Re: [PATCH] checkpatch: Make the memory barrier test noisier

Peter Zijlstra
2013-09-28T07:54:43Z

On Sat, Sep 28, 2013 at 01:40:27AM +0200, Oliver Neukum wrote:
> On Fri, 2013-09-27 at 16:50 +0200, Peter Zijlstra wrote:
> > On Fri, Sep 27, 2013 at 07:34:55AM -0700, Joe Perches wrote:
> > > That would make it seem as if all barriers are SMP no?
> >
> > I would think any memory barrier is ordering against someone else; if
> > not smp then a device/hardware -- like for instance the hardware page
> > table walker.
> >
> > Barriers are fundamentally about order; and order only makes sense if
> > there's more than 1 party to the game.
>
> But not necessarily more than 1 kind of parties. It is perfectly
> possible to have a barrier against other threads running the same
> function.

Then that makes a good comment ;-)