[PATCH 1/5] mm/sparse: add common helper to mark all memblocks present

Logan Gunthorpe logang at deltatee.com
Fri Oct 5 09:16:38 PDT 2018

Presently the arches arm64, arm, sh have a function which loops through
each memblock and calls memory present. riscv will require a similar

Introduce a common memblocks_present() function that can be used by
all the arches. Subsequent patches will cleanup the arches that
make use of this.

Signed-off-by: Logan Gunthorpe <logang at deltatee.com>
Cc: Andrew Morton <akpm at linux-foundation.org>
Cc: Michal Hocko <mhocko at suse.com>
Cc: Vlastimil Babka <vbabka at suse.cz>
Cc: Pavel Tatashin <pasha.tatashin at oracle.com>
Cc: Oscar Salvador <osalvador at suse.de>
 include/linux/mmzone.h |  6 ++++++
 mm/sparse.c            | 15 +++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 1e22d96734e0..a10fc3c18b07 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -794,6 +794,12 @@ void memory_present(int nid, unsigned long start, unsigned long end);
 static inline void memory_present(int nid, unsigned long start, unsigned long end) {}
+void memblocks_present(void);
+static inline void memblocks_present(void) {}
 int local_memory_node(int node_id);
diff --git a/mm/sparse.c b/mm/sparse.c
index 10b07eea9a6e..109159574208 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -5,6 +5,7 @@
 #include <linux/mm.h>
 #include <linux/slab.h>
 #include <linux/mmzone.h>
+#include <linux/memblock.h>
 #include <linux/bootmem.h>
 #include <linux/compiler.h>
 #include <linux/highmem.h>
@@ -238,6 +239,20 @@ void __init memory_present(int nid, unsigned long start, unsigned long end)
+void __init memblocks_present(void)
+	struct memblock_region *reg;
+	for_each_memblock(memory, reg) {
+		int nid = memblock_get_region_node(reg);
+		memory_present(nid, memblock_region_memory_base_pfn(reg),
+			       memblock_region_memory_end_pfn(reg));
+	}
  * Subtle, we encode the real pfn into the mem_map such that
  * the identity pfn - section_mem_map will return the actual

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