linux-kernel - Re: [PATCH] arm: Initialize hrtimer-based broadcast clockevent

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Message-ID: <8f2fd3b9-416a-992e-5ca6-fc83aad5700d@siemens.com>
Date:   Thu, 1 Mar 2018 07:04:17 +0100
From:   Jan Kiszka <jan.kiszka@...mens.com>
To:     Russell King <linux@...linux.org.uk>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Jailhouse <jailhouse-dev@...glegroups.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm: Initialize hrtimer-based broadcast clockevent

On 2018-01-22 07:06, Jan Kiszka wrote:
> Analogously to 9358d755bd5c, this registers a broadcast clockevent in
> case no hardware broadcast timer is available and the per-CPU timers can
> be stopped in deep power states.
> 
> Partitions of the Jailhouse hypervisor fall in this category.
> Registering the workaround timer allows to enter high-resolution mode in
> that case.
> 
> Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
> ---
>  arch/arm/kernel/time.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/arch/arm/kernel/time.c b/arch/arm/kernel/time.c
> index 629f8e9981f1..0a45d861ef8e 100644
> --- a/arch/arm/kernel/time.c
> +++ b/arch/arm/kernel/time.c
> @@ -12,6 +12,7 @@
>   *  reading the RTC at bootup, etc...
>   */
>  #include <linux/clk-provider.h>
> +#include <linux/clockchips.h>
>  #include <linux/clocksource.h>
>  #include <linux/errno.h>
>  #include <linux/export.h>
> @@ -121,5 +122,7 @@ void __init time_init(void)
>  		of_clk_init(NULL);
>  #endif
>  		timer_probe();
> +
> +		tick_setup_hrtimer_broadcast();
>  	}
>  }
> 

Gentle ping, just to avoid that this falls through the cracks because
it's so small.

Jan

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