diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index 079d17d96410..9de81112447e 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h

@@ -50,9 +50,7 @@ struct memblock_region {
 	phys_addr_t base;
 	phys_addr_t size;
 	enum memblock_flags flags;
-#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 	int nid;
-#endif

 };
 
 /**

@@ -215,7 +213,6 @@ static inline bool memblock_is_nomap(struct memblock_region *m)
 	return m->flags & MEMBLOCK_NOMAP;
 }
 
-#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn,
 			    unsigned long  *end_pfn);
 void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn,

@@ -234,7 +231,6 @@ void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn,
 #define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid)		\
 	for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \
 	     i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid))
-#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
 
 #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
 void __next_mem_pfn_range_in_zone(u64 *idx, struct zone *zone,

@@ -310,7 +306,6 @@ void __next_mem_pfn_range_in_zone(u64 *idx, struct zone *zone,
 	for_each_mem_range_rev(i, &memblock.memory, &memblock.reserved,	\
 			       nid, flags, p_start, p_end, p_nid)
 
-#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 int memblock_set_node(phys_addr_t base, phys_addr_t size,
 		      struct memblock_type *type, int nid);
 

@@ -323,16 +318,6 @@ static inline int memblock_get_region_node(const struct memblock_region *r)
 {
 	return r->nid;
 }
-#else
-static inline void memblock_set_region_node(struct memblock_region *r, int nid)
-{
-}
-
-static inline int memblock_get_region_node(const struct memblock_region *r)
-{
-	return 0;
-}
-#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
 
 /* Flags for memblock allocation APIs */
 #define MEMBLOCK_ALLOC_ANYWHERE	(~(phys_addr_t)0)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index c54fb96cb1e6..368a45d4696a 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h

@@ -2125,9 +2125,8 @@ static inline unsigned long get_num_physpages(void)
 	return phys_pages;
 }
 
-#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 /*
- * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its
+ * Using memblock node mappings, an architecture may initialise its
  * zones, allocate the backing mem_map and account for memory holes in a more
  * architecture independent manner. This is a substitute for creating the
  * zone_sizes[] and zholes_size[] arrays and passing them to

@@ -2148,9 +2147,6 @@ static inline unsigned long get_num_physpages(void)
  * registered physical page range.  Similarly
  * sparse_memory_present_with_active_regions() calls memory_present() for
  * each range when SPARSEMEM is enabled.
- *
- * See mm/page_alloc.c for more information on each function exposed by
- * CONFIG_HAVE_MEMBLOCK_NODE_MAP.
  */
 extern void free_area_init_nodes(unsigned long *max_zone_pfn);
 unsigned long node_map_pfn_alignment(void);

@@ -2165,22 +2161,12 @@ extern void free_bootmem_with_active_regions(int nid,
 						unsigned long max_low_pfn);
 extern void sparse_memory_present_with_active_regions(int nid);
 
-#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
 
-#if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \
-    !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID)
-static inline int __early_pfn_to_nid(unsigned long pfn,
-					struct mminit_pfnnid_cache *state)
-{
-	return 0;
-}
-#else
 /* please see mm/page_alloc.c */
 extern int __meminit early_pfn_to_nid(unsigned long pfn);
 /* there is a per-arch backend function. */
 extern int __meminit __early_pfn_to_nid(unsigned long pfn,
 					struct mminit_pfnnid_cache *state);
-#endif
 
 extern void set_dma_reserve(unsigned long new_dma_reserve);
 extern void memmap_init_zone(unsigned long, int, unsigned long, unsigned long,

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 462f6873905a..4422d1961d0e 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h

@@ -917,11 +917,7 @@ extern int movable_zone;
 #ifdef CONFIG_HIGHMEM
 static inline int zone_movable_is_highmem(void)
 {
-#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 	return movable_zone == ZONE_HIGHMEM;
-#else
-	return (ZONE_MOVABLE - 1) == ZONE_HIGHMEM;
-#endif
 }
 #endif
 

@@ -1121,15 +1117,6 @@ static inline struct zoneref *first_zones_zonelist(struct zonelist *zonelist,
 #include <asm/sparsemem.h>
 #endif
 
