linux-kernel - [tip: objtool/core] modpost: Ignore unresolved section bounds symbols

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Message-ID: <176060838955.709179.1648660183754455287.tip-bot2@tip-bot2>
Date: Thu, 16 Oct 2025 09:53:09 -0000
From: "tip-bot2 for Josh Poimboeuf" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Masahiro Yamada <masahiroy@...nel.org>, Petr Mladek <pmladek@...e.com>,
 Joe Lawrence <joe.lawrence@...hat.com>, Josh Poimboeuf <jpoimboe@...nel.org>,
 x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: objtool/core] modpost: Ignore unresolved section bounds symbols

The following commit has been merged into the objtool/core branch of tip:

Commit-ID:     4109043bff31f95d3da9ace33eb3c1925fd62cbd
Gitweb:        https://git.kernel.org/tip/4109043bff31f95d3da9ace33eb3c1925fd62cbd
Author:        Josh Poimboeuf <jpoimboe@...nel.org>
AuthorDate:    Wed, 17 Sep 2025 09:03:17 -07:00
Committer:     Josh Poimboeuf <jpoimboe@...nel.org>
CommitterDate: Tue, 14 Oct 2025 14:45:22 -07:00

modpost: Ignore unresolved section bounds symbols

In preparation for klp-build livepatch module creation tooling,
suppress warnings for unresolved references to linker-generated
__start_* and __stop_* section bounds symbols.

These symbols are expected to be undefined when modpost runs, as they're
created later by the linker.

Cc: Masahiro Yamada <masahiroy@...nel.org>
Acked-by: Petr Mladek <pmladek@...e.com>
Tested-by: Joe Lawrence <joe.lawrence@...hat.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
---
 scripts/mod/modpost.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 47c8aa2..755b842 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -606,6 +606,11 @@ static int ignore_undef_symbol(struct elf_info *info, const char *symname)
 		    strstarts(symname, "_savevr_") ||
 		    strcmp(symname, ".TOC.") == 0)
 			return 1;
+
+	/* ignore linker-created section bounds variables */
+	if (strstarts(symname, "__start_") || strstarts(symname, "__stop_"))
+		return 1;
+
 	/* Do not ignore this symbol */
 	return 0;
 }