linux-kernel - Re: ARM BCM53573 SoC hangs/lockups caused by locks/clock/random changes

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Message-ID: <CAMuHMdVTQdj5OUHX7em3Zhiy1n935DVJBb0LKk1+_azmzQNxxg@mail.gmail.com>
Date:   Mon, 4 Sep 2023 10:58:03 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Rafał Miłecki <zajec5@...il.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Florian Fainelli <f.fainelli@...il.com>,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        openwrt-devel@...ts.openwrt.org,
        bcm-kernel-feedback-list@...adcom.com
Subject: Re: ARM BCM53573 SoC hangs/lockups caused by locks/clock/random changes

Hi Rafał,

On Mon, Sep 4, 2023 at 10:35 AM Rafał Miłecki <zajec5@...il.com> wrote:
> 2. Clock (arm,armv7-timer)
>
> While comparing main clock in Broadcom's SDK with upstream one I noticed
> a tiny difference: mask value. I don't know it it makes any sense but
> switching from CLOCKSOURCE_MASK(56) to CLOCKSOURCE_MASK(64) in
> arm_arch_timer.c (to match SDK) increases average uptime (time before a
> hang/lockup happens) from 4 minutes to 36 minutes.

That code path is used only for type != ARCH_TIMER_TYPE_CP15,
but your kernel log

    arch_timer: cp15 timer(s) running at 0.03MHz (virt).

suggest that type == ARCH_TIMER_TYPE_CP15?!?

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds