[PATCH 0/2] Enable MSR_TM lazily

[Michael Neuling]

On 14 Sep. 2016 10:12 pm, "Nicholas Piggin" <npiggin at gmail.com> wrote:
>
> On Wed, 14 Sep 2016 21:46:39 +1000
> Michael Neuling <mikey at neuling.org> wrote:
>
> > On Wed, 2016-09-14 at 21:28 +1000, Nicholas Piggin wrote:
> > > Cc'ing Carlos
> > >
> > > On Wed, 14 Sep 2016 18:02:14 +1000

> > I think we might be able to detect this case in the kernel. If it's a
tabort
> > that's trapped on, we can't have been transactional.  Hence we can
safely PC+=4
> > and leave off TM off.
> >
> > It would cost us a get_user(inst, regs->nip); but it might be worth it
for this
> > special but common case.
>
> That would take an extra trap for every syscall, I think.

You're right. That wouldn't work.

Mikey
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