Re: [PATCH] KVM: allow host header to be included even for!CONFIG_KVM

From: Scott Wood
Date: Wed Mar 20 2013 - 19:58:51 EST

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@xxxxxxxxx>
Signed-off-by: Kevin Hilman <khilman@xxxxxxxxxx>
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?

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