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

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Date:	Mon, 25 Mar 2013 14:14:20 -0700
From:	Kevin Hilman <khilman@...aro.org>
To:	Gleb Natapov <gleb@...hat.com>
Cc:	Frederic Weisbecker <fweisbec@...il.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

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

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.

Cc: Frederic Weisbecker <fweisbec@...il.com>
Signed-off-by: Kevin Hilman <khilman@...aro.org>
---
 include/linux/context_tracking.h | 7 +++++++
 kernel/context_tracking.c        | 1 -
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/include/linux/context_tracking.h b/include/linux/context_tracking.h
index 365f4a6..9d0f242 100644
--- a/include/linux/context_tracking.h
+++ b/include/linux/context_tracking.h
@@ -3,6 +3,13 @@
 
 #include <linux/sched.h>
 #include <linux/percpu.h>
+#if IS_ENABLED(CONFIG_KVM)
+#include <linux/kvm_host.h>
+#else
+#define __guest_enter()
+#define __guest_exit()
+#endif
+
 #include <asm/ptrace.h>
 
 struct context_tracking {
diff --git a/kernel/context_tracking.c b/kernel/context_tracking.c
index 65349f0..85bdde1 100644
--- a/kernel/context_tracking.c
+++ b/kernel/context_tracking.c
@@ -15,7 +15,6 @@
  */
 
 #include <linux/context_tracking.h>
-#include <linux/kvm_host.h>
 #include <linux/rcupdate.h>
 #include <linux/sched.h>
 #include <linux/hardirq.h>
-- 
1.8.2

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