diff --git a/include/linux/hmm.h b/include/linux/hmm.h
index f81fe2c0f343..51ec27a84668 100644
--- a/include/linux/hmm.h
+++ b/include/linux/hmm.h
@@ -239,36 +239,36 @@ static inline bool hmm_range_valid(struct hmm_range *range)
 }
 
 /*
- * hmm_pfn_to_page() - return struct page pointed to by a valid HMM pfn
- * @range: range use to decode HMM pfn value
- * @pfn: HMM pfn value to get corresponding struct page from
- * Returns: struct page pointer if pfn is a valid HMM pfn, NULL otherwise
+ * hmm_device_entry_to_page() - return struct page pointed to by a device entry
+ * @range: range use to decode device entry value
+ * @entry: device entry value to get corresponding struct page from
+ * Returns: struct page pointer if entry is a valid, NULL otherwise
  *
- * If the HMM pfn is valid (ie valid flag set) then return the struct page
- * matching the pfn value stored in the HMM pfn. Otherwise return NULL.
+ * If the device entry is valid (ie valid flag set) then return the struct page
+ * matching the entry value. Otherwise return NULL.
  */
-static inline struct page *hmm_pfn_to_page(const struct hmm_range *range,
-					   uint64_t pfn)
+static inline struct page *hmm_device_entry_to_page(const struct hmm_range *range,
+						    uint64_t entry)
 {
-	if (pfn == range->values[HMM_PFN_NONE])
+	if (entry == range->values[HMM_PFN_NONE])
 		return NULL;
-	if (pfn == range->values[HMM_PFN_ERROR])
+	if (entry == range->values[HMM_PFN_ERROR])
 		return NULL;
-	if (pfn == range->values[HMM_PFN_SPECIAL])
+	if (entry == range->values[HMM_PFN_SPECIAL])
 		return NULL;
-	if (!(pfn & range->flags[HMM_PFN_VALID]))
+	if (!(entry & range->flags[HMM_PFN_VALID]))
 		return NULL;
-	return pfn_to_page(pfn >> range->pfn_shift);
+	return pfn_to_page(entry >> range->pfn_shift);
 }
 
 /*
- * hmm_pfn_to_pfn() - return pfn value store in a HMM pfn
- * @range: range use to decode HMM pfn value
- * @pfn: HMM pfn value to extract pfn from
- * Returns: pfn value if HMM pfn is valid, -1UL otherwise
+ * hmm_device_entry_to_pfn() - return pfn value store in a device entry
+ * @range: range use to decode device entry value
+ * @entry: device entry to extract pfn from
+ * Returns: pfn value if device entry is valid, -1UL otherwise
  */
-static inline unsigned long hmm_pfn_to_pfn(const struct hmm_range *range,
-					   uint64_t pfn)
+static inline unsigned long
+hmm_device_entry_to_pfn(const struct hmm_range *range, uint64_t pfn)
 {
 	if (pfn == range->values[HMM_PFN_NONE])
 		return -1UL;
@@ -282,31 +282,66 @@ static inline unsigned long hmm_pfn_to_pfn(const struct hmm_range *range,
 }
 
 /*
- * hmm_pfn_from_page() - create a valid HMM pfn value from struct page
+ * hmm_device_entry_from_page() - create a valid device entry for a page
  * @range: range use to encode HMM pfn value
- * @page: struct page pointer for which to create the HMM pfn
- * Returns: valid HMM pfn for the page
+ * @page: page for which to create the device entry
+ * Returns: valid device entry for the page
  */
-static inline uint64_t hmm_pfn_from_page(const struct hmm_range *range,
-					 struct page *page)
+static inline uint64_t hmm_device_entry_from_page(const struct hmm_range *range,
+						  struct page *page)
 {
 	return (page_to_pfn(page) << range->pfn_shift) |
 		range->flags[HMM_PFN_VALID];
 }
 
 /*
- * hmm_pfn_from_pfn() - create a valid HMM pfn value from pfn
+ * hmm_device_entry_from_pfn() - create a valid device entry value from pfn
  * @range: range use to encode HMM pfn value
- * @pfn: pfn value for which to create the HMM pfn
- * Returns: valid HMM pfn for the pfn
+ * @pfn: pfn value for which to create the device entry
+ * Returns: valid device entry for the pfn
  */
-static inline uint64_t hmm_pfn_from_pfn(const struct hmm_range *range,
-					unsigned long pfn)
+static inline uint64_t hmm_device_entry_from_pfn(const struct hmm_range *range,
+						 unsigned long pfn)
 {
 	return (pfn << range->pfn_shift) |
 		range->flags[HMM_PFN_VALID];
 }
 
