Re: [RFC][PATCH 5/7] jump_label: Rework update logic

[Heiko Carstens]

On Mon, Jul 27, 2015 at 06:30:05PM +0200, Peter Zijlstra wrote:
> On Mon, Jul 27, 2015 at 12:47:14PM +0200, Peter Zijlstra wrote:
> > @@ -68,13 +63,8 @@ void static_key_slow_inc(struct static_k
> >  		return;
> >  
> >  	jump_label_lock();
> > +	if (atomic_inc_and_test(&key->enabled))
> 
> atomic_inc_return() == 1, works _much_ better.

Confirmed. With this change, the jump_label_init() patch, plus the
changes in s390 inline asm everything works for me.

There are a couple of places in s390 code where the DEFINE_STATIC_KEY_FALSE
and static_branch_likely() combination would make sense.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/