linux-kernel - Re: [PATCH v4 12/24] xen/arm: introduce CONFIG

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Message-ID: <20120917140232.GA11996@phenom.dumpdata.com>
Date:	Mon, 17 Sep 2012 10:02:32 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Sergei Shtylyov <sshtylyov@...sta.com>
Cc:	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	"arnd@...db.de" <arnd@...db.de>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linaro-dev@...ts.linaro.org" <linaro-dev@...ts.linaro.org>,
	Ian Campbell <Ian.Campbell@...rix.com>,
	"catalin.marinas@....com" <catalin.marinas@....com>,
	"Tim (Xen.org)" <tim@....org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4 12/24] xen/arm: introduce CONFIG_XEN on ARM

On Mon, Sep 17, 2012 at 04:07:37PM +0400, Sergei Shtylyov wrote:
> Hello.
> 
> On 17-09-2012 14:57, Stefano Stabellini wrote:
> 
> >>>Changes in v2:
> 
> >>>- mark Xen guest support on ARM as EXPERIMENTAL.
> 
> >>>Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
> >>>Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> >>>---
> >>>  arch/arm/Kconfig |   10 ++++++++++
> >>>  1 files changed, 10 insertions(+), 0 deletions(-)
> 
> >>>diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> >>>index 2f88d8d..e92518d 100644
> >>>--- a/arch/arm/Kconfig
> >>>+++ b/arch/arm/Kconfig
> >>>@@ -1897,6 +1897,16 @@ config DEPRECATED_PARAM_STRUCT
> >>>  	  This was deprecated in 2001 and announced to live on for 5 years.
> >>>  	  Some old boot loaders still use this way.
> >>>
> >>>+config XEN_DOM0
> >>>+	def_bool y
> >>>+
> >>>+config XEN
> >>>+	bool "Xen guest support on ARM (EXPERIMENTAL)"
> >>>+	depends on EXPERIMENTAL && ARM && OF

I think the CONFIG_EXPERIMENTAL is going away. Or it has already
gone away?

> >>>+	select XEN_DOM0
> 
> >>    What's the point of selecting it if it's always "y"?
> 
> >That's because on X86 is not always "y": there are things under
> >drivers/xen that compile on both platforms and depend on XEN_DOM0.
> 
>    But we're not on x86. On ARM this select is pointless.

Sure, but parts of the generic Xen (drivers/xen) code functionality has checks
for that (CONFIG_DOM0) to use some functionality that is not neccessarily
considered "dom0" specific for ARM.

The right way is to seperate those to be more of a 'backend' config and
'frontend' config. But those CONFIG options are a maze and I figured I
will fix this Gordon knot once this is all accepted/compiled/works, and then
slowly untangle the CONFIG-mess.

> 
> WBR, Sergei
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