+/*
+ * Old API:
+ * hmm_pfn_to_page()
+ * hmm_pfn_to_pfn()
+ * hmm_pfn_from_page()
+ * hmm_pfn_from_pfn()
+ *
+ * This are the OLD API please use new API, it is here to avoid cross-tree
+ * merge painfullness ie we convert things to new API in stages.
+ */
+static inline struct page *hmm_pfn_to_page(const struct hmm_range *range,
+					   uint64_t pfn)
+{
+	return hmm_device_entry_to_page(range, pfn);
+}
+
+static inline unsigned long hmm_pfn_to_pfn(const struct hmm_range *range,
+					   uint64_t pfn)
+{
+	return hmm_device_entry_to_pfn(range, pfn);
+}
+
+static inline uint64_t hmm_pfn_from_page(const struct hmm_range *range,
+					 struct page *page)
+{
+	return hmm_device_entry_from_page(range, page);
+}
+
+static inline uint64_t hmm_pfn_from_pfn(const struct hmm_range *range,
+					unsigned long pfn)
+{
+	return hmm_device_entry_from_pfn(range, pfn);
+}
+
+
 
 #if IS_ENABLED(CONFIG_HMM_MIRROR)
 /*
diff --git a/mm/hmm.c b/mm/hmm.c
index 95fa7abb9d67..44a238642b1d 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -543,7 +543,7 @@ static int hmm_vma_handle_pmd(struct mm_walk *walk,
 			if (unlikely(!hmm_vma_walk->pgmap))
 				return -EBUSY;
 		}
-		pfns[i] = hmm_pfn_from_pfn(range, pfn) | cpu_flags;
+		pfns[i] = hmm_device_entry_from_pfn(range, pfn) | cpu_flags;
 	}
 	if (hmm_vma_walk->pgmap) {
 		put_dev_pagemap(hmm_vma_walk->pgmap);
@@ -611,7 +611,8 @@ static int hmm_vma_handle_pte(struct mm_walk *walk, unsigned long addr,
 					   &fault, &write_fault);
 			if (fault || write_fault)
 				goto fault;
-			*pfn = hmm_pfn_from_pfn(range, swp_offset(entry));
+			*pfn = hmm_device_entry_from_pfn(range,
+					    swp_offset(entry));
 			*pfn |= cpu_flags;
 			return 0;
 		}
@@ -649,7 +650,7 @@ static int hmm_vma_handle_pte(struct mm_walk *walk, unsigned long addr,
 		return -EFAULT;
 	}
 
-	*pfn = hmm_pfn_from_pfn(range, pte_pfn(pte)) | cpu_flags;
+	*pfn = hmm_device_entry_from_pfn(range, pte_pfn(pte)) | cpu_flags;
 	return 0;
 
 fault:
@@ -803,7 +804,8 @@ again:
 					      hmm_vma_walk->pgmap);
 			if (unlikely(!hmm_vma_walk->pgmap))
 				return -EBUSY;
-			pfns[i] = hmm_pfn_from_pfn(range, pfn) | cpu_flags;
+			pfns[i] = hmm_device_entry_from_pfn(range, pfn) |
+				  cpu_flags;
 		}
 		if (hmm_vma_walk->pgmap) {
 			put_dev_pagemap(hmm_vma_walk->pgmap);
@@ -879,7 +881,8 @@ static int hmm_vma_walk_hugetlb_entry(pte_t *pte, unsigned long hmask,
 
 	pfn = pte_pfn(entry) + ((start & mask) >> range->page_shift);
 	for (; addr < end; addr += size, i++, pfn += pfn_inc)
-		range->pfns[i] = hmm_pfn_from_pfn(range, pfn) | cpu_flags;
+		range->pfns[i] = hmm_device_entry_from_pfn(range, pfn) |
+				 cpu_flags;
 	hmm_vma_walk->last = end;
 
 unlock:
@@ -1222,7 +1225,7 @@ long hmm_range_dma_map(struct hmm_range *range,
 		 */
 		daddrs[i] = 0;
 
-		page = hmm_pfn_to_page(range, range->pfns[i]);
+		page = hmm_device_entry_to_page(range, range->pfns[i]);
 		if (page == NULL)
 			continue;
 
@@ -1252,7 +1255,7 @@ unmap:
 		enum dma_data_direction dir = DMA_TO_DEVICE;
 		struct page *page;
 
-		page = hmm_pfn_to_page(range, range->pfns[i]);
+		page = hmm_device_entry_to_page(range, range->pfns[i]);
 		if (page == NULL)
 			continue;
 
@@ -1307,7 +1310,7 @@ long hmm_range_dma_unmap(struct hmm_range *range,
 		enum dma_data_direction dir = DMA_TO_DEVICE;
 		struct page *page;
 
-		page = hmm_pfn_to_page(range, range->pfns[i]);
+		page = hmm_device_entry_to_page(range, range->pfns[i]);
 		if (page == NULL)
 			continue;