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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 b00a97398795..d294148ba395 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -206,6 +206,16 @@ void __init memory_present(int nid, unsigned long start, unsigned long end)
{
unsigned long pfn;
+#ifdef CONFIG_SPARSEMEM_EXTREME
+ if (unlikely(!mem_section)) {
+ unsigned long size, align;
+
+ size = sizeof(struct mem_section) * NR_SECTION_ROOTS;
+ align = 1 << (INTERNODE_CACHE_SHIFT);
+ mem_section = memblock_virt_alloc(size, align);
+ }
+#endif
+
start &= PAGE_SECTION_MASK;
mminit_validate_memmodel_limits(&start, &end);
for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) {