---

yaml
---
r: 273227
b: refs/heads/master
c: e0d85a3
h: refs/heads/master
i:
  273225: d0112ad
  273223: c8c663e
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 0693bc9ce2cc4f6a1b9c3c05790fc149a74c0b87
+refs/heads/master: e0d85a366c2300efd230ef82a9b22110b0658331

trunk/arch/sparc/mm/gup.c

@@ -12,6 +12,17 @@
 #include <linux/rwsem.h>
 #include <asm/pgtable.h>
 
+static inline void get_huge_page_tail(struct page *page)
+{
+	/*
+	 * __split_huge_page_refcount() cannot run
+	 * from under us.
+	 */
+	VM_BUG_ON(page_mapcount(page) < 0);
+	VM_BUG_ON(atomic_read(&page->_count) != 0);
+	atomic_inc(&page->_mapcount);
+}
+
 /*
  * The performance critical leaf functions are made noinline otherwise gcc
  * inlines everything into a single function which results in too much
@@ -56,6 +67,8 @@ static noinline int gup_pte_range(pmd_t pmd, unsigned long addr,
 			put_page(head);
 			return 0;
 		}
+		if (head != page)
+			get_huge_page_tail(page);
 
 		pages[*nr] = page;
 		(*nr)++;