It's used to record how many memory sections are marked as present during system boot up, and will be used in the later patch. Signed-off-by: Baoquan He <bhe@xxxxxxxxxx> --- mm/sparse.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/mm/sparse.c b/mm/sparse.c index 62eef264a7bd..48cf7b7982e2 100644 --- a/mm/sparse.c +++ b/mm/sparse.c @@ -202,6 +202,12 @@ static inline int next_present_section_nr(int section_nr) (section_nr <= __highest_present_section_nr)); \ section_nr = next_present_section_nr(section_nr)) +/* + * Record how many memory sections are marked as present + * during system bootup. + */ +static int __initdata nr_present_sections; + /* Record a memory area against a node. */ void __init memory_present(int nid, unsigned long start, unsigned long end) { @@ -231,6 +237,7 @@ void __init memory_present(int nid, unsigned long start, unsigned long end) ms->section_mem_map = sparse_encode_early_nid(nid) | SECTION_IS_ONLINE; section_mark_present(ms); + nr_present_sections++; } } } -- 2.13.6