From: Martin Schwidefsky <schwidefsky@de.ibm.com>
Date: Fri, 22 Nov 2013 14:14:23 +0000 (+0100)
Subject: s390/mm: handle asce-type exceptions as normal page fault
X-Git-Tag: v3.13-rc2~2^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=127581b64b432804948535d49847b36366b9ff64;p=pandora-kernel.git

s390/mm: handle asce-type exceptions as normal page fault

Git commit 9e34f2686bb088b211b6cac8772e1f644c6180f8
"s390/mm,tlb: tlb flush on page table upgrade fixup" removed the
exception handler for the asce-type exception. This is incorrect
as the user-copy with MVCOS can cause asce-type exceptions in
the kernel if a user pointer is too large. Those need to be
handled with do_no_context to branch to the fixup in the
user-copy code.

The simplest fix for this problem is to call do_dat_exception for
asce-type excpetions, as there is no vma for the address the code
will handle the exception correctly.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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