[PATCH v2 1/4] ARM: mm: correct pte_same behaviour for LPAE.

[Catalin Marinas]

On Thu, May 23, 2013 at 04:31:17PM +0100, Steve Capper wrote:
> For 3 levels of paging the PTE_EXT_NG bit will be set for user
> address ptes that are written to a page table but not for ptes
> created with mk_pte.
> 
> This can cause some comparison tests made by pte_same to fail
> spuriously and lead to other problems.
> 
> To correct this behaviour, we mask off PTE_EXT_NG for any pte that
> is present before running the comparison.
> 
> Signed-off-by: Steve Capper <steve.capper at linaro.org>
> Reviewed-by: Will Deacon <will.deacon at arm.com>

Reviewed-by: Catalin Marinas <catalin.marinas at arm.com>