stub_stack        284 arch/um/include/shared/os.h extern int start_userspace(unsigned long stub_stack);
stub_stack        264 arch/um/os-Linux/skas/process.c int start_userspace(unsigned long stub_stack)
stub_stack        287 arch/um/os-Linux/skas/process.c 	pid = clone(userspace_tramp, (void *) sp, flags, (void *) stub_stack);