[v3] powerpc/mm: add exec protection on powerpc 603

[Michael Ellerman]

On Wed, 2018-11-28 at 17:21:10 UTC, Christophe Leroy wrote:
> The 603 doesn't have a HASH table, TLB misses are handled by
> software. It is then possible to generate page fault when
> _PAGE_EXEC is not set like in nohash/32.
> 
> There is one "reserved" PTE bit available, this patch uses
> it for _PAGE_EXEC.
> 
> In order to support it, set_pte_filter() and
> set_access_flags_filter() are made common, and the handling
> is made dependent on MMU_FTR_HPTE_TABLE
> 
> Signed-off-by: Christophe Leroy <christophe.leroy at c-s.fr>
> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar at linux.ibm.com>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/385e89d5b20f5a7c33fd7c1904da0e

cheers