linux-kernel - [PATCH 38/46] Kbuild, lto: don't include weak source file symbols in System.map

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Date:   Mon, 14 Nov 2022 12:43:36 +0100
From:   "Jiri Slaby (SUSE)" <jirislaby@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Andi Kleen <andi@...stfloor.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-kbuild@...r.kernel.org, Martin Liska <mliska@...e.cz>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 38/46] Kbuild, lto: don't include weak source file symbols in System.map

From: Andi Kleen <andi@...stfloor.org>

The gcc LTO build can generate some extra weak source code file name
symbols on the second kallsyms link like:
  0000000002fdf20a W head64.c.552cf5a6

This causes the "Inconsistent kallsyms data" error due to mismatches in
the stage1 vs stage2 kallsyms link. Filter those out when generating
the System.map.

Cc: Masahiro Yamada <masahiroy@...nel.org>
Cc: Michal Marek <michal.lkml@...kovi.net>
Cc: Nick Desaulniers <ndesaulniers@...gle.com>
Cc: linux-kbuild@...r.kernel.org
Signed-off-by: Andi Kleen <andi@...stfloor.org>
Signed-off-by: Martin Liska <mliska@...e.cz>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 scripts/mksysmap | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/scripts/mksysmap b/scripts/mksysmap
index 16a08b8ef2f8..0f19a44ab136 100755
--- a/scripts/mksysmap
+++ b/scripts/mksysmap
@@ -34,6 +34,7 @@
 #   U - undefined global symbols
 #   N - debugging symbols
 #   w - local weak symbols
+#   W - weak symbols if they contain .c.
 
 # readprofile starts reading symbols when _stext is found, and
 # continue until it finds a symbol which is not either of 'T', 't',
@@ -57,4 +58,5 @@ $NM -n $1 | grep -v		\
 	-e ' __kstrtab_'	\
 	-e ' __kstrtabns_'	\
 	-e ' L0$'		\
+	-e ' W .*\.c\.'		\
 > $2
-- 
2.38.1