From: John David Anglin <dave.anglin@bell.net>
Date: Tue, 15 Jan 2013 00:45:00 +0000 (-0500)
Subject: [PARISC] Purge existing TLB entries in set_pte_at and ptep_set_wrprotect
X-Git-Tag: v3.9-rc1~102^2~29^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7139bc1579901b53db7e898789e916ee2fb52d78;p=pandora-kernel.git

[PARISC] Purge existing TLB entries in set_pte_at and ptep_set_wrprotect

This patch goes a long way toward fixing the minifail bug, and
it  significantly improves the stability of SMP machines such as
the rp3440.  When write  protecting a page for COW, we need to
purge the existing translation.  Otherwise, the COW break
doesn't occur as expected because the TLB may still have a stale entry
which allows writes.

[jejb: fix up checkpatch errors]
Signed-off-by: John David Anglin <dave.anglin@bell.net>
Cc: stable@vger.kernel.org
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
---

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