KVM: introduce KVM_ERR_PTR_BAD_PAGE

It is used to eliminate the overload of function call and cleanup
the code

Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

3 files changed, 9 insertions, 15 deletions

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index e2dcc7cb2284..ce7c32950f4e 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -68,6 +68,13 @@ static inline int is_invalid_pfn(pfn_t pfn)
         return !is_noslot_pfn(pfn) && is_error_pfn(pfn);
 }
 
+#define KVM_ERR_PTR_BAD_PAGE    (ERR_PTR(-ENOENT))
+
+static inline int is_error_page(struct page *page)
+{
+        return IS_ERR(page);
+}
+
 /*
  * vcpu->requests bit members
  */
@@ -409,7 +416,6 @@ id_to_memslot(struct kvm_memslots *slots, int id)
         return slot;
 }
 
-int is_error_page(struct page *page);
 int kvm_is_error_hva(unsigned long addr);
 int kvm_set_memory_region(struct kvm *kvm,
                           struct kvm_userspace_memory_region *mem,
@@ -436,7 +442,6 @@ void kvm_arch_flush_shadow(struct kvm *kvm);
 int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages,
                             int nr_pages);
 
-struct page *get_bad_page(void);
 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn);
 void kvm_release_page_clean(struct page *page);
diff --git a/virt/kvm/async_pf.c b/virt/kvm/async_pf.c
index 79722782d9d7..56f553391896 100644
--- a/virt/kvm/async_pf.c
+++ b/virt/kvm/async_pf.c
@@ -203,7 +203,7 @@ int kvm_async_pf_wakeup_all(struct kvm_vcpu *vcpu)
         if (!work)
                 return -ENOMEM;
 
-        work->page = get_bad_page();
+        work->page = KVM_ERR_PTR_BAD_PAGE;
         INIT_LIST_HEAD(&work->queue); /* for list_del to work */
 
         spin_lock(&vcpu->async_pf.lock);
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index eb73e5f13678..93d3c6e063c8 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -922,17 +922,6 @@ void kvm_disable_largepages(void)
 }
 EXPORT_SYMBOL_GPL(kvm_disable_largepages);
 
-int is_error_page(struct page *page)
-{
-        return IS_ERR(page);
-}
-EXPORT_SYMBOL_GPL(is_error_page);
-
-struct page *get_bad_page(void)
-{
-        return ERR_PTR(-ENOENT);
-}
-
 static inline unsigned long bad_hva(void)
 {
         return PAGE_OFFSET;
@@ -1179,7 +1168,7 @@ static struct page *kvm_pfn_to_page(pfn_t pfn)
         WARN_ON(kvm_is_mmio_pfn(pfn));
 
         if (is_error_pfn(pfn) || kvm_is_mmio_pfn(pfn))
-                return get_bad_page();
+                return KVM_ERR_PTR_BAD_PAGE;
 
         return pfn_to_page(pfn);
 }