From 7e9db10bacc4980ba73c6beb08f666f7af5c438c Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@elte.hu>
Date: Wed, 16 Apr 2008 01:40:00 +0200
Subject: [PATCH] --- yaml --- r: 88338 b: refs/heads/master c:
 bead9a3abd15710b0bdfd418daef606722d86282 h: refs/heads/master v: v3

---
 [refs]            |  2 +-
 trunk/mm/sparse.c | 10 ++++++++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index 60b3d06280c5..ae1ed69a893b 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: cf39cc3b56bc4a562db6242d3069f65034ec7549
+refs/heads/master: bead9a3abd15710b0bdfd418daef606722d86282
diff --git a/trunk/mm/sparse.c b/trunk/mm/sparse.c
index f6a43c09c322..98d6b39c3472 100644
--- a/trunk/mm/sparse.c
+++ b/trunk/mm/sparse.c
@@ -149,8 +149,18 @@ static inline int sparse_early_nid(struct mem_section *section)
 /* Record a memory area against a node. */
 void __init memory_present(int nid, unsigned long start, unsigned long end)
 {
+	unsigned long max_arch_pfn = 1UL << (MAX_PHYSMEM_BITS-PAGE_SHIFT);
 	unsigned long pfn;
 
+	/*
+	 * Sanity checks - do not allow an architecture to pass
+	 * in larger pfns than the maximum scope of sparsemem:
+	 */
+	if (start >= max_arch_pfn)
+		return;
+	if (end >= max_arch_pfn)
+		end = max_arch_pfn;
+
 	start &= PAGE_SECTION_MASK;
 	for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) {
 		unsigned long section = pfn_to_section_nr(pfn);