From: Valentin Schneider <valentin.schneider@arm.com>
To: linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-rt-users@vger.kernel.org, x86@kernel.org
Cc: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Steven Rostedt <rostedt@goodmis.org>,
Daniel Bristot de Oliveira <bristot@redhat.com>,
"Peter Zijlstra (Intel)" <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>, Borislav Petkov <bp@alien8.de>,
"H. Peter Anvin" <hpa@zytor.com>, Mark Brown <broonie@kernel.org>,
Dave Martin <Dave.Martin@arm.com>,
Ard Biesheuvel <ardb@kernel.org>
Subject: [PATCH 0/3] sched, x86, arm64: PREEMPT_RT, FPU and preemption
Date: Thu, 22 Jul 2021 18:51:54 +0100 [thread overview]
Message-ID: <20210722175157.1367122-1-valentin.schneider@arm.com> (raw)
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
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
next reply other threads:[~2021-07-22 17:53 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-22 17:51 Valentin Schneider [this message]
2021-07-22 17:51 ` [PATCH 1/3] sched/preempt: Introduce preempt_{enable, disable}_bh() Valentin Schneider
2021-07-22 17:51 ` [PATCH 2/3] x86/fpu: Make FPU protection reuse common helper Valentin Schneider
2021-07-22 17:51 ` [PATCH 3/3] arm64/fpsimd: Fix FPSIMD context handling vs PREEMPT_RT Valentin Schneider
2021-07-22 18:32 ` Mark Brown
2021-07-23 11:07 ` Valentin Schneider
2021-07-22 20:11 ` [PATCH 0/3] sched, x86, arm64: PREEMPT_RT, FPU and preemption Andrew Halaney
2021-07-23 14:12 ` Ard Biesheuvel
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