-#if !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID) && \
-	!defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP)
-static inline unsigned long early_pfn_to_nid(unsigned long pfn)
-{
-	BUILD_BUG_ON(IS_ENABLED(CONFIG_NUMA));
-	return 0;
-}
-#endif
-
 #ifdef CONFIG_FLATMEM
 #define pfn_to_nid(pfn)		(0)
 #endif

diff --git a/mm/memblock.c b/mm/memblock.c
index eba94ee3de0b..819441133a21 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c

@@ -620,9 +620,7 @@ static int __init_memblock memblock_add_range(struct memblock_type *type,
 		 * area, insert that portion.
 		 */
 		if (rbase > base) {
-#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 			WARN_ON(nid != memblock_get_region_node(rgn));
-#endif
 			WARN_ON(flags != rgn->flags);
 			nr_new++;
 			if (insert)

@@ -1197,7 +1195,6 @@ void __init_memblock __next_mem_range_rev(u64 *idx, int nid,
 	*idx = ULLONG_MAX;
 }
 
-#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 /*
  * Common iterator interface used to define for_each_mem_pfn_range().
  */

@@ -1258,7 +1255,7 @@ int __init_memblock memblock_set_node(phys_addr_t base, phys_addr_t size,
 	memblock_merge_regions(type);
 	return 0;
 }
-#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
+
 #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
 /**
  * __next_mem_pfn_range_in_zone - iterator for for_each_*_range_in_zone()

@@ -1797,7 +1794,6 @@ bool __init_memblock memblock_is_map_memory(phys_addr_t addr)
 	return !memblock_is_nomap(&memblock.memory.regions[i]);
 }
 
-#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 int __init_memblock memblock_search_pfn_nid(unsigned long pfn,
 			 unsigned long *start_pfn, unsigned long *end_pfn)
 {

@@ -1812,7 +1808,6 @@ int __init_memblock memblock_search_pfn_nid(unsigned long pfn,
 
 	return type->regions[mid].nid;
 }
-#endif
 
 /**
  * memblock_is_region_memory - check if a region is a subset of memory

@@ -1903,11 +1898,9 @@ static void __init_memblock memblock_dump(struct memblock_type *type)
 		size = rgn->size;
 		end = base + size - 1;
 		flags = rgn->flags;
-#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 		if (memblock_get_region_node(rgn) != MAX_NUMNODES)
 			snprintf(nid_buf, sizeof(nid_buf), " on node %d",
 				 memblock_get_region_node(rgn));
-#endif
 		pr_info(" %s[%#x]\t[%pa-%pa], %pa bytes%s flags: %#x\n",
 			type->name, idx, &base, &end, &size, nid_buf, flags);
 	}

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 19389cdc16a5..dc8828b087bf 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c

@@ -1366,11 +1366,7 @@ check_pages_isolated_cb(unsigned long start_pfn, unsigned long nr_pages,
 
 static int __init cmdline_parse_movable_node(char *p)
 {
-#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 	movable_node_enabled = true;
-#else
-	pr_warn("movable_node parameter depends on CONFIG_HAVE_MEMBLOCK_NODE_MAP to work properly\n");
-#endif
 	return 0;
 }
 early_param("movable_node", cmdline_parse_movable_node);

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 3c4eb750a199..84a69d6e7e61 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c

@@ -335,7 +335,6 @@ static unsigned long nr_kernel_pages __initdata;
 static unsigned long nr_all_pages __initdata;
 static unsigned long dma_reserve __initdata;
 
-#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 static unsigned long arch_zone_lowest_possible_pfn[MAX_NR_ZONES] __initdata;
 static unsigned long arch_zone_highest_possible_pfn[MAX_NR_ZONES] __initdata;
 static unsigned long required_kernelcore __initdata;

@@ -348,7 +347,6 @@ static bool mirrored_kernelcore __meminitdata;
 /* movable_zone is the "real" zone pages in ZONE_MOVABLE are taken from */
 int movable_zone;
 EXPORT_SYMBOL(movable_zone);
-#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
 
 #if MAX_NUMNODES > 1
 unsigned int nr_node_ids __read_mostly = MAX_NUMNODES;

@@ -1447,9 +1445,6 @@ void __free_pages_core(struct page *page, unsigned int order)
 	__free_pages(page, order);
 }
 
-#if defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID) || \
-	defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP)
-
 static struct mminit_pfnnid_cache early_pfnnid_cache __meminitdata;
 
 int __meminit early_pfn_to_nid(unsigned long pfn)

