On Mon, 1 Feb 2021, Jiaxun Yang wrote: > > Thank you for your reply, and now I know. Before that, I saw the macro > > from arch/mips/include/asm/regdef.h and thought it needed to be modified > > here. But that seems have no sence. > > Please ignore this patch. > > I guess that's for uapi consideration. Nope, it's not under arch/mips/include/uapi/, but this is a common MIPS header used across many projects (see the copyright notices at the top going back to 1985), so there has been no sense to make Linux-specific changes to it just for the sake of it given that it works as it stands. Don't fix what ain't broke. Don't make changes just because you can. Maciej