USB mass storage and ARM cache coherency

[Oliver Neukum]

Am Mittwoch, 24. Februar 2010 22:12:34 schrieb Benjamin Herrenschmidt:
> On Wed, 2010-02-24 at 08:16 +0100, Oliver Neukum wrote:
> > I don't know. The issue seems quite complex. It would seem better to
> > centralize it as far as practical. Do you have a wrapper drivers could
> > call?
> 
> flush_dcache_page() ? :-)

Will this do anything on arches that don't need it?
Secondly, can we have a wrapper that you can pass a pointer and an
offset?
 
> Now, the subsystem might be the one to know whether something is mapped
> into userspace or not (v4l in our case) in which case a wrapper could be
> created.

If possible, I'd like to centralize this. Drivers are likely to get this wrong.

	Regards
		Oliver