[PATCH v3 1/3] powerpc: port 64 bits pgtable_cache to 32 bits

[Aneesh Kumar K.V]

Christophe Leroy <christophe.leroy at c-s.fr> writes:

> Today powerpc64 uses a set of pgtable_caches while powerpc32 uses
> standard pages when using 4k pages and a single pgtable_cache
> if using other size pages.
>
> In preparation of implementing huge pages on the 8xx, this patch
> replaces the specific powerpc32 handling by the 64 bits approach.
>
> This is done by:
> * moving 64 bits pgtable_cache_add() and pgtable_cache_init()
> in a new file called init-common.c
> * modifying pgtable_cache_init() to also handle the case
> without PMD
> * removing the 32 bits version of pgtable_cache_add() and
> pgtable_cache_init()
> * copying related header contents from 64 bits into both the
> book3s/32 and nohash/32 header files
>
> On the 8xx, the following cache sizes will be used:
> * 4k pages mode:
> - PGT_CACHE(10) for PGD
> - PGT_CACHE(3) for 512k hugepage tables
> * 16k pages mode:
> - PGT_CACHE(6) for PGD
> - PGT_CACHE(7) for 512k hugepage tables
> - PGT_CACHE(3) for 8M hugepage tables
>

Reviewed-by: Aneesh Kumar K.V <aneesh.kumar at linux.vnet.ibm.com>

> Signed-off-by: Christophe Leroy <christophe.leroy at c-s.fr>
> ---

-aneesh