linux-kernel - Re: [PATCH] KVM: allow host header to be included even for !CONFIG

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Date:	Thu, 21 Mar 2013 09:29:55 +0200
From:	Gleb Natapov <gleb@...hat.com>
To:	Scott Wood <scottwood@...escale.com>
Cc:	Kevin Hilman <khilman@...aro.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linaro-kernel@...ts.linaro.org,
	Marcelo Tosatti <mtosatti@...hat.com>,
	"open list:KERNEL VIRTUAL MA..." <kvm@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] KVM: allow host header to be included even for
 !CONFIG_KVM

On Wed, Mar 20, 2013 at 06:58:41PM -0500, Scott Wood wrote:
> On 03/14/2013 07:13:46 PM, Kevin Hilman wrote:
> >The new context tracking subsystem unconditionally includes kvm_host.h
> >headers for the guest enter/exit macros.  This causes a compile
> >failure when KVM is not enabled.
> >
> >Fix by adding an IS_ENABLED(CONFIG_KVM) check to kvm_host so it can
> >be included/compiled even when KVM is not enabled.
> >
> >Cc: Frederic Weisbecker <fweisbec@...il.com>
> >Signed-off-by: Kevin Hilman <khilman@...aro.org>
> >---
> >Applies on v3.9-rc2
> >
> > include/linux/kvm_host.h | 7 ++++++-
> > 1 file changed, 6 insertions(+), 1 deletion(-)
> 
> This broke the PPC non-KVM build, which was relying on stub
> functions in kvm_ppc.h, which relies on "struct vcpu" in kvm_host.h.
> 
> Why can't the entirety kvm_host.h be included regardless of
> CONFIG_KVM, just like most other feature-specific headers?  Why
> can't the if/else just go around the functions that you want to stub
> out for non-KVM builds?
> 
Kevin,

 What compilation failure this patch fixes? I presume something ARM
related.

--
			Gleb.
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