From: Chris Metcalf <cmetcalf@tilera.com>
Date: Wed, 28 Mar 2012 17:59:18 +0000 (-0400)
Subject: arch/tile: allow building Linux with transparent huge pages enabled
X-Git-Tag: v3.5-rc1~76^2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=73636b1aacb1a07e6fbe0d25e560e69b024a8e25;p=pandora-kernel.git

arch/tile: allow building Linux with transparent huge pages enabled

The change adds some infrastructure for managing tile pmd's more generally,
using pte_pmd() and pmd_pte() methods to translate pmd values to and
from ptes, since on TILEPro a pmd is really just a nested structure
holding a pgd (aka pte).  Several existing pmd methods are moved into
this framework, and a whole raft of additional pmd accessors are defined
that are used by the transparent hugepage framework.

The tile PTE now has a "client2" bit.  The bit is used to indicate a
transparent huge page is in the process of being split into subpages.

This change also fixes a generic bug where the return value of the
generic pmdp_splitting_flush() was incorrect.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
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