[RFC PATCH 2/2] arm: mm: Double logical invert for LPAE pte_write(), pte_dirty()

[Will Deacon]

On Fri, Feb 14, 2014 at 04:55:13PM +0000, Steve Capper wrote:
> On LPAE, L_PTE_WRITE and L_PTE_DIRTY are in the upper 32-bits.
> Unfortunately, results from pte_write() and pte_dirty() are downcast
> to 32-bits by core code:
>   o gather_stats
>   o huge_pte_dirty
>   o huge_pte_write
>   o make_migration_entry
> 
> This patch adds a double logical invert to pte_write() and pte_dirty()
> for LPAE to ensure that the lower 32-bits are set if true.

Yikes, this sounds like something we should put in -stable, no? If so,
better make it patch 1 of this series.

  Reviewed-by: Will Deacon <will.deacon at arm.com>

Will