mm: Remove return value of zap_vma_ptes()

All callers of zap_vma_ptes() are not interested in the return value of
that function, so let's simplify its interface and drop the return
value.
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

include/linux/mm.h

@@ -379,7 +379,7 @@ enum page_entry_size {
 /*
  * These are the virtual MM functions - opening of an area, closing and
  * unmapping it (needed to keep files on disk up-to-date etc), pointer
- * to the functions called when a no-page or a wp-page exception occurs. 
+ * to the functions called when a no-page or a wp-page exception occurs.
  */
 struct vm_operations_struct {
 	void (*open)(struct vm_area_struct * area);
@@ -1267,10 +1267,10 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
 struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr,
 				pmd_t pmd);
 
-int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address,
-		unsigned long size);
+void zap_vma_ptes(struct vm_area_struct *vma, unsigned long address,
+		  unsigned long size);
 void zap_page_range(struct vm_area_struct *vma, unsigned long address,
-		unsigned long size);
+		    unsigned long size);
 void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
 		unsigned long start, unsigned long end);
 

mm/memory.c

@@ -1660,16 +1660,15 @@ static void zap_page_range_single(struct vm_area_struct *vma, unsigned long addr
  *
  * The entire address range must be fully contained within the vma.
  *
- * Returns 0 if successful.
  */
-int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address,
+void zap_vma_ptes(struct vm_area_struct *vma, unsigned long address,
 		unsigned long size)
 {
 	if (address < vma->vm_start || address + size > vma->vm_end ||
 	    		!(vma->vm_flags & VM_PFNMAP))
-		return -1;
+		return;
+
 	zap_page_range_single(vma, address, size, NULL);
-	return 0;
 }
 EXPORT_SYMBOL_GPL(zap_vma_ptes);