linux-kernel - [PATCH 5.15 44/76] modpost: Include '.text.*' in TEXT

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Message-ID: <20240313164223.615640-45-sashal@kernel.org>
Date: Wed, 13 Mar 2024 12:41:51 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Nathan Chancellor <nathan@...nel.org>,
	Vincent Donnefort <vdonnefort@...gle.com>,
	Alexander Lobakin <alexandr.lobakin@...el.com>,
	Sami Tolvanen <samitolvanen@...gle.com>,
	Masahiro Yamada <masahiroy@...nel.org>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 44/76] modpost: Include '.text.*' in TEXT_SECTIONS

From: Nathan Chancellor <nathan@...nel.org>

[ Upstream commit 19331e84c3873256537d446afec1f6c507f8c4ef ]

Commit 6c730bfc894f ("modpost: handle -ffunction-sections") added
".text.*" to the OTHER_TEXT_SECTIONS macro to fix certain section
mismatch warnings. Unfortunately, this makes it impossible for modpost
to warn about section mismatches with LTO, which implies
'-ffunction-sections', as all functions are put in their own
'.text.<func_name>' sections, which may still reference functions in
sections they are not supposed to, such as __init.

Fix this by moving ".text.*" into TEXT_SECTIONS, so that configurations
with '-ffunction-sections' will see warnings about mismatched sections.

Link: https://lore.kernel.org/Y39kI3MOtVI5BAnV@google.com/
Reported-by: Vincent Donnefort <vdonnefort@...gle.com>
Reviewed-and-tested-by: Alexander Lobakin <alexandr.lobakin@...el.com>
Reviewed-by: Sami Tolvanen <samitolvanen@...gle.com>
Tested-by: Vincent Donnefort <vdonnefort@...gle.com>
Signed-off-by: Nathan Chancellor <nathan@...nel.org>
Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
Stable-dep-of: 397586506c3d ("modpost: Add '.ltext' and '.ltext.*' to TEXT_SECTIONS")
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 scripts/mod/modpost.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index c6e655e0ed988..43bacdee5cc5d 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -936,10 +936,10 @@ static void check_section(const char *modname, struct elf_info *elf,
 #define ALL_EXIT_SECTIONS EXIT_SECTIONS, ALL_XXXEXIT_SECTIONS
 
 #define DATA_SECTIONS ".data", ".data.rel"
-#define TEXT_SECTIONS ".text", ".text.unlikely", ".sched.text", \
+#define TEXT_SECTIONS ".text", ".text.*", ".sched.text", \
 		".kprobes.text", ".cpuidle.text", ".noinstr.text"
 #define OTHER_TEXT_SECTIONS ".ref.text", ".head.text", ".spinlock.text", \
-		".fixup", ".entry.text", ".exception.text", ".text.*", \
+		".fixup", ".entry.text", ".exception.text", \
 		".coldtext", ".softirqentry.text"
 
 #define INIT_SECTIONS      ".init.*"
-- 
2.43.0