[PATCH 2/3] mm/sparse: expand the CONFIG_SPARSEMEM_EXTREME range in __nr_to_section()

[Wei Yang <richard.weiyang@gmail.com>]

When CONFIG_SPARSEMEM_EXTREME is not defined, mem_section is a static
two dimension array. This means !mem_section[SECTION_NR_TO_ROOT(nr)] is
always true.

This patch expand the CONFIG_SPARSEMEM_EXTREME range to return a proper
mem_section when CONFIG_SPARSEMEM_EXTREME is not defined.

Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
---
 include/linux/mmzone.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 32699b2dc52a..33086f86d1a7 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -1155,9 +1155,9 @@ static inline struct mem_section *__nr_to_section(unsigned long nr)
 #ifdef CONFIG_SPARSEMEM_EXTREME
 	if (!mem_section)
 		return NULL;
-#endif
 	if (!mem_section[SECTION_NR_TO_ROOT(nr)])
 		return NULL;
+#endif
 	return &mem_section[SECTION_NR_TO_ROOT(nr)][nr & SECTION_ROOT_MASK];
 }
 extern int __section_nr(struct mem_section* ms);
-- 
2.15.1