From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 77ABA7F8 for ; Sat, 30 Mar 2024 03:30:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711769449; cv=none; b=BI83ZTM5/t/pAACDcNuZNmHEu4virTlLdSSqsUNMpEwbf3r4gPlxQh1OfV8D4/y/icWTtwDWTCDMRHt5u7camTaCcrZ2cjrSOVfQsf75u/uXVmtkLN5Y0zpJC1HcebxK1xe2n+JRh+nWdARSWhOQIfqoqxIU4aV2rdfIr6hpLpU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711769449; c=relaxed/simple; bh=dONI3SnIAeFLupnwpFo1PpO4O0AH+DUvFcr5p+RLuxk=; h=Date:To:From:Subject:Message-Id; b=qk/UMwu0aHtbNRIVCVMewp9gEgwx+/5vWuAKCFptrLuGYeWZoZ1DYagi/XPI/Q5Tl0DEqgIAP/+iLdp9UMhBgZ8vJ1ZfJmITb6xVu2W7SOzZOCwA7PVtb0qIO3UeaFcg5rsk6vi2DmLRT4tNHKufZeTTgfmd71+feKloKHWqSF8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=zs+gHwdN; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="zs+gHwdN" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E33B4C43390; Sat, 30 Mar 2024 03:30:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1711769449; bh=dONI3SnIAeFLupnwpFo1PpO4O0AH+DUvFcr5p+RLuxk=; h=Date:To:From:Subject:From; b=zs+gHwdNKYn4RtbCUMP0sD23LkhXLYY9JmJjgJSzFusp+gs5hUZ98WQ9kPt+Es3/c eQLOJ8+wmYDzq18HNrVkVS9RcqGs59Wz09D0TdtDYVzEZxYo47xNW0xgODR007pgUr ZuUlXHs16wQs1vt8Ox9Jc54sm9lXQDsUi2J883B4= Date: Fri, 29 Mar 2024 20:30:48 -0700 To: mm-commits@vger.kernel.org,will@kernel.org,tglx@linutronix.de,palmer@rivosinc.com,nicolas@fjasle.eu,nathan@kernel.org,mpe@ellerman.id.au,mingo@redhat.com,masahiroy@kernel.org,linux@armlinux.org.uk,hch@lst.de,git@xen0n.name,dave.hansen@linux.intel.com,corbet@lwn.net,chenhuacai@kernel.org,catalin.marinas@arm.com,bp@alien8.de,alexander.deucher@amd.com,samuel.holland@sifive.com,akpm@linux-foundation.org From: Andrew Morton Subject: + arm64-implement-arch_has_kernel_fpu_support.patch added to mm-nonmm-unstable branch Message-Id: <20240330033048.E33B4C43390@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: arm64: implement ARCH_HAS_KERNEL_FPU_SUPPORT has been added to the -mm mm-nonmm-unstable branch. Its filename is arm64-implement-arch_has_kernel_fpu_support.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/arm64-implement-arch_has_kernel_fpu_support.patch This patch will later appear in the mm-nonmm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days ------------------------------------------------------ From: Samuel Holland Subject: arm64: implement ARCH_HAS_KERNEL_FPU_SUPPORT Date: Fri, 29 Mar 2024 00:18:19 -0700 arm64 provides an equivalent to the common kernel-mode FPU API, but in a different header and using different function names. Add a wrapper header, and export CFLAGS adjustments as found in lib/raid6/Makefile. Link: https://lkml.kernel.org/r/20240329072441.591471-5-samuel.holland@sifive.com Signed-off-by: Samuel Holland Reviewed-by: Christoph Hellwig Cc: Alex Deucher Cc: Borislav Petkov (AMD) Cc: Catalin Marinas Cc: Dave Hansen Cc: Huacai Chen Cc: Ingo Molnar Cc: Jonathan Corbet Cc: Masahiro Yamada Cc: Michael Ellerman Cc: Nathan Chancellor Cc: Nicolas Schier Cc: Palmer Dabbelt Cc: Russell King Cc: Thomas Gleixner Cc: WANG Xuerui Cc: Will Deacon Signed-off-by: Andrew Morton --- arch/arm64/Kconfig | 1 + arch/arm64/Makefile | 9 ++++++++- arch/arm64/include/asm/fpu.h | 15 +++++++++++++++ 3 files changed, 24 insertions(+), 1 deletion(-) --- /dev/null +++ a/arch/arm64/include/asm/fpu.h @@ -0,0 +1,15 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2023 SiFive + */ + +#ifndef __ASM_FPU_H +#define __ASM_FPU_H + +#include + +#define kernel_fpu_available() cpu_has_neon() +#define kernel_fpu_begin() kernel_neon_begin() +#define kernel_fpu_end() kernel_neon_end() + +#endif /* ! __ASM_FPU_H */ --- a/arch/arm64/Kconfig~arm64-implement-arch_has_kernel_fpu_support +++ a/arch/arm64/Kconfig @@ -30,6 +30,7 @@ config ARM64 select ARCH_HAS_GCOV_PROFILE_ALL select ARCH_HAS_GIGANTIC_PAGE select ARCH_HAS_KCOV + select ARCH_HAS_KERNEL_FPU_SUPPORT if KERNEL_MODE_NEON select ARCH_HAS_KEEPINITRD select ARCH_HAS_MEMBARRIER_SYNC_CORE select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS --- a/arch/arm64/Makefile~arm64-implement-arch_has_kernel_fpu_support +++ a/arch/arm64/Makefile @@ -36,7 +36,14 @@ ifeq ($(CONFIG_BROKEN_GAS_INST),y) $(warning Detected assembler with broken .inst; disassembly will be unreliable) endif -KBUILD_CFLAGS += -mgeneral-regs-only \ +# The GCC option -ffreestanding is required in order to compile code containing +# ARM/NEON intrinsics in a non C99-compliant environment (such as the kernel) +CC_FLAGS_FPU := -ffreestanding +# Enable +CC_FLAGS_FPU += -isystem $(shell $(CC) -print-file-name=include) +CC_FLAGS_NO_FPU := -mgeneral-regs-only + +KBUILD_CFLAGS += $(CC_FLAGS_NO_FPU) \ $(compat_vdso) $(cc_has_k_constraint) KBUILD_CFLAGS += $(call cc-disable-warning, psabi) KBUILD_AFLAGS += $(compat_vdso) _ Patches currently in -mm which might be from samuel.holland@sifive.com are x86-fpu-fix-asm-fpu-typesh-include-guard.patch arch-add-arch_has_kernel_fpu_support.patch arm-implement-arch_has_kernel_fpu_support.patch arm-crypto-use-cc_flags_fpu-for-neon-cflags.patch arm64-implement-arch_has_kernel_fpu_support.patch arm64-crypto-use-cc_flags_fpu-for-neon-cflags.patch lib-raid6-use-cc_flags_fpu-for-neon-cflags.patch loongarch-implement-arch_has_kernel_fpu_support.patch powerpc-implement-arch_has_kernel_fpu_support.patch x86-implement-arch_has_kernel_fpu_support.patch riscv-add-support-for-kernel-mode-fpu.patch drm-amd-display-use-arch_has_kernel_fpu_support.patch selftests-fpu-move-fp-code-to-a-separate-translation-unit.patch selftests-fpu-allow-building-on-other-architectures.patch