From: Josh Poimboeuf <jpoimboe@kernel.org>
Date: Wed, 17 Sep 2025 16:03:15 +0000 (-0700)
Subject: elfnote: Change ELFNOTE() to use __UNIQUE_ID()
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=c2d420796a427dda71a2400909864e7f8e037fd4;p=thirdparty%2Fkernel%2Flinux.git

elfnote: Change ELFNOTE() to use __UNIQUE_ID()

In preparation for the objtool klp diff subcommand, replace the custom
unique symbol name generation in ELFNOTE() with __UNIQUE_ID().

This standardizes the naming format for all "unique" symbols, which will
allow objtool to properly correlate them.  Note this also removes the
"one ELF note per line" limitation.

Acked-by: Petr Mladek <pmladek@suse.com>
Tested-by: Joe Lawrence <joe.lawrence@redhat.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
---

diff --git a/include/linux/elfnote.h b/include/linux/elfnote.h
index 69b136e4dd2b6..bb3dcded055fc 100644
--- a/include/linux/elfnote.h
+++ b/include/linux/elfnote.h
@@ -60,23 +60,21 @@
 
 #else	/* !__ASSEMBLER__ */
 #include <uapi/linux/elf.h>
+#include <linux/compiler.h>
 /*
  * Use an anonymous structure which matches the shape of
  * Elf{32,64}_Nhdr, but includes the name and desc data.  The size and
  * type of name and desc depend on the macro arguments.  "name" must
- * be a literal string, and "desc" must be passed by value.  You may
- * only define one note per line, since __LINE__ is used to generate
- * unique symbols.
+ * be a literal string, and "desc" must be passed by value.
  */
-#define _ELFNOTE_PASTE(a,b)	a##b
-#define _ELFNOTE(size, name, unique, type, desc)			\
+#define ELFNOTE(size, name, type, desc)					\
 	static const struct {						\
 		struct elf##size##_note _nhdr;				\
 		unsigned char _name[sizeof(name)]			\
 		__attribute__((aligned(sizeof(Elf##size##_Word))));	\
 		typeof(desc) _desc					\
 			     __attribute__((aligned(sizeof(Elf##size##_Word)))); \
-	} _ELFNOTE_PASTE(_note_, unique)				\
+	} __UNIQUE_ID(note)						\
 		__used							\
 		__attribute__((section(".note." name),			\
 			       aligned(sizeof(Elf##size##_Word)),	\
@@ -89,11 +87,10 @@
 		name,							\
 		desc							\
 	}
-#define ELFNOTE(size, name, type, desc)		\
-	_ELFNOTE(size, name, __LINE__, type, desc)
 
 #define ELFNOTE32(name, type, desc) ELFNOTE(32, name, type, desc)
 #define ELFNOTE64(name, type, desc) ELFNOTE(64, name, type, desc)
+
 #endif	/* __ASSEMBLER__ */
 
 #endif /* _LINUX_ELFNOTE_H */