Fix an error in copy_page_range

Hi,

There is a bug in copy_page_range in current 2.6.11-rc1 with 4 level page table change. copy_page_range do a continue without adding pgds and addr when pgd_none(*src_pgd) or pgd_bad(*src_pgd).

I think it's wrong in logic, copy_page_range will run into infinite loop when when pgd_none(*src_pgd) or pgd_bad(*src_pgd).

Although maybe this bug does not break anything currently...,

Signed-off-by Zou Nan hai <[email protected]>

mm/memory.c +2 -2

@@ -442,17 +442,18 @@ int copy_page_range(struct mm_struct *ds
 		if (next > end || next <= addr)
 			next = end;
 		if (pgd_none(*src_pgd))
-			continue;
+			goto next_pgd;
 		if (pgd_bad(*src_pgd)) {
 			pgd_ERROR(*src_pgd);
 			pgd_clear(src_pgd);
-			continue;
+			goto next_pgd;