From: Yasunori Goto <y-goto@jp.fujitsu.com>

This is tiny update for Mel-san's comment about
memory hotplug with sparse-vmemmap.

  - Add __meminit to sparse_mem_map_populate()
  - Add a comment.

Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Cc: Andy Whitcroft <apw@shadowen.org>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/sparse-vmemmap.c |    2 +-
 mm/sparse.c         |    1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff -puN mm/sparse-vmemmap.c~memory-hotplug-hot-add-with-sparsemem-vmemmap-update mm/sparse-vmemmap.c
--- a/mm/sparse-vmemmap.c~memory-hotplug-hot-add-with-sparsemem-vmemmap-update
+++ a/mm/sparse-vmemmap.c
@@ -137,7 +137,7 @@ int __meminit vmemmap_populate_basepages
 	return 0;
 }
 
-struct page *sparse_mem_map_populate(unsigned long pnum, int nid)
+struct page * __meminit sparse_mem_map_populate(unsigned long pnum, int nid)
 {
 	struct page *map = pfn_to_page(pnum * PAGES_PER_SECTION);
 	int error = vmemmap_populate(map, PAGES_PER_SECTION, nid);
diff -puN mm/sparse.c~memory-hotplug-hot-add-with-sparsemem-vmemmap-update mm/sparse.c
--- a/mm/sparse.c~memory-hotplug-hot-add-with-sparsemem-vmemmap-update
+++ a/mm/sparse.c
@@ -326,6 +326,7 @@ void __init sparse_init(void)
 static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid,
 						 unsigned long nr_pages)
 {
+	/* This will make the necessary allocations eventually. */
 	return sparse_mem_map_populate(pnum, nid);
 }
 static void __kfree_section_memmap(struct page *memmap, unsigned long nr_pages)
_