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Date:   Tue,  7 May 2019 20:38:04 +0200
From:   David Hildenbrand <>
        Dan Williams <>,
        David Hildenbrand <>
Subject: [PATCH v2 8/8] mm/memory_hotplug: Remove "zone" parameter from sparse_remove_one_section

Unused, and memory unplug path should never care about zones. This is
the job of memory offlining. ZONE_DEVICE might require special care -
the caller of arch_remove_memory() should handle this.

Signed-off-by: David Hildenbrand <>
 include/linux/memory_hotplug.h | 2 +-
 mm/memory_hotplug.c            | 2 +-
 mm/sparse.c                    | 4 ++--
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index 2f1f87e13baa..1a4257c5f74c 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -346,7 +346,7 @@ extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
 extern bool is_memblock_offlined(struct memory_block *mem);
 extern int sparse_add_one_section(int nid, unsigned long start_pfn,
 				  struct vmem_altmap *altmap);
-extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms,
+extern void sparse_remove_one_section(struct mem_section *ms,
 		unsigned long map_offset, struct vmem_altmap *altmap);
 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
 					  unsigned long pnum);
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 527fe4f9c620..e0340c8f6df4 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -523,7 +523,7 @@ static void __remove_section(struct zone *zone, struct mem_section *ms,
 	start_pfn = section_nr_to_pfn((unsigned long)scn_nr);
 	__remove_zone(zone, start_pfn);
-	sparse_remove_one_section(zone, ms, map_offset, altmap);
+	sparse_remove_one_section(ms, map_offset, altmap);
diff --git a/mm/sparse.c b/mm/sparse.c
index d1d5e05f5b8d..1552c855d62a 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -800,8 +800,8 @@ static void free_section_usemap(struct page *memmap, unsigned long *usemap,
-void sparse_remove_one_section(struct zone *zone, struct mem_section *ms,
-		unsigned long map_offset, struct vmem_altmap *altmap)
+void sparse_remove_one_section(struct mem_section *ms, unsigned long map_offset,
+			       struct vmem_altmap *altmap)
 	struct page *memmap = NULL;
 	unsigned long *usemap = NULL;

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