On Fri, Jun 26, 2015 at 4:54 PM, Benjamin Herrenschmidt
[off-list ref] wrote:

On Fri, 2015-06-26 at 15:41 -0700, Luis R. Rodriguez wrote:

quoted

quoted

It wasn't nullified for the main user at the time, the fb. And I
mentioned an IB adapter or two for which the code had been hand

tuned.

This still means there could be some affected drivers when used on
powerpc, no?

Yes. In fact what about things like ARM who also have barriers in their
writel() ? Won't they also break WC ?

Not sure if they have that write-combine notion on their CPUs /
interconnects. Russel, Stefano, does ARM have write-combining ?

 Luis