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

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Message-ID: <e24a907f-d016-5587-a62e-0046f60d9536@siemens.com>
Date:   Mon, 11 Jun 2018 07:42:04 +0200
From:   Jan Kiszka <jan.kiszka@...mens.com>
To:     Russell King <linux@...linux.org.uk>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Arnd Bergmann <arnd@...db.de>
Cc:     Jailhouse <jailhouse-dev@...glegroups.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm: Initialize hrtimer-based broadcast clockevent

On 2018-04-04 17:54, Jan Kiszka wrote:
> On 2018-03-01 07:04, Jan Kiszka wrote:
>> 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.
>>
> 
> 2nd ping. Should this patch be routed via ARM or rather some tip/timers
> tree?
> 

3rd try: Could someone have a look at this and merge it - or at least
ack it in order to move forward?

Thanks,
Jan