[linux-fbdev] Re: Fwd: Re: still no accelerated X ($#!$*)

[anthony tong]

Benjamin Herrenschmidt (Fri, Jan 21, 2000 at 03:15:11PM +0100):
> On Thu, Jan 20, 2000, Kevin Hendricks <khendricks at ivey.uwo.ca> wrote:
> >Okay, I went and looked at the latest aty128fb.c code and it does not use
> >eieio
> >anywhere.  I looked at ealier verions of this file and it at one time had
> >eieio
> >but they have since been removed.
> >
> >I also looked and the endian conversion routines do not use the output
> >contraint approach you took but do include the memory clobber on the writes.
>
> I just looked at atyfb.c and aty128fb.c in my source tree (atyfb is
> 2.2.14 one and aty128fb is the latest backport done by atong) and neither
> uses eieio nor mb(), wmb(), ...
>
> This looks bogus to me. I've spotted a few cases where those calls should
> be in.
>
> We can either put the eieio back in the access functions (less optimal,
> but we can also fix the constraints to get rid of the memory clobber as
> discussed previously), or we can fill the code with carefuly placed mb()
> and wmb() but this requires more knowledge of the chipset than I actually
> have.
>
> I'll put back eieio() in the access macros for my kernels until a
> definitive answer pops up on this issue.

I must have missed when these were taken out; does anyone know the reason
why it was done?


** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/