linux-kernel - Re: arm64 hitting BUG in arch

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Date:	Wed, 10 Dec 2014 14:43:54 -0800
From:	Sonny Rao <sonnyrao@...omium.org>
To:	Mark Salter <msalter@...hat.com>
Cc:	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	yingjoe.chen@...iatek.com
Subject: Re: arm64 hitting BUG in arch_timer.h

On Wed, Dec 10, 2014 at 12:56 PM, Mark Salter <msalter@...hat.com> wrote:
> Using Linus' tree from this morning, I am hitting:
>
>    [    0.000000] BUG: failure at ./arch/arm64/include/asm/arch_timer.h:112/arch_counter_get_cntpct!
>
> This is triggered by commit 0b46b8a718 ("clocksource: arch_timer: Fix
> code to use physical timers when requested") which addresses an armv7
> problem. Arm64 wants to always use a virtual timer. I used this to avoid
> the BUG and get a booting kernel:
>
> diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch
> index 71846f9..4d8a01e 100644
> --- a/drivers/clocksource/arm_arch_timer.c
> +++ b/drivers/clocksource/arm_arch_timer.c
> @@ -468,7 +468,7 @@ static void __init arch_counter_register(unsigned type)
>
>         /* Register the CP15 based counter if we have one */
>         if (type & ARCH_CP15_TIMER) {
> -               if (arch_timer_use_virtual)
> +               if (IS_ENABLED(CONFIG_ARM64) || arch_timer_use_virtual)
>                         arch_timer_read_counter = arch_counter_get_cntvct;
>                 else
>                         arch_timer_read_counter = arch_counter_get_cntpct;
>
>

Yes Catalin has prepared a similar patch:
https://patchwork.kernel.org/patch/5468031/
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