Re: [PATCH 26/30] loongson: flush irq write operation

[yanh <yanh@lemote.com>]

在 2009-05-20三的 08:07 +0100，Ralf Baechle写道：
> On Wed, May 20, 2009 at 10:28:14AM +0800, yanh wrote:
> 
> > I have test this patch just now. It works well on yeeloong. 
> 
> Thanks for testing.
> 
> > I have one question what's the difference between the two patch? 
> 
> Uncached writes can't be re-ordered.  By adding a read after the last
> write my patch forces not only completion of the preceding write but due
> to this ordering constraint also completion of all preceding writes is
> enforced.
> 
> I/O space writes are slow.  I mean slower than slugs in space.  So my
> patch is an optimization but that was not the point; I really only meant
> to verify that we understood what's going on and we seem to.  Now let's
> fix the real issue and make outX() non-posted.
Thanks for your explanation. 
> 
>   Ralf
>