From: Christian Borntraeger <borntraeger@de.ibm.com>
Date: Mon, 27 May 2013 14:19:55 +0000 (+0200)
Subject: s390/pgtable: Fix check for pgste/storage key handling
X-Git-Tag: v3.10-rc5~35^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b56433cb782d1cc7e44fc46d2ce3917fa75d2236;p=pandora-kernel.git

s390/pgtable: Fix check for pgste/storage key handling

pte_present might return true on PAGE_TYPE_NONE, even if
the invalid bit is on. Modify the existing check of the
pgste functions to avoid crashes.

[ Martin Schwidefsky: added ptep_modify_prot_[start|commit] bits ]

Reported-by: Martin Schwidefky <schwidefsky@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
CC: stable@vger.kernel.org
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

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