mm/page_ref: introduce page_ref_inc_return

Let's introduce that helper.

Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/include/linux/page_ref.h b/include/linux/page_ref.h
index 8b5e0a9f2431..610e13271918 100644
--- a/include/linux/page_ref.h
+++ b/include/linux/page_ref.h
@@ -124,6 +124,15 @@ static inline int page_ref_sub_and_test(struct page *page, int nr)
         return ret;
 }
 
+static inline int page_ref_inc_return(struct page *page)
+{
+        int ret = atomic_inc_return(&page->_refcount);
+
+        if (page_ref_tracepoint_active(__tracepoint_page_ref_mod_and_return))
+                __page_ref_mod_and_return(page, 1, ret);
+        return ret;
+}
+
 static inline int page_ref_dec_and_test(struct page *page)
 {
         int ret = atomic_dec_and_test(&page->_refcount);