From: Fenghua Yu <fenghua.yu@intel.com>
Date: Sat, 16 Nov 2013 20:37:01 +0000 (-0800)
Subject: x86-64, copy_user: Remove zero byte check before copy user buffer.
X-Git-Tag: v3.14-rc1~167^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f4cb1cc18f364d761d5614eb6293cccc6647f259;p=pandora-kernel.git

x86-64, copy_user: Remove zero byte check before copy user buffer.

Operation of rep movsb instruction handles zero byte copy. As pointed out by
Linus, there is no need to check zero size in kernel. Removing this redundant
check saves a few cycles in copy user functions.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Link: http://lkml.kernel.org/r/1384634221-6006-1-git-send-email-fenghua.yu@intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
---

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