[PATCH] mm: sparse: Skip no-map regions in memblocks_present

[KarimAllah Ahmed]

Do not mark regions that are marked with nomap to be present, otherwise
these memblock cause unnecessarily allocation of metadata.

Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Cc: Baoquan He <bhe@xxxxxxxxxx>
Cc: Qian Cai <cai@xxxxxx>
Cc: Wei Yang <richard.weiyang@xxxxxxxxx>
Cc: Logan Gunthorpe <logang@xxxxxxxxxxxx>
Cc: linux-mm@xxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: KarimAllah Ahmed <karahmed@xxxxxxxxx>
---
 mm/sparse.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mm/sparse.c b/mm/sparse.c
index fd13166..33810b6 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -256,6 +256,10 @@ void __init memblocks_present(void)
 	struct memblock_region *reg;
 
 	for_each_memblock(memory, reg) {
+
+		if (memblock_is_nomap(reg))
+			continue;
+
 		memory_present(memblock_get_region_node(reg),
 			       memblock_region_memory_base_pfn(reg),
 			       memblock_region_memory_end_pfn(reg));
-- 
2.7.4