linux-kernel - Re: [PATCH] fix RTC_CLASS regression with PARISC

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Message-Id: <20080910140417.bc35c199.akpm@linux-foundation.org>
Date:	Wed, 10 Sep 2008 14:04:17 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	David Miller <davem@...emloft.net>
Cc:	david-b@...bell.net, James.Bottomley@...senpartnership.com,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-parisc@...r.kernel.org, alessandro.zummo@...ertech.it,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] fix RTC_CLASS regression with PARISC

On Mon, 08 Sep 2008 19:52:35 -0700 (PDT)
David Miller <davem@...emloft.net> wrote:

> From: David Brownell <david-b@...bell.net>
> Date: Mon, 8 Sep 2008 17:55:25 -0700
> 
> > On Monday 08 September 2008, David Miller wrote:
> > > From: David Brownell <david-b@...bell.net>
> > > Date: Mon, 8 Sep 2008 16:29:20 -0700
> > > 
> > > > That said, there's a bit of unresolved stuff around NTP hooks
> > > > in the kernel.  Some patches are pending to let thtem work with
> > > > the RTC framework -- where writing an RTC may need to sleep,
> > > > for example because the RTC is on an I2C or SPI bus.  And
> > > > then there's the discussion of whether that shouldn't all be
> > > > handled by NTPD anyway, no special kernel support desired.
> > > > Alessandro has opinions there.  ;)
> > > 
> > > My update_persistent_clock() on sparc64 is:
> > > 
> > > int update_persistent_clock(struct timespec now)
> > > {
> > > 	struct rtc_device *rtc = rtc_class_open("rtc0");
> > 
> > I'd be tempted to cache that ... notice how you never
> > close it, too.  That will goof lots of refcounts...
> 
> Well if I cache it then we'll hold it forever and that's not
> so nice right?
> 
> I'm going to put the missing rtc_close() in there for now to
> fix the leak.
> 
> I'm happy to cache this if you think it's warranted, but then
> this is like saying that the refcount doesn't matter :-)
> 
> > =============== CUT ON THE DOTTED LINE ==================
> > Subject: ntp: let update_persistent_clock() sleep
> > From: "Maciej W. Rozycki" <macro@...ux-mips.org>
> 
> I see, as Paul mentioned this is needed for stuff like RTCs
> behind I2C.
> 
> This change isn't in Linus's tree yet.

Should it be?

Its current status is: stuck in -mm.  I've sent it to Thomas a couple
of times marked "for 2.6.27?" and he might have applied it now (I'm a
few days behind, waiting for linux-next to start up again).

It was not included in Thomas's recent mainline pull request:

From: Thomas Gleixner <tglx@...x.de>
Subject: [GIT pull] timer updates for 2.6.27
Date: Tue, 9 Sep 2008 22:32:39 +0200 (CEST)


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