linux-kernel - Re: [patch 0/4] XEN: Interrupt cleanups

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Date:	Tue, 8 Feb 2011 15:05:06 +0000
From:	Ian Campbell <Ian.Campbell@...citrix.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	Jeremy Fitzhardinge <jeremy@...p.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: Re: [patch 0/4] XEN: Interrupt cleanups

On Tue, 2011-02-08 at 14:55 +0000, Thomas Gleixner wrote:
> On Tue, 8 Feb 2011, Ian Campbell wrote:
> > On Mon, 2011-02-07 at 13:57 -0800, Jeremy Fitzhardinge wrote:
> > > On 02/07/2011 01:33 PM, Thomas Gleixner wrote:
> > > > Ok. The irq_chip conversion is mostly mechanical, but I'm really
> > > > concerned about that IRQ_SUSPENDED hackery. It'd be nice if you
> > > > resp. Ian could give that a test ride. That would allow me to cleanup
> > > > stuff in the core code.
> > > 
> > > Ian notes: "tglx's 4 patch interrupt cleanup series on LKML causes some
> > > oddities on PV migration. Will dig further tomorrow..."
> > > 
> > > So it looks like there's still something amiss.
> > 
> > The patches missed an indirect use of IRQF_NO_SUSPEND pulled in via
> > IRQF_TIMER. The following fixed things for me (probably belongs in your
> > patch 4/4).
> > 
> > With this fixlet PV guest migration works just fine. I also booted the
> > entire series as a dom0 kernel and it appeared fine.
> > 
> > I also tested alongside the cleanup patches Jeremy mentioned before and
> > as expected there is no interaction.
> > 
> > So, with the fixes to 2/4 (irq_move_irq think from yesterday) and 4/4
> > (below), the entire series is:
> > Acked-by: Ian Campbell <ian.campbell@...rix.com>
> 
> Cool. So what's the best way to proceed ? That code is not yet in
> linus tree, right ?

Correct.

> So I guess the best way is that I add the core changes to a rc-4 based
> branch and you can pull it in and apply the whole xen stuff to your
> own tree.

My existing cleanup patches are in Konrad's tree (which is in linux-next
etc) so that probably makes most sense as a home for this series. So
unless Konrad has any objections I think it makes sense to pull your
core changes into that branch and then apply your Xen bits on top.

Konrad's branch with my stuff is:
  git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git stable/irq.rework

Konrad, this thread starts at <20110205200108.921707839@...utronix.de>
== http://thread.gmane.org/gmane.linux.kernel/1096437

> I base my pending patches on top of that so it wont be any problem
> when merging the stuff together in next or linus later.

I don't think there will be much trouble with overlap between these and
any Xen events.c changes for the next merge window but what you suggest
should remove the risk.

Ian.

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