On Thu, Aug 05, 2021 at 10:05:17PM +0800, Tianyu Lan wrote: > +static int default_set_memory_enc(unsigned long addr, int numpages, bool > enc) > +{ > + return 0; > +} > + > +DEFINE_STATIC_CALL(x86_set_memory_enc, default_set_memory_enc); That's spelled: DEFINE_STATIC_CALL_RET0(x86_set_memory_enc, __set_memory_enc_dec); And then you can remove the default_set_memory_enc() thing.