mm/sparsemem: Allocate mem_section at runtime for CONFIG_SPARSEMEM_EXTREME=y

[uclinux-h8/linux.git] / mm / page_alloc.c

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 77e4d3c..8dfd13f 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5646,6 +5646,16 @@ void __init sparse_memory_present_with_active_regions(int nid)
        unsigned long start_pfn, end_pfn;
        int i, this_nid;
 
+#ifdef CONFIG_SPARSEMEM_EXTREME
+       if (!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
+
        for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, &this_nid)
                memory_present(this_nid, start_pfn, end_pfn);
 }