diff --git a/[refs] b/[refs]
index 2b37726bc7d4..c72a66ebd9c2 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: bafaecd11df15ad5b1e598adc7736afcd38ee13d
+refs/heads/master: 4126faf0ab7417fbc6eb99fb0fd407e01e9e9dfe
diff --git a/trunk/arch/um/sys-x86_64/Makefile b/trunk/arch/um/sys-x86_64/Makefile
index 2201e9c20e4a..c1ea9eb04466 100644
--- a/trunk/arch/um/sys-x86_64/Makefile
+++ b/trunk/arch/um/sys-x86_64/Makefile
@@ -8,7 +8,8 @@ obj-y = bug.o bugs.o delay.o fault.o ldt.o mem.o ptrace.o ptrace_user.o \
 	setjmp.o signal.o stub.o stub_segv.o syscalls.o syscall_table.o \
 	sysrq.o ksyms.o tls.o
 
-subarch-obj-y = lib/csum-partial_64.o lib/memcpy_64.o lib/thunk_64.o
+subarch-obj-y = lib/csum-partial_64.o lib/memcpy_64.o lib/thunk_64.o \
+		lib/rwsem_64.o
 subarch-obj-$(CONFIG_MODULES) += kernel/module.o
 
 ldt-y = ../sys-i386/ldt.o