arm64: mm: reserve hugetlb CMA after numa_init

hugetlb_cma_reserve() is called at the wrong place. numa_init has not been
done yet. so all reserved memory will be located at node0.

Fixes: cf11e85fc08c ("mm: hugetlb: optionally allocate gigantic hugepages using cma")
Signed-off-by: Barry Song <song.bao.hua@hisilicon.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Acked-by: Roman Gushchin <guro@fb.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20200617215828.25296-1-song.bao.hua@hisilicon.com
Signed-off-by: Will Deacon <will@kernel.org>

diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index e631e64..1e93cfc 100644 (file)
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -404,11 +404,6 @@ void __init arm64_memblock_init(void)
        high_memory = __va(memblock_end_of_DRAM() - 1) + 1;
 
        dma_contiguous_reserve(arm64_dma32_phys_limit);
-
-#ifdef CONFIG_ARM64_4K_PAGES
-       hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
-#endif
-
 }
 
 void __init bootmem_init(void)
@@ -424,6 +419,16 @@ void __init bootmem_init(void)
        min_low_pfn = min;
 
        arm64_numa_init();
+
+       /*
+        * must be done after arm64_numa_init() which calls numa_init() to
+        * initialize node_online_map that gets used in hugetlb_cma_reserve()
+        * while allocating required CMA size across online nodes.
+        */
+#ifdef CONFIG_ARM64_4K_PAGES
+       hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
+#endif
+
        /*
         * Sparsemem tries to allocate bootmem in memory_present(), so must be
         * done after the fixed reservations.