linux-kernel - Re: [PATCH 3/3] arm64/fpsimd: Fix FPSIMD context handling vs PREEMPT

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Message-ID: <875yx1mgp4.mognet@arm.com>
Date:   Fri, 23 Jul 2021 12:07:35 +0100
From:   Valentin Schneider <valentin.schneider@....com>
To:     Mark Brown <broonie@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rt-users@...r.kernel.org, x86@...nel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        "Peter Zijlstra \(Intel\)" <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Dave Martin <Dave.Martin@....com>,
        Ard Biesheuvel <ardb@...nel.org>
Subject: Re: [PATCH 3/3] arm64/fpsimd: Fix FPSIMD context handling vs PREEMPT_RT

On 22/07/21 19:32, Mark Brown wrote:
> On Thu, Jul 22, 2021 at 06:51:57PM +0100, Valentin Schneider wrote:
>> Running v5.13-rt1 on my arm64 Juno board triggers:
>
> Acked-by: Mark Brown <broonie@...nel.org>
>

Thanks!

>> [   11.337654] WARNING: CPU: 4 PID: 1 at arch/arm64/kernel/fpsimd.c:296 task_fpsimd_load (arch/arm64/kernel/fpsimd.c:296 (discriminator 1))
>> [   11.337692] Modules linked in:
>> [   11.337705] CPU: 4 PID: 1 Comm: init Not tainted 5.13.0-rt1 #52
>> [   11.337719] Hardware name: ARM Juno development board (r0) (DT)
>> [   11.337727] pstate: 40000005 (nZcv daif -PAN -UAO -TCO BTYPE=--)
>> [   11.337740] pc : task_fpsimd_load (arch/arm64/kernel/fpsimd.c:296 (discriminator 1))
>> [   11.337755] lr : task_fpsimd_load (arch/arm64/kernel/fpsimd.c:296 (discriminator 3))
>> [   11.337769] sp : ffff800012f4bdd0
>> [   11.337775] x29: ffff800012f4bdd0 x28: ffff000800160000 x27: 0000000000000000
>> [   11.337797] x26: 0000000000000000 x25: 0000000000000000 x24: ffff0008001606f0
>> [   11.337816] x23: ffff000800160000 x22: ffff000800160700 x21: ffff000800160000
>
> For readability it's probably better to not include the entire register
> contents here - the backtrace ends up about as large as the actual
> changelog, a good chunk of which is just the register contents.

Noted.