[PATCH] numa_maps: Fix potential crash on non IA64 platforms

numa_maps should not scan over huge vmas in order not to cause problems for
non IA64 platforms that may have pte entries pointing to huge pages in a
variety of ways in their page tables. Add a simple check to ignore vmas
containing huge pages.

Signed-off-by: Christoph Lameter <[e-mail]>
Cc: Hugh Dickins <[e-mail]>
Cc: Andi Kleen <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

mm/mempolicy.c

···
 	if (!md)
 		return 0;
 
-	check_pgd_range(vma, vma->vm_start, vma->vm_end,
+	if (!is_vm_hugetlb_page(vma))
+		check_pgd_range(vma, vma->vm_start, vma->vm_end,
 		    &node_online_map, MPOL_MF_STATS, md);
 
 	if (md->pages) {