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

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Date:	Thu, 16 May 2013 00:52:03 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Kevin Hilman <khilman@...aro.org>
Cc:	Gleb Natapov <gleb@...hat.com>,
	Scott Wood <scottwood@...escale.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 Mon, Mar 25, 2013 at 02:14:20PM -0700, Kevin Hilman wrote:
> Gleb Natapov <gleb@...hat.com> writes:
> 
> > On Sun, Mar 24, 2013 at 02:44:26PM +0100, Frederic Weisbecker wrote:
> >> 2013/3/21 Gleb Natapov <gleb@...hat.com>:
> >> > Isn't is simpler for kernel/context_tracking.c to define empty
> >> > __guest_enter()/__guest_exit() if !CONFIG_KVM.
> >> 
> >> That doesn't look right. Off-cases are usually handled from the
> >> headers, right? So that we avoid iffdeffery ugliness in core code.
> > Lets put it in linux/context_tracking.h header then.
> 
> Here's a version to do that.
> 
> Kevin
> 
> From d9d909394479dd7ff90b7bddb95a564945406719 Mon Sep 17 00:00:00 2001
> From: Kevin Hilman <khilman@...aro.org>
> Date: Mon, 25 Mar 2013 14:12:41 -0700
> Subject: [PATCH v2] ontext_tracking: fix !CONFIG_KVM compile: add stub guest
>  enter/exit

Sorry for my very delayed response...

> 
> When KVM is not enabled, or not available on a platform, the KVM
> headers should not be included.  Instead, just define stub
> __guest_[enter|exit] functions.

May be it would be cleaner to move guest_enter/exit definitions altogether
in linux/context_tracking.h

After all that's where the implementation mostly belong to.

Let me see if I can get that in shape.

Thanks.
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