powerpc: fix pgtable pmd cache init

[Michael Ellerman]

On Tue, 2017-01-03 at 15:55:17 UTC, Nicholas Piggin wrote:
> Commit 9b081e10805cd ("powerpc: port 64 bits pgtable_cache to 32 bits")
> mixed up PMD_INDEX_SIZE and PMD_CACHE_INDEX a couple of times. This
> resulted in 64s/hash/4k configs to panic at boot with a false positive
> error check.
> 
> Fix that and simplify error handling by moving the check to the caller.
> 
> Fixes: 9b081e10805cd ("powerpc: port 64 bits pgtable_cache to 32 bits")
> Cc: Christophe Leroy <christophe.leroy at c-s.fr>
> Cc: Aneesh Kumar K.V <aneesh.kumar at linux.vnet.ibm.com>
> Cc: Scott Wood <oss at buserror.net>
> Cc: linuxppc-dev at lists.ozlabs.org
> Signed-off-by: Nicholas Piggin <npiggin at gmail.com>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/bf5ca68dd2eef59a936969e802d811

cheers