linux-kernel - [PATCH] [v2] kallsyms: ignore ARMv4 thunks along with others

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Message-Id: <20240215083225.3976252-1-arnd@kernel.org>
Date: Thu, 15 Feb 2024 09:32:08 +0100
From: Arnd Bergmann <arnd@...nel.org>
To: Masahiro Yamada <masahiroy@...nel.org>,
	Arnd Bergmann <arnd@...db.de>
Cc: Nathan Chancellor <nathan@...nel.org>,
	Nicolas Schier <nicolas@...sle.eu>,
	Pierre-Clément Tosi <ptosi@...gle.com>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Ard Biesheuvel <ardb@...nel.org>,
	"Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
	linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] [v2] kallsyms: ignore ARMv4 thunks along with others

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

lld is now able to build ARMv4 and ARMv4T kernels, which means it can
generate thunks for those (__ARMv4PILongThunk_*, __ARMv4PILongBXThunk_*)
that can interfere with kallsyms table generation since they do not get
ignore like the corresponding ARMv5+ ones are:

Inconsistent kallsyms data
Try "make KALLSYMS_EXTRA_PASS=1" as a workaround

Replace the hardcoded list of thunk symbols with a more general regex that
covers this one along with future symbols that follow the same pattern.

Fixes: 5eb6e280432d ("ARM: 9289/1: Allow pre-ARMv5 builds with ld.lld 16.0.0 and newer")
Fixes: efe6e3068067 ("kallsyms: fix nonconverging kallsyms table with lld")
Suggested-by: Masahiro Yamada <masahiroy@...nel.org>
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
v2: use a regular expression instead of listing each one.
---
 scripts/mksysmap | 13 ++-----------
 1 file changed, 2 insertions(+), 11 deletions(-)

diff --git a/scripts/mksysmap b/scripts/mksysmap
index 9ba1c9da0a40..57ff5656d566 100755
--- a/scripts/mksysmap
+++ b/scripts/mksysmap
@@ -48,17 +48,8 @@ ${NM} -n ${1} | sed >${2} -e "
 / __kvm_nvhe_\\$/d
 / __kvm_nvhe_\.L/d
 
-# arm64 lld
-/ __AArch64ADRPThunk_/d
-
-# arm lld
-/ __ARMV5PILongThunk_/d
-/ __ARMV7PILongThunk_/d
-/ __ThumbV7PILongThunk_/d
-
-# mips lld
-/ __LA25Thunk_/d
-/ __microLA25Thunk_/d
+# lld arm/aarch64/mips thunks
+/ __[[:alnum:]]*Thunk_/d
 
 # CFI type identifiers
 / __kcfi_typeid_/d
-- 
2.39.2