linux-kernel - Re: [PATCH] time: Revert ALWAYS_USE_PERSISTENT

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Date:	Thu, 25 Apr 2013 14:30:45 +0800
From:	Feng Tang <feng.tang@...el.com>
To:	John Stultz <john.stultz@...aro.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	stable <stable@...r.kernel.org>, Kay Sievers <kay@...y.org>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] time: Revert ALWAYS_USE_PERSISTENT_CLOCK compile time
 optimizaitons

On Wed, Apr 24, 2013 at 11:32:56AM -0700, John Stultz wrote:
> Kay Sievers noted that the ALWAYS_USE_PERSISTENT_CLOCK config,
> which enables some minor compile time optimization to avoid
> uncessary code in mostly the suspend/resume path could cause
> problems for userland.
> 
> In particular, the dependency for RTC_HCTOSYS on
> !ALWAYS_USE_PERSISTENT_CLOCK, which avoids setting the time
> twice and simplifies suspend/resume, has the side effect
> of causing the /sys/class/rtc/rtcN/hctosys flag to always be
> zero, and this flag is commonly used by udev to setup the
> /dev/rtc symlink to /dev/rtcN, which can cause pain for
> older applications.
> 
> While the udev rules could use some work to be less fragile,
> breaking userland should strongly be avoided. Additionally
> the compile time optimizations are fairly minor, and the code
> being optimized is likely to be reworked in the future, so
> lets revert this change.
> 
> I suspect this will miss 3.9-final, so marking it for 3.9-stable.

thanks

Acked-by: Feng Tang <feng.tang@...el.com>

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