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 | 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
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