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 CDC3C566A for ; Sat, 30 Mar 2024 03:31:01 +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=1711769461; cv=none; b=gv7mcppCy+q29ZD/BGI6wsd2lAtLIfZ2oIeo+sKuxeLKLJW4LGhDVqUju8FvhNTRg8hqdeR3PUMvx+SV3ZurD2V38ix0TNdqc8lJilnIhKuezZjcy2mubP+RVp4OH7rW1CfXABPxPv38+84z5GK+oHl4ry8/53r7yFSg+b04jkg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711769461; c=relaxed/simple; bh=QAP1PVcw+WqXbvg+WF9YqruUyqCjlfaNJomFn29YxTM=; h=Date:To:From:Subject:Message-Id; b=pSWleB55dT3ditdrO849TfpgN2Uubcffg1ZWw7d8HYryuQy64ZceUsTI0sBjkfXnTgMfsQbQMV3I1Il+d/nKkY2BaZM5fRG6lOc9V8wjNnzsdi6/mxcRxLeqxtfd0+Z9PnOe/mcIzxgvCXABjA9gtuPfEvr759CzOgA+HggwCng= 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=TezpB6/M; 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="TezpB6/M" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A143CC433F1; Sat, 30 Mar 2024 03:31:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1711769461; bh=QAP1PVcw+WqXbvg+WF9YqruUyqCjlfaNJomFn29YxTM=; h=Date:To:From:Subject:From; b=TezpB6/MEtcou28XqoR9TOgd4w1LmNEJQF2+ulLG03gSM3nyGtnsirUzWRaK5++Ar +D3bAOpoWxn1Bs0V6SaJN19OmUbn/8C2UzyJxrVD7sUh7p2MGA4+a5HkpFlcOxU8Y1 nI/Wq6KlR22x2+/Yv0zMtOArvC0QB+rgUvZtcGdI= Date: Fri, 29 Mar 2024 20:31:01 -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: + x86-implement-arch_has_kernel_fpu_support.patch added to mm-nonmm-unstable branch Message-Id: <20240330033101.A143CC433F1@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: x86: implement ARCH_HAS_KERNEL_FPU_SUPPORT has been added to the -mm mm-nonmm-unstable branch. Its filename is x86-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/x86-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: x86: implement ARCH_HAS_KERNEL_FPU_SUPPORT Date: Fri, 29 Mar 2024 00:18:25 -0700 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 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/x86/Kconfig | 1 + arch/x86/Makefile | 20 ++++++++++++++++++++ arch/x86/include/asm/fpu.h | 13 +++++++++++++ 3 files changed, 34 insertions(+) --- /dev/null +++ a/arch/x86/include/asm/fpu.h @@ -0,0 +1,13 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2023 SiFive + */ + +#ifndef _ASM_X86_FPU_H +#define _ASM_X86_FPU_H + +#include + +#define kernel_fpu_available() true + +#endif /* ! _ASM_X86_FPU_H */ --- a/arch/x86/Kconfig~x86-implement-arch_has_kernel_fpu_support +++ a/arch/x86/Kconfig @@ -83,6 +83,7 @@ config X86 select ARCH_HAS_FORTIFY_SOURCE select ARCH_HAS_GCOV_PROFILE_ALL select ARCH_HAS_KCOV if X86_64 + select ARCH_HAS_KERNEL_FPU_SUPPORT select ARCH_HAS_MEM_ENCRYPT select ARCH_HAS_MEMBARRIER_SYNC_CORE select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS --- a/arch/x86/Makefile~x86-implement-arch_has_kernel_fpu_support +++ a/arch/x86/Makefile @@ -74,6 +74,26 @@ KBUILD_CFLAGS += -mno-sse -mno-mmx -mno- KBUILD_RUSTFLAGS += --target=$(objtree)/scripts/target.json KBUILD_RUSTFLAGS += -Ctarget-feature=-sse,-sse2,-sse3,-ssse3,-sse4.1,-sse4.2,-avx,-avx2 +# +# CFLAGS for compiling floating point code inside the kernel. +# +CC_FLAGS_FPU := -msse -msse2 +ifdef CONFIG_CC_IS_GCC +# Stack alignment mismatch, proceed with caution. +# GCC < 7.1 cannot compile code using `double` and -mpreferred-stack-boundary=3 +# (8B stack alignment). +# See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53383 +# +# The "-msse" in the first argument is there so that the +# -mpreferred-stack-boundary=3 build error: +# +# -mpreferred-stack-boundary=3 is not between 4 and 12 +# +# can be triggered. Otherwise gcc doesn't complain. +CC_FLAGS_FPU += -mhard-float +CC_FLAGS_FPU += $(call cc-option,-msse -mpreferred-stack-boundary=3,-mpreferred-stack-boundary=4) +endif + ifeq ($(CONFIG_X86_KERNEL_IBT),y) # # Kernel IBT has S_CET.NOTRACK_EN=0, as such the compilers must not generate _ 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