[PATCH 02/25] powerpc: define an additional vma bit for protection keys.

[Benjamin Herrenschmidt]

On Thu, 2017-09-14 at 14:38 +1000, Balbir Singh wrote:
> On Fri,  8 Sep 2017 15:44:50 -0700
> Ram Pai <linuxram at us.ibm.com> wrote:
> 
> > powerpc needs an additional vma bit to support 32 keys.
> > Till the additional vma bit lands in include/linux/mm.h
> > we have to define  it  in powerpc specific header file.
> > This is  needed to get pkeys working on power.
> > 
> > Signed-off-by: Ram Pai <linuxram at us.ibm.com>
> > ---
> 
> "This" being an arch specific hack for the additional bit?

Arch VMA bits ? really ? I'd rather we limit ourselves to 16 keys first
then push for adding the extra bit to the generic code.

Ben.