Re: [PATCH v2 3/5] locking/qspinlock: Introduce CNA into the slow path of qspinlock

[Peter Zijlstra]

On Thu, Apr 04, 2019 at 07:05:24AM +0200, Juergen Gross wrote:

> Without PARAVIRT_SPINLOCK this would be just an alternative() then?

That could maybe work yes. This is all early enough.

> Maybe the resulting code would be much more readable if we'd just
> make PARAVIRT_SPINLOCK usable without the other PARAVIRT hooks? So
> splitting up PARAVIRT into PARAVIRT_GUEST (timer hooks et al) and
> the patching infrastructure, with PARAVIRT_GUEST and PARAVIRT_SPINLOCK
> selecting PARAVIRT, and PARAVIRT_XXL selecting PARAVIRT_GUEST.

Well, ideally we'll get static_call() sorted and use that.