[PATCH v2 1/3] mm/sparse: Add a static variable nr_present_sections

[Baoquan He]

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 <b...@redhat.com>
---
 mm/sparse.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/sparse.c b/mm/sparse.c
index 7af5e7a92528..433d3c9b4b56 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -202,6 +202,7 @@ static inline int next_present_section_nr(int section_nr)
              (section_nr <= __highest_present_section_nr));    \
             section_nr = next_present_section_nr(section_nr))
 
+static int nr_present_sections;
 /* Record a memory area against a node. */
 void __init memory_present(int nid, unsigned long start, unsigned long end)
 {
@@ -231,6 +232,7 @@ 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