MIPS: Kconfig Add SYS_SUPPORTS_HUGETLBFS and enable it for some systems.

Add new kconfig variables SYS_SUPPORTS_HUGETLBFS and
CPU_SUPPORTS_HUGEPAGES.  They are enabled for systems that are known
to support huge pages.
Signed-off-by: NDavid Daney <ddaney@caviumnetworks.com>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/Kconfig

@@ -853,6 +853,11 @@ config SYS_SUPPORTS_BIG_ENDIAN
 config SYS_SUPPORTS_LITTLE_ENDIAN
 	bool
 
+config SYS_SUPPORTS_HUGETLBFS
+	bool
+	depends on CPU_SUPPORTS_HUGEPAGES && 64BIT
+	default y
+
 config IRQ_CPU
 	bool
 
@@ -1057,6 +1062,7 @@ config CPU_MIPS64_R1
 	select CPU_SUPPORTS_32BIT_KERNEL
 	select CPU_SUPPORTS_64BIT_KERNEL
 	select CPU_SUPPORTS_HIGHMEM
+	select CPU_SUPPORTS_HUGEPAGES
 	help
 	  Choose this option to build a kernel for release 1 or later of the
 	  MIPS64 architecture.  Many modern embedded systems with a 64-bit
@@ -1076,6 +1082,7 @@ config CPU_MIPS64_R2
 	select CPU_SUPPORTS_32BIT_KERNEL
 	select CPU_SUPPORTS_64BIT_KERNEL
 	select CPU_SUPPORTS_HIGHMEM
+	select CPU_SUPPORTS_HUGEPAGES
 	help
 	  Choose this option to build a kernel for release 2 or later of the
 	  MIPS64 architecture.  Many modern embedded systems with a 64-bit
@@ -1162,6 +1169,7 @@ config CPU_R5500
 	select CPU_HAS_LLSC
 	select CPU_SUPPORTS_32BIT_KERNEL
 	select CPU_SUPPORTS_64BIT_KERNEL
+	select CPU_SUPPORTS_HUGEPAGES
 	help
 	  NEC VR5500 and VR5500A series processors implement 64-bit MIPS IV
 	  instruction set.
@@ -1247,6 +1255,7 @@ config CPU_CAVIUM_OCTEON
 	select WEAK_ORDERING
 	select WEAK_REORDERING_BEYOND_LLSC
 	select CPU_SUPPORTS_HIGHMEM
+	select CPU_SUPPORTS_HUGEPAGES
 	help
 	  The Cavium Octeon processor is a highly integrated chip containing
 	  many ethernet hardware widgets for networking tasks. The processor
@@ -1366,6 +1375,8 @@ config CPU_SUPPORTS_32BIT_KERNEL
 	bool
 config CPU_SUPPORTS_64BIT_KERNEL
 	bool
+config CPU_SUPPORTS_HUGEPAGES
+	bool
 
 #
 # Set to y for ptrace access to watch registers.