[PATH V2 2/6] arm: mm: Introduce special ptes for LPAE

[Steve Capper]

On Wed, Aug 27, 2014 at 11:46:53AM +0100, Catalin Marinas wrote:
> On Thu, Aug 21, 2014 at 04:43:28PM +0100, Steve Capper wrote:
> > We need a mechanism to tag ptes as being special, this indicates that
> > no attempt should be made to access the underlying struct page *
> > associated with the pte. This is used by the fast_gup when operating on
> > ptes as it has no means to access VMAs (that also contain this
> > information) locklessly.
> > 
> > The L_PTE_SPECIAL bit is already allocated for LPAE, this patch modifies
> > pte_special and pte_mkspecial to make use of it, and defines
> > __HAVE_ARCH_PTE_SPECIAL.
> > 
> > This patch also excludes special ptes from the icache/dcache sync logic.
> > 
> > Signed-off-by: Steve Capper <steve.capper at linaro.org>
> 
> Reviewed-by: Catalin Marinas <catalin.marinas at arm.com>

Thanks Catalin,
I've added this to the patch.
-- 
Steve

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