> >Maybe I'm dense but I still don't get - frame has a pt_regs so why
> >isn't the caller allowed to know about that fact?
>
> Because the fact that there is a regs fields and the PC is accessible through it is architecture specific, yet the
> caller (kernel/unwind.c) ought to be architecture independent.
I doubt we have any architecture where the instruction pointer is not in pt_regs,
but ok.
-Andi
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