linux-kernel - [PATCH 2/3] ARM: Select ARCH_USES_CFI_GENERIC_LLVM

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Message-Id: <20251025-idpf-fix-arm-kcfi-build-error-v1-2-ec57221153ae@kernel.org>
Date: Sat, 25 Oct 2025 21:53:19 +0100
From: Nathan Chancellor <nathan@...nel.org>
To: Kees Cook <kees@...nel.org>, 
 Alexander Lobakin <aleksander.lobakin@...el.com>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: Simon Horman <horms@...nel.org>, Nathan Chancellor <nathan@...nel.org>, 
 Nick Desaulniers <nick.desaulniers+lkml@...il.com>, 
 Bill Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>, 
 Sami Tolvanen <samitolvanen@...gle.com>, 
 Russell King <linux@...linux.org.uk>, 
 Tony Nguyen <anthony.l.nguyen@...el.com>, 
 Michal Kubiak <michal.kubiak@...el.com>, linux-kernel@...r.kernel.org, 
 llvm@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, 
 netdev@...r.kernel.org, intel-wired-lan@...ts.osuosl.org
Subject: [PATCH 2/3] ARM: Select ARCH_USES_CFI_GENERIC_LLVM_PASS

Prior to clang 22.0.0 [1], ARM did not have an architecture specific
kCFI bundle lowering in the backend, which may cause issues. Select
CONFIG_ARCH_USES_CFI_GENERIC_LLVM_PASS to enable use of __nocfi_generic.

Link: https://github.com/llvm/llvm-project/commit/d130f402642fba3d065aacb506cb061c899558de [1]
Link: https://github.com/ClangBuiltLinux/linux/issues/2124
Signed-off-by: Nathan Chancellor <nathan@...nel.org>
---
 arch/arm/Kconfig | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 2e3f93b690f4..4fb985b76e97 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -44,6 +44,8 @@ config ARM
 	select ARCH_USE_BUILTIN_BSWAP
 	select ARCH_USE_CMPXCHG_LOCKREF
 	select ARCH_USE_MEMTEST
+	# https://github.com/llvm/llvm-project/commit/d130f402642fba3d065aacb506cb061c899558de
+	select ARCH_USES_CFI_GENERIC_LLVM_PASS if CLANG_VERSION < 220000
 	select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU
 	select ARCH_WANT_GENERAL_HUGETLB
 	select ARCH_WANT_IPC_PARSE_VERSION

-- 
2.51.1