--- arch/x86/lib/Makefile

+++ arch/x86/lib/Makefile

@@ -2,7 +2,7 @@

# Makefile for x86 specific library files.

#

-obj-$(CONFIG_SMP) += msr-smp.o

+obj-$(CONFIG_SMP) += msr-smp.o cache-smp.o

lib-y := delay.o

lib-y += thunk_$(BITS).o

@@ -26,4 +26,5 @@ else

lib-y += thunk_64.o clear_page_64.o copy_page_64.o

lib-y += memmove_64.o memset_64.o

lib-y += copy_user_64.o rwlock_64.o copy_user_nocache_64.o

+ lib-$(CONFIG_RWSEM_XCHGADD_ALGORITHM) += rwsem_64.o

endif