linux-kernel - [PATCH 4/6] x86/build: Remove cc-option from -mno-fp-ret-in-387

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Message-Id: <20250814-x86-min-ver-cleanups-v1-4-ff7f19457523@kernel.org>
Date: Thu, 14 Aug 2025 18:31:40 -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 4/6] x86/build: Remove cc-option from -mno-fp-ret-in-387

This has been supported in GCC for forever and clang gained support for
it as an alias of '-mno-x87' in LLVM 14. Now that x86 requires LLVM 15
or newer since commit 7861640aac52 ("x86/build: Raise the minimum LLVM
version to 15.0.0"), this flag can be unconditionally added, saving a
compiler invocation.

Link: https://github.com/llvm/llvm-project/commit/a9fba2be35db674971382e38b99a31403444d9bf
Signed-off-by: Nathan Chancellor <nathan@...nel.org>
---
 arch/x86/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 0c82a610fb54..1bbf943fe9e1 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -148,7 +148,7 @@ else
 
         # Don't autogenerate traditional x87 instructions
         KBUILD_CFLAGS += -mno-80387
-        KBUILD_CFLAGS += $(call cc-option,-mno-fp-ret-in-387)
+        KBUILD_CFLAGS += -mno-fp-ret-in-387
 
         # By default gcc and clang use a stack alignment of 16 bytes for x86.
         # However the standard kernel entry on x86-64 leaves the stack on an

-- 
2.50.1