section_to_node_table[] is used to record section's node id, which is used in page_to_nid(). While for hot-add memory, this is missed. BTW, current online_pages works because it leverages nid in memory_block. But the granularity of node id should be mem_section wide. Signed-off-by: Wei Yang <richardw.yang@xxxxxxxxxxxxxxx> --- mm/sparse.c | 1 + 1 file changed, 1 insertion(+) diff --git a/mm/sparse.c b/mm/sparse.c index fd13166949b5..3ba8f843cb7a 100644 --- a/mm/sparse.c +++ b/mm/sparse.c @@ -735,6 +735,7 @@ int __meminit sparse_add_one_section(int nid, unsigned long start_pfn, */ page_init_poison(memmap, sizeof(struct page) * PAGES_PER_SECTION); + set_section_nid(section_nr, nid); section_mark_present(ms); sparse_init_one_section(ms, section_nr, memmap, usemap); -- 2.19.1
