sh: Fix hugetlbfs dependencies for SH-3 && MMU configurations.

The hugetlb dependencies presently depend on SUPERH && MMU while the
hugetlb page size definitions depend on CPU_SH4 or CPU_SH5. This
unfortunately allows SH-3 + MMU configurations to enable hugetlbfs
without a corresponding HPAGE_SHIFT definition, resulting in the build
blowing up.

As SH-3 doesn't support variable page sizes, we tighten up the
dependenies a bit to prevent hugetlbfs from being enabled. These days
we also have a shiny new SYS_SUPPORTS_HUGETLBFS, so switch to using
that rather than adding to the list of corner cases in fs/Kconfig.

Reported-by: Kristoffer Ericson <kristoffer.ericson@gmail.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/Kconfig

@@ -121,6 +121,9 @@ config SYS_SUPPORTS_APM_EMULATION
 	bool
 	select ARCH_SUSPEND_POSSIBLE
 
+config SYS_SUPPORTS_HUGETLBFS
+	bool
+
 config SYS_SUPPORTS_SMP
 	bool
 
@@ -195,6 +198,7 @@ config CPU_SH4
 	select CPU_HAS_SR_RB
 	select CPU_HAS_FPU if !CPU_SH4AL_DSP
 	select SYS_SUPPORTS_TMU
+	select SYS_SUPPORTS_HUGETLBFS if MMU
 
 config CPU_SH4A
 	bool
@@ -209,6 +213,7 @@ config CPU_SH5
 	bool
 	select CPU_HAS_FPU
 	select SYS_SUPPORTS_TMU
+	select SYS_SUPPORTS_HUGETLBFS if MMU
 
 config CPU_SHX2
 	bool

arch/sh/mm/Kconfig

@@ -227,7 +227,7 @@ endchoice
 
 choice
 	prompt "HugeTLB page size"
-	depends on HUGETLB_PAGE && (CPU_SH4 || CPU_SH5) && MMU
+	depends on HUGETLB_PAGE
 	default HUGETLB_PAGE_SIZE_1MB if PAGE_SIZE_64KB
 	default HUGETLB_PAGE_SIZE_64K