[SPARC64]: Fix 2 bugs in huge page support.
1) huge_pte_offset() did not check the page table hierarchy
elements as being empty correctly, resulting in an OOPS
2) Need platform specific hugetlb_get_unmapped_area() to handle
the top-down vs. bottom-up address space allocation strategies.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/asm-sparc64/page.h b/include/asm-sparc64/page.h
index f6b4925..fcb2812 100644
--- a/include/asm-sparc64/page.h
+++ b/include/asm-sparc64/page.h
@@ -104,6 +104,7 @@
#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
#define ARCH_HAS_SETCLEAR_HUGE_PTE
#define ARCH_HAS_HUGETLB_PREFAULT_HOOK
+#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
#endif
#define TASK_UNMAPPED_BASE (test_thread_flag(TIF_32BIT) ? \