linux-kernel - [PATCH] kbuild: exclude .rodata.(cst|str)* when building ranges

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Message-ID: <20250305192808.2826336-1-kris.van.hees@oracle.com>
Date: Wed,  5 Mar 2025 14:27:58 -0500
From: Kris Van Hees <kris.van.hees@...cle.com>
To: Masahiro Yamada <masahiroy@...nel.org>
Cc: Kris Van Hees <kris.van.hees@...cle.com>, linux-kernel@...r.kernel.org,
        linux-kbuild@...r.kernel.org, linux-modules@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org,
        Nick Alcock <nick.alcock@...cle.com>,
        Alan Maguire <alan.maguire@...cle.com>,
        Steven Rostedt <rostedt@...dmis.org>, Sam James <sam@...too.org>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Jiri Olsa <olsajiri@...il.com>,
        Elena Zannoni <elena.zannoni@...cle.com>,
        Daniel Gomez <da.gomez@...sung.com>,
        Jack Vogel <jack.vogel@...cle.com>
Subject: [PATCH] kbuild: exclude .rodata.(cst|str)* when building ranges

The .rodata.(cst|str)* sections are often resized during the final
linking and since these sections do not cover actual symbols there is
no need to include them in the modules.builtin.ranges data.

When these sections were included in processing and resizing occurred,
modules were reported with ranges that extended beyond their true end,
causing subsequent symbols (in address order) to be associated with
the wrong module.

Signed-off-by: Kris Van Hees <kris.van.hees@...cle.com>
Reviewed-by: Jack Vogel <jack.vogel@...cle.com>
---
 scripts/generate_builtin_ranges.awk | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/scripts/generate_builtin_ranges.awk b/scripts/generate_builtin_ranges.awk
index b9ec761b3bef..d4bd5c2b998c 100755
--- a/scripts/generate_builtin_ranges.awk
+++ b/scripts/generate_builtin_ranges.awk
@@ -282,6 +282,11 @@ ARGIND == 2 && !anchor && NF == 2 && $1 ~ /^0x/ && $2 !~ /^0x/ {
 # section.
 #
 ARGIND == 2 && sect && NF == 4 && /^ [^ \*]/ && !($1 in sect_addend) {
+	# There are a few sections with constant data (without symbols) that
+	# can get resized during linking, so it is best to ignore them.
+	if ($1 ~ /^\.rodata\.(cst|str)[0-9]/)
+		next;
+
 	if (!($1 in sect_base)) {
 		sect_base[$1] = base;
 
-- 
2.45.2