lkml.org 
[lkml]   [2006]   [Sep]   [8]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
DateFri, 8 Sep 2006 20:54:08 -0700 (PDT)
FromLinus Torvalds <>
SubjectRe: Opinion on ordering of writel vs. stores to RAM

On Sat, 9 Sep 2006, Paul Mackerras wrote:
> > 
> > although it's quite possible that (a) never makes any sense at all.
> 
> Do you mean (b) never makes sense?

Yes.

> I suspect the best thing at this point is to move the sync in writeX()
> before the store, as you suggest, and add an "eieio" before the load
> in readX().  That does mean that we are then relying on driver writers
> putting in the mmiowb() between a writeX() and a spin_unlock, but at
> least that is documented.

Yeah, that sounds reasonable.

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

\
 
 \ /
  Last update: 2006-09-09 03:57    [from the cache]
©2003-2008