diff --git a/mm/pkram.c b/mm/pkram.c
index 3790e5180feb..c649504fa1fa 100644
--- a/mm/pkram.c
+++ b/mm/pkram.c
@@ -7,6 +7,7 @@
 #include <linux/kernel.h>
 #include <linux/kobject.h>
 #include <linux/list.h>
+#include <linux/memblock.h>
 #include <linux/mm.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
@@ -1138,3 +1139,246 @@ static unsigned long pkram_populate_regions_list(void)
 
 	return priv.nr_regions;
 }
+
+struct pkram_region *pkram_first_region(struct pkram_super_block *sb,
+					struct pkram_region_list **rlp, int *idx)
+{
+	WARN_ON(!sb);
+	WARN_ON(!sb->region_list_pfn);
+
+	if (!sb || !sb->region_list_pfn)
+		return NULL;
+
+	*rlp = pfn_to_kaddr(sb->region_list_pfn);
+	*idx = 0;
+
+	return &(*rlp)->regions[0];
+}
+
+struct pkram_region *pkram_next_region(struct pkram_region_list **rlp, int *idx)
+{
+	struct pkram_region_list *rl = *rlp;
+	int i = *idx;
+
+	i++;
+	if (i >= PKRAM_REGIONS_LIST_MAX) {
+		if (!rl->next_pfn) {
+			pr_err("PKRAM: %s: no more pkram_region_list pages\n", __func__);
+			return NULL;
+		}
+		rl = pfn_to_kaddr(rl->next_pfn);
+		*rlp = rl;
+		i = 0;
+	}
+	*idx = i;
+
+	if (rl->regions[i].size == 0)
+		return NULL;
+
+	return &rl->regions[i];
+}
+
+struct pkram_region *pkram_first_region_topdown(struct pkram_super_block *sb,
+						struct pkram_region_list **rlp, int *idx)
+{
+	struct pkram_region_list *rl;
+
+	WARN_ON(!sb);
+	WARN_ON(!sb->region_list_pfn);
+
+	if (!sb || !sb->region_list_pfn)
+		return NULL;
+
+	rl = pfn_to_kaddr(sb->region_list_pfn);
+	if (!rl->prev_pfn) {
+		WARN_ON(1);
+		return NULL;
+	}
+	rl = pfn_to_kaddr(rl->prev_pfn);
+
+	*rlp = rl;
+
+	*idx = (sb->nr_regions - 1) % PKRAM_REGIONS_LIST_MAX;
+
+	return &rl->regions[*idx];
+}
+
+struct pkram_region *pkram_next_region_topdown(struct pkram_region_list **rlp, int *idx)
+{
+	struct pkram_region_list *rl = *rlp;
+	int i = *idx;
+
+	if (i == 0) {
+		if (!rl->prev_pfn)
+			return NULL;
+		rl = pfn_to_kaddr(rl->prev_pfn);
+		*rlp = rl;
+		i = PKRAM_REGIONS_LIST_MAX - 1;
+	} else
+		i--;
+
+	*idx = i;
+
+	return &rl->regions[i];
+}
+
+/*
+ * Use the pkram regions list to allocate a block of memory that does
+ * not overlap with preserved pages.
