[v2,2/2] mm/sparse: add common helper to mark all memblocks present
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Message ID 20181107205433.3875-3-logang@deltatee.com
State In Next
Commit 9def36e0fa9a0d9c5393c039db59f1f2d3a388b3
Headers show
  • Introduce common code for risc-v sparsemem support
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Commit Message

Logan Gunthorpe Nov. 7, 2018, 8:54 p.m. UTC
Presently the arches arm64, arm and 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@deltatee.com>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Oscar Salvador <osalvador@suse.de>
 include/linux/mmzone.h |  6 ++++++
 mm/sparse.c            | 16 ++++++++++++++++
 2 files changed, 22 insertions(+)

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diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 847705a6d0ec..db023a92f3a4 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -783,6 +783,12 @@  void memory_present(int nid, unsigned long start, unsigned long end);
 static inline void memory_present(int nid, unsigned long start, unsigned long end) {}
+#if defined(CONFIG_SPARSEMEM)
+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 33307fc05c4d..3abc8cc50201 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -239,6 +239,22 @@  void __init memory_present(int nid, unsigned long start, unsigned long end)
+ * Mark all memblocks as present using memory_present(). This is a
+ * convienence function that is useful for a number of arches
+ * to mark all of the systems memory as present during initialization.
+ */
+void __init memblocks_present(void)
+	struct memblock_region *reg;
+	for_each_memblock(memory, reg) {
+		memory_present(memblock_get_region_node(reg),
+			       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