MIPS: Transparent Huge Pages support

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 20 insertions, 0 deletions

diff --git a/arch/mips/mm/tlb-r4k.c b/arch/mips/mm/tlb-r4k.c
index 936165d167e1..94ad86d055c5 100644
--- a/arch/mips/mm/tlb-r4k.c
+++ b/arch/mips/mm/tlb-r4k.c
@@ -377,6 +377,26 @@ void add_wired_entry(unsigned long entrylo0, unsigned long entrylo1,
         EXIT_CRITICAL(flags);
 }
 
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+
+int __init has_transparent_hugepage(void)
+{
+        unsigned int mask;
+        unsigned long flags;
+
+        ENTER_CRITICAL(flags);
+        write_c0_pagemask(PM_HUGE_MASK);
+        back_to_back_c0_hazard();
+        mask = read_c0_pagemask();
+        write_c0_pagemask(PM_DEFAULT_MASK);
+
+        EXIT_CRITICAL(flags);
+
+        return mask == PM_HUGE_MASK;
+}
+
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE  */
+
 static int __cpuinitdata ntlb;
 static int __init set_ntlb(char *str)
 {