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

[Allen Webb]

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@xxxxxxxxxx>
---
 include/linux/module.h | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

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>].
-- 
2.37.3