@@ -1465,7 +1460,6 @@ int __meminit early_pfn_to_nid(unsigned long pfn)
 
 	return nid;
 }
-#endif
 
 #ifdef CONFIG_NODES_SPAN_OTHER_NODES
 /* Only safe to use early in boot when initialisation is single-threaded */

@@ -5828,7 +5822,6 @@ void __ref build_all_zonelists(pg_data_t *pgdat)
 static bool __meminit
 overlap_memmap_init(unsigned long zone, unsigned long *pfn)
 {
-#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 	static struct memblock_region *r;
 
 	if (mirrored_kernelcore && zone == ZONE_MOVABLE) {

@@ -5844,7 +5837,7 @@ overlap_memmap_init(unsigned long zone, unsigned long *pfn)
 			return true;
 		}
 	}
-#endif
+
 	return false;
 }
 

@@ -6227,7 +6220,6 @@ void __meminit init_currently_empty_zone(struct zone *zone,
 	zone->initialized = 1;
 }
 
-#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 #ifndef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
 
 /*

@@ -6503,8 +6495,7 @@ static unsigned long __init zone_absent_pages_in_node(int nid,
 	return nr_absent;
 }
 
-#else /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
-static inline unsigned long __init zone_spanned_pages_in_node(int nid,
+static inline unsigned long __init compat_zone_spanned_pages_in_node(int nid,
 					unsigned long zone_type,
 					unsigned long node_start_pfn,
 					unsigned long node_end_pfn,

@@ -6523,7 +6514,7 @@ static inline unsigned long __init zone_spanned_pages_in_node(int nid,
 	return zones_size[zone_type];
 }
 
-static inline unsigned long __init zone_absent_pages_in_node(int nid,
+static inline unsigned long __init compat_zone_absent_pages_in_node(int nid,
 						unsigned long zone_type,
 						unsigned long node_start_pfn,
 						unsigned long node_end_pfn,

@@ -6535,13 +6526,12 @@ static inline unsigned long __init zone_absent_pages_in_node(int nid,
 	return zholes_size[zone_type];
 }
 
-#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
-
 static void __init calculate_node_totalpages(struct pglist_data *pgdat,
 						unsigned long node_start_pfn,
 						unsigned long node_end_pfn,
 						unsigned long *zones_size,
-						unsigned long *zholes_size)
+						unsigned long *zholes_size,
+						bool compat)
 {
 	unsigned long realtotalpages = 0, totalpages = 0;
 	enum zone_type i;

@@ -6549,17 +6539,38 @@ static void __init calculate_node_totalpages(struct pglist_data *pgdat,
 	for (i = 0; i < MAX_NR_ZONES; i++) {
 		struct zone *zone = pgdat->node_zones + i;
 		unsigned long zone_start_pfn, zone_end_pfn;
+		unsigned long spanned, absent;
 		unsigned long size, real_size;
 
-		size = zone_spanned_pages_in_node(pgdat->node_id, i,
-						  node_start_pfn,
-						  node_end_pfn,
-						  &zone_start_pfn,
-						  &zone_end_pfn,
-						  zones_size);
-		real_size = size - zone_absent_pages_in_node(pgdat->node_id, i,
-						  node_start_pfn, node_end_pfn,
-						  zholes_size);
+		if (compat) {
+			spanned = compat_zone_spanned_pages_in_node(
+						pgdat->node_id, i,
+						node_start_pfn,
+						node_end_pfn,
+						&zone_start_pfn,
+						&zone_end_pfn,
+						zones_size);
+			absent = compat_zone_absent_pages_in_node(
+						pgdat->node_id, i,
+						node_start_pfn,
+						node_end_pfn,
+						zholes_size);
+		} else {
+			spanned = zone_spanned_pages_in_node(pgdat->node_id, i,
+						node_start_pfn,
+						node_end_pfn,
+						&zone_start_pfn,
+						&zone_end_pfn,
+						zones_size);
+			absent = zone_absent_pages_in_node(pgdat->node_id, i,
+						node_start_pfn,
+						node_end_pfn,
+						zholes_size);
+		}
+
+		size = spanned;
+		real_size = size - absent;
+
 		if (size)
 			zone->zone_start_pfn = zone_start_pfn;
 		else

