diff --git a/mm/Kconfig b/mm/Kconfig
index 446c658..0bd9c2d 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -77,9 +77,6 @@
 	def_bool y
 	depends on !SPARSEMEM
 
-config HAVE_GET_USER_PAGES_FAST
-	bool
-
 #
 # Both the NUMA code and DISCONTIGMEM use arrays of pg_data_t's
 # to represent different areas of memory.  This variable allows
diff --git a/mm/util.c b/mm/util.c
index 9341ca7..cb00b74 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -171,3 +171,18 @@
 	mm->unmap_area = arch_unmap_area;
 }
 #endif
+
+int __attribute__((weak)) get_user_pages_fast(unsigned long start,
+				int nr_pages, int write, struct page **pages)
+{
+	struct mm_struct *mm = current->mm;
+	int ret;
+
+	down_read(&mm->mmap_sem);
+	ret = get_user_pages(current, mm, start, nr_pages,
+					write, 0, pages, NULL);
+	up_read(&mm->mmap_sem);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(get_user_pages_fast);