[PATCH v3 1/4] mm/sparse: Add a static variable nr_present_sections

From: Baoquan He
Date: Tue Feb 27 2018 - 22:27:19 EST


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 7af5e7a92528..3400c1c02f7a 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