MIPS: Handle huge pages with 64KB base page size.

When using sparsemem, we need to adjust some constants as the resulting
huge pages are 512MB in size.

Signed-off-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/3745/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/Kconfig

@@ -1786,10 +1786,12 @@ endchoice
 
 config FORCE_MAX_ZONEORDER
 	int "Maximum zone order"
-	range 13 64 if SYS_SUPPORTS_HUGETLBFS && PAGE_SIZE_32KB
-	default "13" if SYS_SUPPORTS_HUGETLBFS && PAGE_SIZE_32KB
-	range 12 64 if SYS_SUPPORTS_HUGETLBFS && PAGE_SIZE_16KB
-	default "12" if SYS_SUPPORTS_HUGETLBFS && PAGE_SIZE_16KB
+	range 14 64 if HUGETLB_PAGE && PAGE_SIZE_64KB
+	default "14" if HUGETLB_PAGE && PAGE_SIZE_64KB
+	range 13 64 if HUGETLB_PAGE && PAGE_SIZE_32KB
+	default "13" if HUGETLB_PAGE && PAGE_SIZE_32KB
+	range 12 64 if HUGETLB_PAGE && PAGE_SIZE_16KB
+	default "12" if HUGETLB_PAGE && PAGE_SIZE_16KB
 	range 11 64
 	default "11"
 	help

arch/mips/include/asm/sparsemem.h

@@ -6,7 +6,11 @@
  * SECTION_SIZE_BITS		2^N: how big each section will be
  * MAX_PHYSMEM_BITS		2^N: how much memory we can have in that space
  */
-#define SECTION_SIZE_BITS       28
+#if defined(CONFIG_HUGETLB_PAGE) && defined(CONFIG_PAGE_SIZE_64KB)
+# define SECTION_SIZE_BITS	29
+#else
+# define SECTION_SIZE_BITS	28
+#endif
 #define MAX_PHYSMEM_BITS        35
 
 #endif /* CONFIG_SPARSEMEM */