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

Oliver Neukum
2013-09-27T23:40:35Z

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.

Regards
Oliver