linux-kernel - Re: [PATCH v2 3/3] timekeeping: Add CONFIG_HAS_PERSISTENT

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Message-ID: <50FEED65.6050107@linaro.org>
Date:	Tue, 22 Jan 2013 11:49:57 -0800
From:	John Stultz <john.stultz@...aro.org>
To:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
CC:	Feng Tang <feng.tang@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] timekeeping: Add CONFIG_HAS_PERSISTENT_CLOCK option

On 01/22/2013 11:44 AM, Jason Gunthorpe wrote:
> On Tue, Jan 15, 2013 at 11:50:18AM -0800, John Stultz wrote:
>> On 01/15/2013 08:09 AM, Feng Tang wrote:
>>> Make the persistent clock check a kernel config option, so that some
>>> platform can explicitely select it, also make CONFIG_RTC_HCTOSYS depends
>>> on its non-existence, which could prevent the persistent clock and RTC
>>> code from doing similar thing twice during system's init/suspend/resume
>>> phases.
>>>
>>> If the CONFIG_HAS_PERSISTENT_CLOCK=n, then no change happens for kernel
>>> which still does the persistent clock check in timekeeping_init().
>>>
>>> Cc: Thomas Gleixner <tglx@...utronix.de>
>>> Suggested-by: John Stultz <john.stultz@...aro.org>
>>> Signed-off-by: Feng Tang <feng.tang@...el.com>
>> Applied. I also added a dependency for Jason's CONFIG_RTC_SYSTOHC.
> Sort of an ugly config name, since I gather ARM should always set this
> to 'n'...
>
> CONFIG_USE_ONLY_PERSISTENT_CLOCK ?
(Sigh. I got this seemingly microseconds after I sent the pull request :)

So yea, fair point, there could be some confusion. But 
ONLY_PERSISTENT_CLOCK isn't quite right either,  more like 
CONFIG_HAS_PERSISTENT_CLOCK_ALWAYS or something.

Hrm. Let me think on it for a bit, and feel free to suggest further 
improvements.

thanks
-john
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