linux-kernel - Re: [RFC][PATCH 0/14] Convert remaining arches to read/update_persistent

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Message-ID: <20091224051021.GA28878@linux-sh.org>
Date:	Thu, 24 Dec 2009 14:10:21 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	David Miller <davem@...emloft.net>
Cc:	johnstul@...ibm.com, linux-kernel@...r.kernel.org, rth@...ddle.net,
	linux-alpha@...r.kernel.org, linux-sh@...r.kernel.org,
	linux@....linux.org.uk, hskinnemoen@...el.com, vapier@...too.org,
	starvik@...s.com, dhowells@...hat.com, ysato@...rs.sourceforge.jp,
	tony.luck@...el.com, takata@...ux-m32r.org, geert@...ux-m68k.org,
	yasutake.koichi@...panasonic.com, kyle@...artin.ca
Subject: Re: [RFC][PATCH 0/14] Convert remaining arches to read/update_persistent_clock

On Wed, Dec 23, 2009 at 08:54:15PM -0800, David Miller wrote:
> From: Paul Mundt <lethal@...ux-sh.org>
> Date: Wed, 23 Dec 2009 14:08:10 +0900
> 
> > In any event, I wonder if it might make more sense to take something like
> > the SPARC implementation that is simply a wrapper around the RTC, move
> > that out in to a more generic place, and permit architectures to select
> > an RTC class backed persistent clock instead (it seems to be only
> > platforms that haven't caught up yet in terms of generic time and RTC
> > migration that would want to define this interface on their own at all at
> > this point)?
> 
> This sounds nice but don't we have a slew of RTC types that need
> to be accessed over I2C and thus you can't touch them without
> sleeping?

Yes, and SPI and so on. We do however have plenty of available room for
adding a valid-for-persistent-clock flag to permit drivers to opt-in, so
we can certainly still do better than the status quo. I'll hack something
up and see how it goes.
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