linux-kernel - Re: CONFIG_RTC_HCTOSYS lost on x86 with ALWAYS_USE_PERSISTENT

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Message-ID: <CAPXgP10OJGHwZZHCtUMZfnSzj2cKJmg6NGg2pPKiuHWPKuuo-Q@mail.gmail.com>
Date:	Wed, 24 Apr 2013 18:32:47 +0200
From:	Kay Sievers <kay@...y.org>
To:	John Stultz <john.stultz@...aro.org>
Cc:	Alexander Holler <holler@...oftware.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Feng Tang <feng.tang@...el.com>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Subject: Re: CONFIG_RTC_HCTOSYS lost on x86 with ALWAYS_USE_PERSISTENT_CLOCK changes?

On Wed, Apr 24, 2013 at 6:07 PM, John Stultz <john.stultz@...aro.org> wrote:

> So summarizing the above, because as much as I'm aware, its always been
> redundant and unnecessary on x86.  Thus being able at build time to mark it
> as unnecessary was attractive, since it reduced the code paths running at
> suspend/resume.
>
> That said, Kay's concerns about userland implications (basically the
> userland side effects of SYSTOHC being enabled) give me pause, so I may
> revert the HAS_PERSISTENT_CLOCK on x86 change.

Thanks a lot for all the missing details!

No, I think that all makes too much sense to revert it. Let's just
find a way to solve it properly. I don't think it is of any pressing
importance to keep the old behaviour, if we can still provide the
functionality today.

I'll continue replying in the later mail ...

Kay
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