@@ -6859,10 +6870,8 @@ static void __ref alloc_node_mem_map(struct pglist_data *pgdat)
 	 */
 	if (pgdat == NODE_DATA(0)) {
 		mem_map = NODE_DATA(0)->node_mem_map;
-#if defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) || defined(CONFIG_FLATMEM)
 		if (page_to_pfn(mem_map) != pgdat->node_start_pfn)
 			mem_map -= offset;
-#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
 	}
 #endif
 }

@@ -6879,9 +6888,10 @@ static inline void pgdat_set_deferred_range(pg_data_t *pgdat)
 static inline void pgdat_set_deferred_range(pg_data_t *pgdat) {}
 #endif
 
-void __init free_area_init_node(int nid, unsigned long *zones_size,
-				   unsigned long node_start_pfn,
-				   unsigned long *zholes_size)
+void __init __free_area_init_node(int nid, unsigned long *zones_size,
+				  unsigned long node_start_pfn,
+				  unsigned long *zholes_size,
+				  bool compat)
 {
 	pg_data_t *pgdat = NODE_DATA(nid);
 	unsigned long start_pfn = 0;

@@ -6893,16 +6903,17 @@ void __init free_area_init_node(int nid, unsigned long *zones_size,
 	pgdat->node_id = nid;
 	pgdat->node_start_pfn = node_start_pfn;
 	pgdat->per_cpu_nodestats = NULL;
-#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
-	get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
-	pr_info("Initmem setup node %d [mem %#018Lx-%#018Lx]\n", nid,
-		(u64)start_pfn << PAGE_SHIFT,
-		end_pfn ? ((u64)end_pfn << PAGE_SHIFT) - 1 : 0);
-#else
-	start_pfn = node_start_pfn;
-#endif
+	if (!compat) {
+		get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
+		pr_info("Initmem setup node %d [mem %#018Lx-%#018Lx]\n", nid,
+			(u64)start_pfn << PAGE_SHIFT,
+			end_pfn ? ((u64)end_pfn << PAGE_SHIFT) - 1 : 0);
+	} else {
+		start_pfn = node_start_pfn;
+	}
+
 	calculate_node_totalpages(pgdat, start_pfn, end_pfn,
-				  zones_size, zholes_size);
+				  zones_size, zholes_size, compat);
 
 	alloc_node_mem_map(pgdat);
 	pgdat_set_deferred_range(pgdat);

@@ -6910,6 +6921,14 @@ void __init free_area_init_node(int nid, unsigned long *zones_size,
 	free_area_init_core(pgdat);
 }
 
+void __init free_area_init_node(int nid, unsigned long *zones_size,
+				unsigned long node_start_pfn,
+				unsigned long *zholes_size)
+{
+	__free_area_init_node(nid, zones_size, node_start_pfn, zholes_size,
+			      true);
+}
+
 #if !defined(CONFIG_FLAT_NODE_MEM_MAP)
 /*
  * Initialize all valid struct pages in the range [spfn, epfn) and mark them

@@ -6993,8 +7012,6 @@ static inline void __init init_unavailable_mem(void)
 }
 #endif /* !CONFIG_FLAT_NODE_MEM_MAP */
 
-#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
-
 #if MAX_NUMNODES > 1
 /*
  * Figure out the number of possible node ids.

@@ -7423,8 +7440,8 @@ void __init free_area_init_nodes(unsigned long *max_zone_pfn)
 	init_unavailable_mem();
 	for_each_online_node(nid) {
 		pg_data_t *pgdat = NODE_DATA(nid);
-		free_area_init_node(nid, NULL,
-				find_min_pfn_for_node(nid), NULL);
+		__free_area_init_node(nid, NULL,
+				      find_min_pfn_for_node(nid), NULL, false);
 
 		/* Any memory on that node */
 		if (pgdat->node_present_pages)

@@ -7489,8 +7506,6 @@ static int __init cmdline_parse_movablecore(char *p)
 early_param("kernelcore", cmdline_parse_kernelcore);
 early_param("movablecore", cmdline_parse_movablecore);
 
-#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
-
 void adjust_managed_page_count(struct page *page, long count)
 {
 	atomic_long_add(count, &page_zone(page)->managed_pages);

-- 
2.25.1