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

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Message-ID: <20210527115646.GD22019@willie-the-truck>
Date:   Thu, 27 May 2021 12:56:46 +0100
From:   Will Deacon <will@...nel.org>
To:     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, tglx@...utronix.de
Subject: Re: [PATCH v2 2/5] tick/broadcast: Split
 __tick_broadcast_oneshot_control() into a helper

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. The approach I have taken here (of printing
<NULL>) follows what is done elsewhere for the timer readout and probably
helps with parsing this stuff.

Will