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-rw-r--r--mm/sparse.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/mm/sparse.c b/mm/sparse.c
index f6a43c09c322..98d6b39c3472 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -149,8 +149,18 @@ static inline int sparse_early_nid(struct mem_section *section)
149/* Record a memory area against a node. */ 149/* Record a memory area against a node. */
150void __init memory_present(int nid, unsigned long start, unsigned long end) 150void __init memory_present(int nid, unsigned long start, unsigned long end)
151{ 151{
152 unsigned long max_arch_pfn = 1UL << (MAX_PHYSMEM_BITS-PAGE_SHIFT);
152 unsigned long pfn; 153 unsigned long pfn;
153 154
155 /*
156 * Sanity checks - do not allow an architecture to pass
157 * in larger pfns than the maximum scope of sparsemem:
158 */
159 if (start >= max_arch_pfn)
160 return;
161 if (end >= max_arch_pfn)
162 end = max_arch_pfn;
163
154 start &= PAGE_SECTION_MASK; 164 start &= PAGE_SECTION_MASK;
155 for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) { 165 for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) {
156 unsigned long section = pfn_to_section_nr(pfn); 166 unsigned long section = pfn_to_section_nr(pfn);