[PATCH -V5 09/25] powerpc: Fix hpte_decode to use the correct decoding for page sizes

[David Gibson]

On Thu, Apr 04, 2013 at 11:27:47AM +0530, Aneesh Kumar K.V wrote:
> From: "Aneesh Kumar K.V" <aneesh.kumar at linux.vnet.ibm.com>
> 
> As per ISA doc, we encode base and actual page size in the LP bits of
> PTE. The number of bit used to encode the page sizes depend on actual
> page size.  ISA doc lists this as
> 
>    PTE LP     actual page size
> rrrr rrrz 	>=8KB
> rrrr rrzz	>=16KB
> rrrr rzzz 	>=32KB
> rrrr zzzz 	>=64KB
> rrrz zzzz 	>=128KB
> rrzz zzzz 	>=256KB
> rzzz zzzz	>=512KB
> zzzz zzzz 	>=1MB
> 
> ISA doc also says
> "The values of the “z” bits used to specify each size, along with all possible
> values of “r” bits in the LP field, must result in LP values distinct from
> other LP values for other sizes."
> 
> based on the above update hpte_decode to use the correct decoding for LP bits.
> 
> Acked-by: Paul Mackerras <paulus at samba.org>
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar at linux.vnet.ibm.com>

Reviewed-by: David Gibson <david at gibson.dropbear.id.au>
-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson
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