From: Ard Biesheuvel <ardb@kernel.org> To: Valentin Schneider <valentin.schneider@arm.com> Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Linux ARM <linux-arm-kernel@lists.infradead.org>, linux-rt-users@vger.kernel.org, X86 ML <x86@kernel.org>, 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> Subject: Re: [PATCH 0/3] sched, x86, arm64: PREEMPT_RT, FPU and preemption Date: Fri, 23 Jul 2021 16:12:49 +0200 [thread overview] Message-ID: <CAMj1kXE8Yyn0orHe3DjFvCQ3k5mUKJF10BcJ3fJTessRoMShBA@mail.gmail.com> (raw) In-Reply-To: <20210722175157.1367122-1-valentin.schneider@arm.com> 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 >
WARNING: multiple messages have this Message-ID (diff)
From: Ard Biesheuvel <ardb@kernel.org> To: Valentin Schneider <valentin.schneider@arm.com> Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Linux ARM <linux-arm-kernel@lists.infradead.org>, linux-rt-users@vger.kernel.org, X86 ML <x86@kernel.org>, 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> Subject: Re: [PATCH 0/3] sched, x86, arm64: PREEMPT_RT, FPU and preemption Date: Fri, 23 Jul 2021 16:12:49 +0200 [thread overview] Message-ID: <CAMj1kXE8Yyn0orHe3DjFvCQ3k5mUKJF10BcJ3fJTessRoMShBA@mail.gmail.com> (raw) In-Reply-To: <20210722175157.1367122-1-valentin.schneider@arm.com> 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 > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-07-23 14:13 UTC|newest] Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-07-22 17:51 [PATCH 0/3] sched, x86, arm64: PREEMPT_RT, FPU and preemption Valentin Schneider 2021-07-22 17:51 ` Valentin Schneider 2021-07-22 17:51 ` [PATCH 1/3] sched/preempt: Introduce preempt_{enable, disable}_bh() Valentin Schneider 2021-07-22 17:51 ` 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 ` Valentin Schneider 2021-07-22 17:51 ` [PATCH 3/3] arm64/fpsimd: Fix FPSIMD context handling vs PREEMPT_RT Valentin Schneider 2021-07-22 17:51 ` Valentin Schneider 2021-07-22 18:32 ` Mark Brown 2021-07-22 18:32 ` Mark Brown 2021-07-23 11:07 ` Valentin Schneider 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 2021-07-22 20:11 ` Andrew Halaney 2021-07-23 14:12 ` Ard Biesheuvel [this message] 2021-07-23 14:12 ` Ard Biesheuvel
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