On Thu, Sep 14, 2017 at 06:11:32PM +1000, Benjamin Herrenschmidt wrote:

On Thu, 2017-09-14 at 14:38 +1000, Balbir Singh wrote:

quoted

On Fri,  8 Sep 2017 15:44:50 -0700
Ram Pai [off-list ref] wrote:

quoted

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 <redacted>
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"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.

(hmm.. this mail did not land in my mailbox :( Sorry for the delay. Just
saw it in the mailing list.)

I think this is good idea. I can code it such a way that we
support 16 or 32 keys depending on the availability of the vma bit.

No more hunks in the code.


RP