diff options
Diffstat (limited to 'mm/sparse.c')
| -rw-r--r-- | mm/sparse.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/mm/sparse.c b/mm/sparse.c index b3c82ba30012..158d6a2a5263 100644 --- a/mm/sparse.c +++ b/mm/sparse.c @@ -24,6 +24,25 @@ struct mem_section mem_section[NR_SECTION_ROOTS][SECTIONS_PER_ROOT] #endif EXPORT_SYMBOL(mem_section); +#ifdef NODE_NOT_IN_PAGE_FLAGS +/* + * If we did not store the node number in the page then we have to + * do a lookup in the section_to_node_table in order to find which + * node the page belongs to. + */ +#if MAX_NUMNODES <= 256 +static u8 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned; +#else +static u16 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned; +#endif + +unsigned long page_to_nid(struct page *page) +{ + return section_to_node_table[page_to_section(page)]; +} +EXPORT_SYMBOL(page_to_nid); +#endif + #ifdef CONFIG_SPARSEMEM_EXTREME static struct mem_section *sparse_index_alloc(int nid) { @@ -49,6 +68,10 @@ static int sparse_index_init(unsigned long section_nr, int nid) struct mem_section *section; int ret = 0; +#ifdef NODE_NOT_IN_PAGE_FLAGS + section_to_node_table[section_nr] = nid; +#endif + if (mem_section[root]) return -EEXIST; |