KVM: set_memory_region: Refactor commit_memory_region()

This patch makes the parameter old a const pointer to the old memory
slot and adds a new parameter named change to know the change being
requested: the former is for removing extra copying and the latter is
for cleaning up the code.

Signed-off-by: Takuya Yoshikawa <yoshikawa_takuya_b1@lab.ntt.co.jp>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 80dcc53a1aba..1e521baf9a7d 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -1639,12 +1639,12 @@ int kvmppc_core_prepare_memory_region(struct kvm *kvm,
 
 void kvmppc_core_commit_memory_region(struct kvm *kvm,
                                       struct kvm_userspace_memory_region *mem,
-                                      struct kvm_memory_slot old)
+                                      const struct kvm_memory_slot *old)
 {
         unsigned long npages = mem->memory_size >> PAGE_SHIFT;
         struct kvm_memory_slot *memslot;
 
-        if (npages && old.npages) {
+        if (npages && old->npages) {
                 /*
                  * If modifying a memslot, reset all the rmap dirty bits.
                  * If this is a new memslot, we don't need to do anything