If sparsemem is activated all sections with present pages must
be accordingly marked after memblock is fully initialized.

Signed-off-by: Serge Semin <fancer.lan...@gmail.com>
---
 arch/mips/kernel/setup.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index b121fa702..6df1eaf38 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -778,7 +778,7 @@ static void __init request_crashkernel(struct resource *res)
 
 static void __init arch_mem_init(char **cmdline_p)
 {
-       struct memblock_region *reg;
+       struct memblock_region *reg __maybe_unused;
        extern void plat_mem_setup(void);
 
        /* call board setup routine */
@@ -860,6 +860,11 @@ static void __init arch_mem_init(char **cmdline_p)
                                 crashk_res.end - crashk_res.start + 1);
 #endif
        device_tree_init();
+#ifdef CONFIG_SPARSEMEM
+       for_each_memblock(memory, reg)
+               memory_present(0, memblock_region_memory_base_pfn(reg),
+                               memblock_region_memory_end_pfn(reg));
+#endif /* CONFIG_SPARSEMEM */
        sparse_init();
        plat_swiotlb_setup();
 
-- 
2.12.0

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