original_kernel/include/linux/fpu.h

/* SPDX-License-Identifier: GPL-2.0 */

#ifndef _LINUX_FPU_H
#define _LINUX_FPU_H

#ifdef _LINUX_FPU_COMPILATION_UNIT
#error FP code must be compiled separately. See Documentation/core-api/floating-point.rst.
#endif

#include <asm/fpu.h>

#endif
arch: add ARCH_HAS_KERNEL_FPU_SUPPORT Several architectures provide an API to enable the FPU and run floating-point SIMD code in kernel space. However, the function names, header locations, and semantics are inconsistent across architectures, and FPU support may be gated behind other Kconfig options. provide a standard way for architectures to declare that kernel space FPU support is available. Architectures selecting this option must implement what is currently the most common API (kernel_fpu_begin() and kernel_fpu_end(), plus a new function kernel_fpu_available()) and provide the appropriate CFLAGS for compiling floating-point C code. Link: https://lkml.kernel.org/r/20240329072441.591471-2-samuel.holland@sifive.com Signed-off-by: Samuel Holland <samuel.holland@sifive.com> Suggested-by: Christoph Hellwig <hch@lst.de> 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> 2024-03-29 15:18:16 +08:00			`/* SPDX-License-Identifier: GPL-2.0 */`

			`#ifndef _LINUX_FPU_H`
			`#define _LINUX_FPU_H`

			`#ifdef _LINUX_FPU_COMPILATION_UNIT`
			`#error FP code must be compiled separately. See Documentation/core-api/floating-point.rst.`
			`#endif`

			`#include <asm/fpu.h>`

			`#endif`