Subject: [PATCH 11/45] KVM: PPC: e500mc: Add build-time assert that vcpu is at offset 0

From: Sean Christopherson <[email-masked]>
Date: Mon, 21 Oct 2019 18:58:51 -0700

In preparation for moving vcpu allocation to common PPC code, add an
explicit, albeit redundant, build-time assert to ensure the vcpu member
is located at offset 0.  The assert is redundant in the sense that
kvmppc_core_vcpu_create_e500() contains a functionally identical assert.
The motiviation for adding the extra assert is to provide visual
confirmation of the correctness of moving vcpu allocation to common
code.

Signed-off-by: Sean Christopherson <[email-masked]>
---
 arch/powerpc/kvm/e500mc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/powerpc/kvm/e500mc.c b/arch/powerpc/kvm/e500mc.c
index 318e65c65999..c51f4bb086fd 100644
--- a/arch/powerpc/kvm/e500mc.c
+++ b/arch/powerpc/kvm/e500mc.c
@@ -308,6 +308,8 @@ static struct kvm_vcpu *kvmppc_core_vcpu_create_e500mc(struct kvm *kvm,
 	struct kvm_vcpu *vcpu;
 	int err;
 
+	BUILD_BUG_ON(offsetof(struct kvmppc_vcpu_e500, vcpu) != 0);
+
 	vcpu_e500 = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 	if (!vcpu_e500) {
 		err = -ENOMEM;
-- 
2.22.0

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