and I suspect on any nommu:

In file included from kernel/fork.c:52:
include/linux/ksm.h:129: warning: 'enum ttu_flags' declared inside parameter 
list
include/linux/ksm.h:129: warning: its scope is only this definition or 
declaration, which is probably not what you want
include/linux/ksm.h:129: error: parameter 2 ('flags') has incomplete type
make[1]: *** [kernel/fork.o] Error 1
make[1]: *** Waiting for unfinished jobs....

-- 
Steven King -- sfking at fdwdc dot com