linux-kernel - Re: [PATCH] clockevents/drivers/i8253: Do not zero timer counter in shutdown

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Message-ID: <871q382b0v.ffs@tglx>
Date: Thu, 01 Aug 2024 23:22:56 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: David Woodhouse <dwmw2@...radead.org>, lirongqing@...du.com,
 seanjc@...gle.com, kys@...rosoft.com, haiyangz@...rosoft.com,
 wei.liu@...nel.org, decui@...rosoft.com, mingo@...hat.com, bp@...en8.de,
 dave.hansen@...ux.intel.com, x86@...nel.org, linux-hyperv@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clockevents/drivers/i8253: Do not zero timer counter in
 shutdown

On Thu, Aug 01 2024 at 21:49, David Woodhouse wrote:
> On Thu, 2024-08-01 at 22:00 +0200, Thomas Gleixner wrote:
>> > I justify my cowardice on the basis that it doesn't *matter* if a
>> > hardware implementation is still toggling the IRQ pin; in that case
>> > it's only a few irrelevant transistors which are busy, and it doesn't
>> > translate to steal time.
>> 
>> On real hardware it translates to power...
>
> Perhaps, although I'd guess it's a negligible amount. Still, happy to
> be brave and make it unconditional. Want a new version of the patch?

Let'ss fix the shutdown sequence first (See Michaels latest mail) and
then do the clockevents_i8253_init() change on top.

Thanks,

        tglx