linux-kernel - Re: [PATCH v3] xen/arm: enable PV control for ARM

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Date:	Mon, 22 Jul 2013 15:09:35 +0100
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Mark Rutland <mark.rutland@....com>
CC:	Julien Grall <julien.grall@...aro.org>,
	"stefano.stabellini@...citrix.com" <stefano.stabellini@...citrix.com>,
	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
	"ian.campbell@...rix.com" <ian.campbell@...rix.com>,
	"patches@...aro.org" <patches@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xen.org" <xen-devel@...ts.xen.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>, <catalin.marinas@....com>
Subject: Re: [PATCH v3] xen/arm: enable PV control for ARM

On Mon, 22 Jul 2013, Mark Rutland wrote:
> Hi,
> 
> [Adding Catalin to Cc]
> 
> On Mon, Jul 22, 2013 at 11:57:34AM +0100, Julien Grall wrote:
> > Enable power management from the toolstack for ARM guest.
> > 
> > Signed-off-by: Julien Grall <julien.grall@...aro.org>
> > 
> > ---
> >     Changes in v3:
> >         - Fix condition to compile cpu_hotplug.o
> >     Changes in v2:
> >         - Don't compile xen/cpu_hotplug.o with ARM64
> 
> My arm64 cpu hotplug series is going to be dependent on not compiling
> xen/cpu_hotplug.o. Currently I'm not able to compile an arm64 kernel
> with my patches and Xen support.
> 
> How do you intend to push this? I'd like to ensure my cpu hotplug series
> is able to go in for the next merge window.

This patch does exactly that: it makes sure cpu_hotplug is not compiled
on ARM64.
Given that this patch is for drivers/xen/Makefile, normally it goes via
Konrad's tree.


> > ---
> >  drivers/xen/Makefile |    5 ++---
> >  1 file changed, 2 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/xen/Makefile b/drivers/xen/Makefile
> > index 2bf461a..f185e8d 100644
> > --- a/drivers/xen/Makefile
> > +++ b/drivers/xen/Makefile
> > @@ -1,9 +1,8 @@
> > -ifneq ($(CONFIG_ARM),y)
> > -obj-y	+= manage.o
> > +ifeq ($(filter y, $(CONFIG_ARM) $(CONFIG_ARM64)),)
> >  obj-$(CONFIG_HOTPLUG_CPU)		+= cpu_hotplug.o
> >  endif
> 
> Might it make sense to enable this based on a list the architectures
> that actually need this, rather than disabling it based on the list of
> architectures that don't?

This is more philosophical than practical, but I would expect this
limitation to go away soon, and be able to compile cpu_hotplug without
issues on ARM and ARM64 too.
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