x86: implement ARCH_HAS_KERNEL_FPU_SUPPORT
x86 already provides kernel_fpu_begin() and kernel_fpu_end(), but in a different header. Add a wrapper header, and export the CFLAGS adjustments as found in lib/Makefile. Link: https://lkml.kernel.org/r/20240329072441.591471-11-samuel.holland@sifive.com Signed-off-by: Samuel Holland <samuel.holland@sifive.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Acked-by: Christian König <christian.koenig@amd.com> Cc: Alex Deucher <alexander.deucher@amd.com> Cc: Borislav Petkov (AMD) <bp@alien8.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Huacai Chen <chenhuacai@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Masahiro Yamada <masahiroy@kernel.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Nathan Chancellor <nathan@kernel.org> Cc: Nicolas Schier <nicolas@fjasle.eu> Cc: Palmer Dabbelt <palmer@rivosinc.com> Cc: Russell King <linux@armlinux.org.uk> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: WANG Xuerui <git@xen0n.name> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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@ -85,6 +85,7 @@ config X86
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select ARCH_HAS_FORTIFY_SOURCE
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select ARCH_HAS_GCOV_PROFILE_ALL
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select ARCH_HAS_KCOV if X86_64
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select ARCH_HAS_KERNEL_FPU_SUPPORT
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select ARCH_HAS_MEM_ENCRYPT
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select ARCH_HAS_MEMBARRIER_SYNC_CORE
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select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS
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@ -74,6 +74,26 @@ KBUILD_CFLAGS += -mno-sse -mno-mmx -mno-sse2 -mno-3dnow -mno-avx
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KBUILD_RUSTFLAGS += --target=$(objtree)/scripts/target.json
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KBUILD_RUSTFLAGS += -Ctarget-feature=-sse,-sse2,-sse3,-ssse3,-sse4.1,-sse4.2,-avx,-avx2
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#
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# CFLAGS for compiling floating point code inside the kernel.
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#
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CC_FLAGS_FPU := -msse -msse2
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ifdef CONFIG_CC_IS_GCC
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# Stack alignment mismatch, proceed with caution.
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# GCC < 7.1 cannot compile code using `double` and -mpreferred-stack-boundary=3
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# (8B stack alignment).
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# See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53383
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#
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# The "-msse" in the first argument is there so that the
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# -mpreferred-stack-boundary=3 build error:
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#
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# -mpreferred-stack-boundary=3 is not between 4 and 12
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#
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# can be triggered. Otherwise gcc doesn't complain.
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CC_FLAGS_FPU += -mhard-float
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CC_FLAGS_FPU += $(call cc-option,-msse -mpreferred-stack-boundary=3,-mpreferred-stack-boundary=4)
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endif
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ifeq ($(CONFIG_X86_KERNEL_IBT),y)
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#
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# Kernel IBT has S_CET.NOTRACK_EN=0, as such the compilers must not generate
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@ -0,0 +1,13 @@
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/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2023 SiFive
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*/
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#ifndef _ASM_X86_FPU_H
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#define _ASM_X86_FPU_H
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#include <asm/fpu/api.h>
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#define kernel_fpu_available() true
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#endif /* ! _ASM_X86_FPU_H */
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