Comment # 2 on bug 74539 from Marek Olšák

(In reply to comment #1)
> It looks like the first bad commit is this one:
> 
> commit ed42e95404a51298ea878a0d1cdcbc473612706a
> Author: Marek Olšák <marek.olsak@amd.com>
> Date:   Wed Jan 22 02:49:53 2014 +0100
> 
>     r600g,radeonsi: consolidate remaining obviously duplicated pipe_screen
> code

I don't think this is it. These functions are called once per process.