Re: [PATCH v2 0/3] Handle delay slot for extable lookup

[Linus Torvalds]

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