vma_page_offset() has no callees: drop it

Hugh adds: vma_pagecache_offset() has a dangerously misleading name, since
it's using hugepage units: rename it to vma_hugecache_offset().

[[e-mail]: restack onto fixed MAP_PRIVATE reservations]
[[e-mail]: vma_split conversion]
Signed-off-by: Johannes Weiner <[e-mail]>
Signed-off-by: Hugh Dickins <[e-mail]>
Cc: Adam Litke <[e-mail]>
Cc: Nishanth Aravamudan <[e-mail]>
Cc: Andi Kleen <[e-mail]>
Cc: Nick Piggin <[e-mail]>
Signed-off-by: Andy Whitcroft <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

mm/hugetlb.c

···
 
 /*
  * Convert the address within this vma to the page offset within
- * the mapping, in base page units.
- */
-static pgoff_t vma_page_offset(struct vm_area_struct *vma,
-				unsigned long address)
-{
-	return ((address - vma->vm_start) >> PAGE_SHIFT) +
-					(vma->vm_pgoff >> PAGE_SHIFT);
-}
-
-/*
- * Convert the address within this vma to the page offset within
  * the mapping, in pagecache page units; huge pages here.
  */
-static pgoff_t vma_pagecache_offset(struct vm_area_struct *vma,
+static pgoff_t vma_hugecache_offset(struct vm_area_struct *vma,
 					unsigned long address)
 {
 	return ((address - vma->vm_start) >> HPAGE_SHIFT) +
···
 	struct inode *inode = mapping->host;
 
 	if (vma->vm_flags & VM_SHARED) {
-		pgoff_t idx = vma_pagecache_offset(vma, addr);
+		pgoff_t idx = vma_hugecache_offset(vma, addr);
 		return region_chg(&inode->i_mapping->private_list,
 							idx, idx + 1);
 
···
 
 	} else  {
 		int err;
-		pgoff_t idx = vma_pagecache_offset(vma, addr);
+		pgoff_t idx = vma_hugecache_offset(vma, addr);
 		struct resv_map *reservations = vma_resv_map(vma);
 
 		err = region_chg(&reservations->regions, idx, idx + 1);
···
 	struct inode *inode = mapping->host;
 
 	if (vma->vm_flags & VM_SHARED) {
-		pgoff_t idx = vma_pagecache_offset(vma, addr);
+		pgoff_t idx = vma_hugecache_offset(vma, addr);
 		region_add(&inode->i_mapping->private_list, idx, idx + 1);
 
 	} else if (is_vma_resv_set(vma, HPAGE_RESV_OWNER)) {
-		pgoff_t idx = vma_pagecache_offset(vma, addr);
+		pgoff_t idx = vma_hugecache_offset(vma, addr);
 		struct resv_map *reservations = vma_resv_map(vma);
 
 		/* Mark this page used in the map. */
···
 	unsigned long end;
 
 	if (reservations) {
-		start = vma_pagecache_offset(vma, vma->vm_start);
-		end = vma_pagecache_offset(vma, vma->vm_end);
+		start = vma_hugecache_offset(vma, vma->vm_start);
+		end = vma_hugecache_offset(vma, vma->vm_end);
 
 		reserve = (end - start) -
 			region_count(&reservations->regions, start, end);
···
 	pgoff_t idx;
 
 	mapping = vma->vm_file->f_mapping;
-	idx = vma_pagecache_offset(vma, address);
+	idx = vma_hugecache_offset(vma, address);
 
 	return find_lock_page(mapping, idx);
 }
···
 	}
 
 	mapping = vma->vm_file->f_mapping;
-	idx = vma_pagecache_offset(vma, address);
+	idx = vma_hugecache_offset(vma, address);
 
 	/*
 	 * Use page lock to guard against racing truncation