From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Randy.Dunlap" Subject: Re: [PATCH] fix RTC_CLASS regression with PARISC Date: Wed, 10 Sep 2008 14:09:31 -0700 (PDT) Message-ID: References: <200809081629.21125.david-b@pacbell.net> <20080908.164427.216880550.davem@davemloft.net> <200809081755.26148.david-b@pacbell.net> <20080908.195235.200905674.davem@davemloft.net> <20080910140417.bc35c199.akpm@linux-foundation.org> Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Cc: David Miller , david-b@pacbell.net, James.Bottomley@hansenpartnership.com, torvalds@linux-foundation.org, linux-kernel@vger.kernel.org, linux-parisc@vger.kernel.org, alessandro.zummo@towertech.it, Thomas Gleixner To: Andrew Morton Return-path: In-Reply-To: <20080910140417.bc35c199.akpm@linux-foundation.org> List-ID: List-Id: linux-parisc.vger.kernel.org On Wed, 10 Sep 2008, Andrew Morton wrote: > On Mon, 08 Sep 2008 19:52:35 -0700 (PDT) > David Miller wrote: > > > From: David Brownell > > Date: Mon, 8 Sep 2008 17:55:25 -0700 > > > > > On Monday 08 September 2008, David Miller wrote: > > > > From: David Brownell > > > > 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" > > > > 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). This is something that you can attempt (again) to address next week along with other process issues... Maybe travel time/delay is also involved (for people other than Mr. Rothwell). > It was not included in Thomas's recent mainline pull request: > > From: Thomas Gleixner > Subject: [GIT pull] timer updates for 2.6.27 > Date: Tue, 9 Sep 2008 22:32:39 +0200 (CEST) -- ~Randy