[PATCH v4] powerpc 8xx: Fixing issue with CONFIG_PIN_TLB

[Scott Wood]

On Tue, 2013-09-24 at 10:18 +0200, Christophe Leroy wrote:
> Activating CONFIG_PIN_TLB is supposed to pin the IMMR and the first three
> 8Mbytes pages. But the setting of MD_CTR to a pinnable entry was missing before
> the pinning of the third 8Mb page. As the index is decremented module 28
> (MD_RSV4D is set) after every DTLB update, the third 8Mbytes page was
> not pinned.

The examples you showed weren't quite modulo 28, more like "if (x >= 28)
x -= 4".  I'll fix up the changelog on applying, to read something like
"As the index is decremented to a value within the first 28 entries
(MD_RSV4D is set)...".

-Scott