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

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Message-Id: <1363306426-27209-1-git-send-email-khilman@linaro.org>
Date:	Thu, 14 Mar 2013 17:13:46 -0700
From:	Kevin Hilman <khilman@...aro.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	linaro-kernel@...ts.linaro.org,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Gleb Natapov <gleb@...hat.com>,
	kvm@...r.kernel.org (open list:KERNEL VIRTUAL MA...),
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] KVM: allow host header to be included even for !CONFIG_KVM

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(-)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index cad77fe..a942863 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1,6 +1,8 @@
 #ifndef __KVM_HOST_H
 #define __KVM_HOST_H
 
+#if IS_ENABLED(CONFIG_KVM)
+
 /*
  * This work is licensed under the terms of the GNU GPL, version 2.  See
  * the COPYING file in the top-level directory.
@@ -1055,5 +1057,8 @@ static inline bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu)
 }
 
 #endif /* CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT */
+#else
+static inline void __guest_enter(void) { return; }
+static inline void __guest_exit(void) { return; }
+#endif /* IS_ENABLED(CONFIG_KVM) */
 #endif
-
-- 
1.8.1.2

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