linux-kernel - [PATCH] scripts/mksysmap: skip objtool __pfx

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Message-Id: <20250328112156.2614513-1-arnd@kernel.org>
Date: Fri, 28 Mar 2025 11:48:19 +0100
From: Arnd Bergmann <arnd@...nel.org>
To: Masahiro Yamada <masahiroy@...nel.org>,
	Rae Moar <rmoar@...gle.com>,
	Shuah Khan <skhan@...uxfoundation.org>,
	Sergio González Collado <sergio.collado@...il.com>,
	David Gow <davidgow@...gle.com>
Cc: Arnd Bergmann <arnd@...db.de>,
	Nathan Chancellor <nathan@...nel.org>,
	Nicolas Schier <nicolas.schier@...ux.dev>,
	Mostafa Saleh <smostafa@...gle.com>,
	linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] scripts/mksysmap: skip objtool __pfx_ symbols

From: Arnd Bergmann <arnd@...db.de>

The recently added testcase for overly long symbols triggers when
CONFIG_FUNCTION_PADDING_CFI is set:

Symbol __pfx_snnnng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nnng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nnnng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nnng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nnnnng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nnng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nnnng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nnng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nng1h2i3j4k5l6m7ng1h2i3j4k5l6m7n too long for kallsyms (517 >= 512).
Please increase KSYM_NAME_LEN both in kernel and kallsyms.c

Change the mksymtab table so the prefixed symbols are not included
in kallsyms.

Fixes: c104c16073b7 ("Kunit to check the longest symbol length")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 scripts/mksysmap | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/scripts/mksysmap b/scripts/mksysmap
index 3accbdb269ac..33df38ede1e0 100755
--- a/scripts/mksysmap
+++ b/scripts/mksysmap
@@ -59,6 +59,9 @@
 # EXPORT_SYMBOL (namespace)
 / __kstrtabns_/d

+# prefixed symbols from objtool
+/ __pfx_/d
+
 # ---------------------------------------------------------------------------
 # Ignored suffixes
 #  (do not forget '$' after each pattern)
-- 
2.39.5