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Date:   Thu, 22 Jul 2021 18:51:54 +0100
From:   Valentin Schneider <>
Cc:     Catalin Marinas <>,
        Will Deacon <>,
        Thomas Gleixner <>,
        Steven Rostedt <>,
        Daniel Bristot de Oliveira <>,
        "Peter Zijlstra (Intel)" <>,
        Ingo Molnar <>, Borislav Petkov <>,
        "H. Peter Anvin" <>, Mark Brown <>,
        Dave Martin <>,
        Ard Biesheuvel <>
Subject: [PATCH 0/3] sched, x86, arm64: PREEMPT_RT, FPU and preemption

Hi folks,

This stems from some more v5.13-rt1 breakage on arm64. This time per-CPU access
safety isn't sufficient, we really need to keep preemption disabled.

In a happy accident I stumbled on

  cba08c5dc6dc ("x86/fpu: Make kernel FPU protection RT friendly")

so I packaged what was done there into some common helpers and plastered them
over the problematic areas.


Valentin Schneider (3):
  sched/preempt: Introduce preempt_{enable, disable}_bh()
  x86/fpu: Make FPU protection reuse common helper
  arm64/fpsimd: Fix FPSIMD context handling vs PREEMPT_RT

 arch/arm64/kernel/fpsimd.c     |  6 ++++--
 arch/x86/include/asm/fpu/api.h | 19 ++-----------------
 include/linux/bottom_half.h    | 26 ++++++++++++++++++++++++++
 3 files changed, 32 insertions(+), 19 deletions(-)


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