linux-kernel - [PATCH 1/6] x86/build: Remove cc-option for GCC retpoline flags

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Message-Id: <20250814-x86-min-ver-cleanups-v1-1-ff7f19457523@kernel.org>
Date: Thu, 14 Aug 2025 18:31:37 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, 
 Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, 
 x86@...nel.org
Cc: linux-kernel@...r.kernel.org, llvm@...ts.linux.dev, 
 patches@...ts.linux.dev, Nathan Chancellor <nathan@...nel.org>
Subject: [PATCH 1/6] x86/build: Remove cc-option for GCC retpoline flags

The minimum supported version of GCC to build the x86 kernel was bumped
to GCC 8.1 in commit a3e8fe814ad1 ("x86/build: Raise the minimum GCC
version to 8.1"). '-mindirect-branch' and '-mindirect-branch-register'
were first supported in GCC 8.1, so there is no need to call cc-option
to inquire if it is supported.

Link: https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=da99fd4a3ca06b43b08ba8d96dab84e83ac90aa7
Link: https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=d543c04b795f8af4ebe5b3d5f38156ef4e5734f1
Signed-off-by: Nathan Chancellor <nathan@...nel.org>
---
 arch/x86/Makefile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 1913d342969b..ed5657395d6a 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -13,8 +13,8 @@ else
 endif
 
 ifdef CONFIG_CC_IS_GCC
-RETPOLINE_CFLAGS	:= $(call cc-option,-mindirect-branch=thunk-extern -mindirect-branch-register)
-RETPOLINE_VDSO_CFLAGS	:= $(call cc-option,-mindirect-branch=thunk-inline -mindirect-branch-register)
+RETPOLINE_CFLAGS	:= -mindirect-branch=thunk-extern -mindirect-branch-register
+RETPOLINE_VDSO_CFLAGS	:= -mindirect-branch=thunk-inline -mindirect-branch-register
 endif
 ifdef CONFIG_CC_IS_CLANG
 RETPOLINE_CFLAGS	:= -mretpoline-external-thunk

-- 
2.50.1