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

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Date:   Thu, 22 Jul 2021 19:32:10 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Valentin Schneider <valentin.schneider@....com>
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 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>

> [   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.

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