From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Wed, 9 Apr 2014 07:42:58 +0000 (+0200)
Subject: s390/uaccess: fix possible register corruption in strnlen_user_srst()
X-Git-Tag: omap-for-v3.16/pm-signed~104^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fa255f51c95fd91b4d7bb50a0fdcca18dd47db21;p=pandora-kernel.git

s390/uaccess: fix possible register corruption in strnlen_user_srst()

The whole point of the out-of-line strnlen_user_srst() function was to
avoid corruption of register 0 due to register asm assignment.
However 'somebody' :) forgot to remove the update_primary_asce() function
call, which may clobber register 0 contents.
So let's remove that call and also move the size check to the calling
function.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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