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@xxxxxxxxx> --- 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
