linux-kernel - Re: [PATCH v2 2/5] tick/broadcast: Split __tick_broadcast_oneshot

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Message-ID: <87k0nf3rjz.ffs@nanos.tec.linutronix.de>
Date:   Mon, 31 May 2021 16:29:20 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Will Deacon <will@...nel.org>, Xin Hao <xhao@...ux.alibaba.com>
Cc:     fweisbec@...il.com, john.stultz@...aro.org,
        kernel-team@...roid.com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, lorenzo@...gle.com, maz@...nel.org,
        mika.penttila@...tfour.com, sboyd@...nel.org
Subject: Re: [PATCH v2 2/5] tick/broadcast: Split __tick_broadcast_oneshot_control() into a helper

On Thu, May 27 2021 at 12:56, Will Deacon wrote:

> On Thu, May 27, 2021 at 07:35:03PM +0800, Xin Hao wrote:
>> 
>> 在 2021/5/27 下午4:22, Will Deacon 写道:
>> > On Thu, May 27, 2021 at 03:23:06PM +0800, Xin Hao wrote:
>> > >       I  had backport you  tick/broadcast: Prefer per-cpu relatives patches,
>> > > 
>> > > but i did not get the true result,  the Wakeup Devices are all null, why?
>> > Probably because you don't have any suitable per-cpu timers to act as a
>> > wakeup. Do you have a per-cpu timer registered with CLOCK_EVT_FEAT_PERCPU
>> 
>> Yes, you are right, but i want to know why the timer do not support 
>> CLOCK_EVT_FEAT_PERCPU.
>
> I defer to Thomas on this one.

How should I know what kind of timers this hardware has?

Thanks,

        tglx