linux-kernel - [PATCH 0/4] x86/fpu: Reduce unnecessary FNINIT and MXCSR usage

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Date:   Sun, 17 Jan 2021 22:20:37 -0800
From:   Andy Lutomirski <luto@...nel.org>
To:     x86@...nel.org
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Krzysztof Mazur <krzysiek@...lesie.net>,
        Krzysztof Olędzki <ole@....pl>,
        Arnd Bergmann <arnd@...db.de>,
        Andy Lutomirski <luto@...nel.org>
Subject: [PATCH 0/4] x86/fpu: Reduce unnecessary FNINIT and MXCSR usage

This series fixes two regressions: a boot failure on AMD K7 and a
performance regression on everything.

I did a double-take here -- the regressions were reported by different
people, both named Krzysztof :)

Andy Lutomirski (4):
  x86/fpu: Add kernel_fpu_begin_mask() to selectively initialize state
  x86/mmx: Use KFPU_MMX for MMX string operations
  x86/fpu: Make the EFI FPU calling convention explicit
  x86/fpu/64: Don't FNINIT in kernel_fpu_begin()

 arch/x86/include/asm/efi.h     |  4 ++--
 arch/x86/include/asm/fpu/api.h | 35 ++++++++++++++++++++++++++++++++--
 arch/x86/kernel/fpu/core.c     | 17 +++++++++++------
 arch/x86/lib/mmx_32.c          | 10 +++++-----
 arch/x86/platform/efi/efi_64.c |  2 +-
 5 files changed, 52 insertions(+), 16 deletions(-)

-- 
2.29.2