On Fri, 2 Feb 2024 at 04:30, Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx> wrote: > > ptrace: Introduce exception_ip arch hook > MIPS: Clear Cause.BD in instruction_pointer_set > mm/memory: Use exception ip to search exception tables Just to clarify: does that second patch fix the problem that __isa_exception_epc() does a __get_user()? Because that mm/memory.c use of "exception_ip()" most definitely cannot take a page fault. So if MIPS cannot do that whole exception IP thing without potentially touching user space, I do worry that we might just have to add a #ifndef __MIPS__ around this all. Possibly somehow limited to just the microMIPS/MIPS16e case in Kconfig instead? Linus