[11/45] KVM: PPC: e500mc: Add build-time assert that vcpu is at offset 0
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Message ID 20191022015925.31916-12-sean.j.christopherson@intel.com
State New
Headers show
Series
  • KVM: Refactor vCPU creation
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Commit Message

Sean Christopherson Oct. 22, 2019, 1:58 a.m. UTC
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 <sean.j.christopherson@intel.com>
---
 arch/powerpc/kvm/e500mc.c | 2 ++
 1 file changed, 2 insertions(+)

Patch
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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;