procfs: also fix proc_reg_get_unmapped_area() for !MMU case

Commit fad1a86 ("procfs: call default get_unmapped_area on
MMU-present architectures"), as its title says, took care of only the
MMU case, leaving the !MMU side still in the regressed state (returning
-EIO in all cases where pde->proc_fops->get_unmapped_area is NULL).

From the fad1a86 changelog:

 "Commit c4fe244 ("sparc: fix PCI device proc file mmap(2)") added
  proc_reg_get_unmapped_area in proc_reg_file_ops and
  proc_reg_file_ops_no_compat, by which now mmap always returns EIO if
  get_unmapped_area method is not defined for the target procfs file, which
  causes regression of mmap on /proc/vmcore.

  To address this issue, like get_unmapped_area(), call default
  current->mm->get_unmapped_area on MMU-present architectures if
  pde->proc_fops->get_unmapped_area, i.e.  the one in actual file operation
  in the procfs file, is not defined"

Signed-off-by: Jan Beulich <[email protected]>
Cc: HATAYAMA Daisuke <[email protected]>
Cc: Alexey Dobriyan <[email protected]>
Cc: David S. Miller <[email protected]>
Cc: <[email protected]>	[3.12.x]
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

fs/proc/inode.c

@@ -292,16 +292,20 @@ proc_reg_get_unmapped_area(struct file *file, unsigned long orig_addr,
 {
 	struct proc_dir_entry *pde = PDE(file_inode(file));
 	unsigned long rv = -EIO;
-	unsigned long (*get_area)(struct file *, unsigned long, unsigned long,
-				  unsigned long, unsigned long) = NULL;
+
 	if (use_pde(pde)) {
+		typeof(proc_reg_get_unmapped_area) *get_area;
+
+		get_area = pde->proc_fops->get_unmapped_area;
 #ifdef CONFIG_MMU
-		get_area = current->mm->get_unmapped_area;
+		if (!get_area)
+			get_area = current->mm->get_unmapped_area;
 #endif
-		if (pde->proc_fops->get_unmapped_area)
-			get_area = pde->proc_fops->get_unmapped_area;
+
 		if (get_area)
 			rv = get_area(file, orig_addr, len, pgoff, flags);
+		else
+			rv = orig_addr;
 		unuse_pde(pde);
 	}
 	return rv;