From: Christoph Lameter <clameter@engr.sgi.com>
Date: Thu, 2 Mar 2006 10:54:37 +0000 (-0800)
Subject: [PATCH] numa_maps: Fix potential crash on non IA64 platforms
X-Git-Tag: firefly_0821_release~37800
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=a57ebfdb2cf9fa60dfa2f403f70ef6c432ca2a62;p=firefly-linux-kernel-4.4.55.git

[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 <clameter@engr.sgi.com>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 5643cfed6b0f..1a210088ad80 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1793,7 +1793,8 @@ int show_numa_map(struct seq_file *m, void *v)
 	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) {