+ */
+phys_addr_t __init alloc_topdown(phys_addr_t size)
+{
+	phys_addr_t hole_start, hole_end, hole_size;
+	struct pkram_region_list *rl;
+	struct pkram_region *r;
+	phys_addr_t addr = 0;
+	int idx;
+
+	hole_end = memblock.current_limit;
+	r = pkram_first_region_topdown(pkram_sb, &rl, &idx);
+
+	while (r) {
+		hole_start = r->base + r->size;
+		hole_size = hole_end - hole_start;
+
+		if (hole_size >= size) {
+			addr = memblock_phys_alloc_range(size, PAGE_SIZE,
+							hole_start, hole_end);
+			if (addr)
+				break;
+		}
+
+		hole_end = r->base;
+		r = pkram_next_region_topdown(&rl, &idx);
+	}
+
+	if (!addr)
+		addr = memblock_phys_alloc_range(size, PAGE_SIZE, 0, hole_end);
+
+	return addr;
+}
+
+int __init pkram_create_merged_reserved(struct memblock_type *new)
+{
+	unsigned long cnt_a;
+	unsigned long cnt_b;
+	long i, j, k;
+	struct memblock_region *r;
+	struct memblock_region *rgn;
+	struct pkram_region *pkr;
+	struct pkram_region_list *rl;
+	int idx;
+	unsigned long total_size = 0;
+	unsigned long nr_preserved = 0;
+
+	cnt_a = memblock.reserved.cnt;
+	cnt_b = pkram_sb->nr_regions;
+
+	i = 0;
+	j = 0;
+	k = 0;
+
+	pkr = pkram_first_region(pkram_sb, &rl, &idx);
+	if (!pkr)
+		return -EINVAL;
+	while (i < cnt_a && j < cnt_b && pkr) {
+		r = &memblock.reserved.regions[i];
+		rgn = &new->regions[k];
+
+		if (r->base + r->size <= pkr->base) {
+			*rgn = *r;
+			i++;
+		} else if (pkr->base + pkr->size <= r->base) {
+			rgn->base = pkr->base;
+			rgn->size = pkr->size;
+			memblock_set_region_node(rgn, MAX_NUMNODES);
+
+			nr_preserved +=  (rgn->size >> PAGE_SHIFT);
+			pkr = pkram_next_region(&rl, &idx);
+			j++;
+		} else {
+			pr_err("PKRAM: unexpected overlap:\n");
+			pr_err("PKRAM: reserved: base=%pa,size=%pa,flags=0x%x\n", &r->base,
+				&r->size, (int)r->flags);
+			pr_err("PKRAM: pkram: base=%pa,size=%pa\n", &pkr->base, &pkr->size);
+			return -EBUSY;
+		}
+		total_size += rgn->size;
+		k++;
+	}
+
+	while (i < cnt_a) {
+		r = &memblock.reserved.regions[i];
+		rgn = &new->regions[k];
+
+		*rgn = *r;
+
+		total_size += rgn->size;
+		i++;
+		k++;
+	}
+	while (j < cnt_b && pkr) {
+		rgn = &new->regions[k];
+		rgn->base = pkr->base;
+		rgn->size = pkr->size;
+		memblock_set_region_node(rgn, MAX_NUMNODES);
+
+		nr_preserved += (rgn->size >> PAGE_SHIFT);
+		total_size += rgn->size;
+		pkr = pkram_next_region(&rl, &idx);
+		j++;
+		k++;
+	}
+
+	WARN_ON(cnt_a + cnt_b != k);
+	new->cnt = cnt_a + cnt_b;
+	new->total_size = total_size;
+
+	return 0;
+}
+
+/*
+ * Reserve pages that belong to preserved memory.  This is accomplished by
+ * merging the existing reserved ranges with the preserved ranges into
+ * a new, sufficiently sized memblock reserved array.
+ *
+ * This function should be called at boot time as early as possible to prevent
+ * preserved memory from being recycled.
+ */
+int __init pkram_merge_with_reserved(void)
+{
+	struct memblock_type new;
+	unsigned long new_max;
+	phys_addr_t new_size;
+	phys_addr_t addr;
+	int err;
+
+	/*
+	 * Need space to insert one more range into memblock.reserved
+	 * without memblock_double_array() being called.
+	 */
+	if (memblock.reserved.cnt == memblock.reserved.max) {
+		WARN_ONCE(1, "PKRAM: no space for new memblock list\n");
+		return -ENOMEM;
+	}
+
+	new_max = memblock.reserved.max + pkram_sb->nr_regions;
+	new_size = PAGE_ALIGN(sizeof(struct memblock_region) * new_max);
+
+	addr = alloc_topdown(new_size);
+	if (!addr)
+		return -ENOMEM;
+
+	new.regions = __va(addr);
+	new.max = new_max;
+	err = pkram_create_merged_reserved(&new);
+	if (err)
+		return err;
+
+	memblock.reserved.cnt = new.cnt;
+	memblock.reserved.max = new.max;
+	memblock.reserved.total_size = new.total_size;
+	memblock.reserved.regions = new.regions;
+
+	return 0;
+}
