On Tue, 2015-04-28 at 10:50 -0700, Jason Low wrote:
> On Tue, 2015-04-28 at 19:17 +0200, Peter Zijlstra wrote:
>
> > To me it makes more sense to reverse these two branches (identical code
> > wise of course) and put the special case first.
> >
> > Alternatively we could also do something like the below, which to my
> > eyes looks a little better still, but I don't care too much.
> >
> > if (rwsem_has_spinner(sem)) {
> > /*
> > * comment ...
> > */
> > smp_rmb();
> > if (!raw_spin_trylock_irqsave(&sem->wait_lock, flags))
> > return sem;
> > goto locked;
> > }
> >
> > raw_spin_lock_irqsave(&sem->wait_lock, flags);
> > locked:
>
> How about putting this into its own function:
I'd actually prefer reusing the current function. We have so many
utility functions that we've over-encapsulated the code a bit, it makes
reading _harder_, imho.
Thanks,
Davidlohr
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