diff --git a/[refs] b/[refs]
index c3d3b50a5e4e..0c40705a0b99 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 8cab7ccccbdd9fe3cf6b3400d5a88ecb683a5b1b
+refs/heads/master: 0ffe984917b9cd6ecc19ffbc06f35869d8c18df8
diff --git a/trunk/arch/ia64/mm/fault.c b/trunk/arch/ia64/mm/fault.c
index af7eb087dca7..d98ec49570b8 100644
--- a/trunk/arch/ia64/mm/fault.c
+++ b/trunk/arch/ia64/mm/fault.c
@@ -60,6 +60,9 @@ ia64_do_page_fault (unsigned long address, unsigned long isr, struct pt_regs *re
 	struct siginfo si;
 	unsigned long mask;
 
+	/* mmap_sem is performance critical.... */
+	prefetchw(&mm->mmap_sem);
+
 	/*
 	 * If we're in an interrupt or have no user context, we must not take the fault..
 	 */