diff options
Diffstat (limited to 'include/linux/mmzone.h')
| -rw-r--r-- | include/linux/mmzone.h | 40 |
1 files changed, 15 insertions, 25 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index b97054bbc394..79cf578e21b9 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -487,39 +487,29 @@ struct mem_section { unsigned long section_mem_map; }; -#ifdef CONFIG_ARCH_SPARSEMEM_EXTREME -/* - * Should we ever require GCC 4 or later then the flat array scheme - * can be eliminated and a uniform solution for EXTREME and !EXTREME can - * be arrived at. - */ -#define SECTION_ROOT_SHIFT (PAGE_SHIFT-3) -#define SECTION_ROOT_MASK ((1UL<<SECTION_ROOT_SHIFT) - 1) -#define SECTION_TO_ROOT(_sec) ((_sec) >> SECTION_ROOT_SHIFT) -#define NR_SECTION_ROOTS (NR_MEM_SECTIONS >> SECTION_ROOT_SHIFT) +#ifdef CONFIG_SPARSEMEM_EXTREME +#define SECTIONS_PER_ROOT (PAGE_SIZE / sizeof (struct mem_section)) +#else +#define SECTIONS_PER_ROOT 1 +#endif -extern struct mem_section *mem_section[NR_SECTION_ROOTS]; - -static inline struct mem_section *__nr_to_section(unsigned long nr) -{ - if (!mem_section[SECTION_TO_ROOT(nr)]) - return NULL; - return &mem_section[SECTION_TO_ROOT(nr)][nr & SECTION_ROOT_MASK]; -} +#define SECTION_NR_TO_ROOT(sec) ((sec) / SECTIONS_PER_ROOT) +#define NR_SECTION_ROOTS (NR_MEM_SECTIONS / SECTIONS_PER_ROOT) +#define SECTION_ROOT_MASK (SECTIONS_PER_ROOT - 1) +#ifdef CONFIG_SPARSEMEM_EXTREME +extern struct mem_section *mem_section[NR_SECTION_ROOTS]; #else - -extern struct mem_section mem_section[NR_MEM_SECTIONS]; +extern struct mem_section mem_section[NR_SECTION_ROOTS][SECTIONS_PER_ROOT]; +#endif static inline struct mem_section *__nr_to_section(unsigned long nr) { - return &mem_section[nr]; + if (!mem_section[SECTION_NR_TO_ROOT(nr)]) + return NULL; + return &mem_section[SECTION_NR_TO_ROOT(nr)][nr & SECTION_ROOT_MASK]; } -#define sparse_index_init(_sec, _nid) do {} while (0) - -#endif - /* * We use the lower bits of the mem_map pointer to store * a little bit of information. There should be at least |