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 67C9D15219D for ; Wed, 27 Mar 2024 20:30:04 +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=1711571404; cv=none; b=T+V7ASzy8I8f1+FJliotGKv/59XC+q5om9Ecgqn9B2tRQnOh3iwsg1w3tLG+WmI1ghS+0wRa+BXPXlnid6kGhaPaknZoTx6PPX6EETw6ZUWFXDd84iVphez89XDc5NQCX2YVaarWmeVu/sdNSeOXBPn9N6wMTdaEuMcrtyXcgos= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711571404; c=relaxed/simple; bh=8RaJKwIMGXh2NyoU/AUy5SAFwU1s+4AtRCDkRC25zBI=; h=Date:To:From:Subject:Message-Id; b=gdpISSgag2b+ZPI/d3rheSSlj1IF5grxztGbL4d6OOTL0O6bc1sUs97c8fOT+2Dn42GbCA9dIfbHdRzim91UejktB3lsweh442lcFi/jedam4ddyEdQSKHj/gqs7jaya48Rf4x9TnAnrqZBgPWDpZb69eLaa5zlr3gnQR7BKFec= 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=TTMAz7xf; 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="TTMAz7xf" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D4A37C433C7; Wed, 27 Mar 2024 20:30:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1711571403; bh=8RaJKwIMGXh2NyoU/AUy5SAFwU1s+4AtRCDkRC25zBI=; h=Date:To:From:Subject:From; b=TTMAz7xfOWbHm5S/ZbzCL3bkRb4PtIrSl9CxZi4vdlXT61GQbDBMLxxv0lr5BpK55 QbSf4zSTIb0JQ4Ke6YtHM/1GfR91MRNFVQS2GODc/vMN+0PKC4Snc3MIB0C+pAsGP1 xHH6H7ZFe5dGj1nPq5uLFo7x976+2Dh6MzQoP/3o= Date: Wed, 27 Mar 2024 13:30:03 -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: + arm-implement-arch_has_kernel_fpu_support.patch added to mm-nonmm-unstable branch Message-Id: <20240327203003.D4A37C433C7@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: ARM: implement ARCH_HAS_KERNEL_FPU_SUPPORT has been added to the -mm mm-nonmm-unstable branch. Its filename is arm-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/arm-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: ARM: implement ARCH_HAS_KERNEL_FPU_SUPPORT Date: Wed, 27 Mar 2024 13:00:33 -0700 ARM 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/20240327200157.1097089-3-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/arm/Kconfig | 1 + arch/arm/Makefile | 7 +++++++ arch/arm/include/asm/fpu.h | 15 +++++++++++++++ 3 files changed, 23 insertions(+) --- /dev/null +++ a/arch/arm/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/arm/Kconfig~arm-implement-arch_has_kernel_fpu_support +++ a/arch/arm/Kconfig @@ -15,6 +15,7 @@ config ARM select ARCH_HAS_FORTIFY_SOURCE select ARCH_HAS_KEEPINITRD select ARCH_HAS_KCOV + select ARCH_HAS_KERNEL_FPU_SUPPORT if KERNEL_MODE_NEON select ARCH_HAS_MEMBARRIER_SYNC_CORE select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE select ARCH_HAS_PTE_SPECIAL if ARM_LPAE --- a/arch/arm/Makefile~arm-implement-arch_has_kernel_fpu_support +++ a/arch/arm/Makefile @@ -130,6 +130,13 @@ endif # Accept old syntax despite ".syntax unified" AFLAGS_NOWARN :=$(call as-option,-Wa$(comma)-mno-warn-deprecated,-Wa$(comma)-W) +# 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 $(CC) -print-file-name=include) +CC_FLAGS_FPU += -march=armv7-a -mfloat-abi=softfp -mfpu=neon + ifeq ($(CONFIG_THUMB2_KERNEL),y) CFLAGS_ISA :=-Wa,-mimplicit-it=always $(AFLAGS_NOWARN) AFLAGS_ISA :=$(CFLAGS_ISA) -Wa$(comma)-mthumb _ Patches currently in -mm which might be from samuel.holland@sifive.com are 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