Re: [PATCHSET 00/13] tracing/uprobes: Add support for more fetchmethods (v6)

[Oleg Nesterov]

On 11/07, Namhyung Kim wrote:
>
> On Wed, 6 Nov 2013 19:24:08 +0100, Oleg Nesterov wrote:
> >
> > Note that instruction_pointer_set() is not really nice in any case,
> > this can obviously confuse FETCH_MTD_reg("ip").
>
> Yes.
>
> >
> > But lets ignore this. The solution is simple, we can pass/use this
> > info via current->utask. We can either add the new member, or add
> > a union. Or simply reuse xol_vaddr. Doesn't matter.
>
> Okay, I'll take a look.

I guess we need the union in uprobe_task anyway... I'll send the patch
soon.

Until we have the new members in uprobe_task, you can reuse utask->vaddr,
this is safe.

IOW, you can use current->utask->vaddr instead of regs->ip (as we did
in the previous discussin) to pass the necessary info to ->fetch().

Oleg.

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