Re: [Linux-fbdev-devel] Re: [PATCH] fbdev: Fix IO access in rivafb

From: Giuseppe Bilotta
Date: Mon Nov 08 2004 - 18:13:34 EST

Benjamin Herrenschmidt wrote:
> On Mon, 2004-11-08 at 17:06 +0800, Antonino A. Daplas wrote:
> >
> > How about this patch? This is almost the original macro in riva_hw.h,
> > with the __force annotation.
> I don't like it neither. It lacks barriers. the rivafb driver
> notoriously lacks barriers, except in a few places where it was so bad
> that it actually broke all the time, where we added some. This
> originates from the X "nv" driver written by Mark Vojkovich who didn't
> want to hear about barriers for perfs reasons I think.

Could this be the reason why in 2.6.7 I get solid lockups when
switching to nv-driven X and rivafb-driven console? Is there
something I could test to see if this is the reason?

Giuseppe "Oblomov" Bilotta

Can't you see
It all makes perfect sense
Expressed in dollar and cents
Pounds shillings and pence
(Roger Waters)

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