Re: [PATCH v9 2/4] LoongArch: Add kprobe support

[Tiezhu Yang]

On 12/09/2022 10:22 AM, Huacai Chen wrote:
>   cas
>
> On Thu, Dec 8, 2022 at 9:41 PM Tiezhu Yang <yangtiezhu@xxxxxxxxxxx> wrote:
> > Kprobes allows you to trap at almost any kernel address and
> > execute a callback function, this commit adds kprobe support
> > for LoongArch.

...

> > +       case KPROBE_HIT_ACTIVE:
> > +       case KPROBE_HIT_SSDONE:
> > +               /*
> > +                * In case the user-specified fault handler returned
> > +                * zero, try to fix up.
> > +                */
> > +               if (fixup_exception(regs))
> > +                       return true;
> Does here need to enable preemption too?

No need, because in this two case, after call fixup_exception() or
do_page_fault(), the original process will continue, preemption will
be enabled in the original process.

Thanks,
Tiezhu