CONCATENATE(						\
+	CONCATENATE(__mod_##type##__##name##__,				\
+		__KBUILD_MODNAME),					\
+	_device_table)							\
+	__attribute__ ((unused, alias(__stringify(name))))
 #endif
 
 /* Version of form [<epoch>:]<version>[-<extra-version>].