From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Wed, 20 Feb 2013 12:59:26 +0000 (+0100)
Subject: s390/uaccess: shorten strncpy_from_user/strnlen_user
X-Git-Tag: v3.9-rc1~5^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d7b788cd06a3080ebf0b2f5f2e008d4fda2b336e;p=pandora-kernel.git

s390/uaccess: shorten strncpy_from_user/strnlen_user

Always stay within page boundaries when copying from user within
strlen_user_mvcos()/strncpy_from_user_mvcos(). This allows to
shorten the code a bit and may prevent unnecessary faults, since
we copy quite large amounts of memory to kernel space.

Also directly call the mvcos variants of copy_from_user() to
avoid indirect branches.

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