Messages in this thread | | | From | Ard Biesheuvel <> | Date | Fri, 23 Jul 2021 16:12:49 +0200 | Subject | Re: [PATCH 0/3] sched, x86, arm64: PREEMPT_RT, FPU and preemption |
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On Thu, 22 Jul 2021 at 19:53, Valentin Schneider <valentin.schneider@arm.com> wrote: > > 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. > > Cheers, > Valentin > > 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 >
Thanks for fixing this.
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
> 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(-) > > -- > 2.25.1 >
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