From: Joonwoo Park <joonwoop@codeaurora.org>
Date: Tue, 21 Oct 2014 00:59:03 +0000 (+0100)
Subject: arm64: optimize memcpy_{from,to}io() and memset_io()
X-Git-Tag: omap-for-v3.19/fixes-for-merge-window~18^2~58
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=70ddb63a88bfd45eb6abe36e2bf4f8f351a447d7;p=pandora-kernel.git

arm64: optimize memcpy_{from,to}io() and memset_io()

Optimize memcpy_{from,to}io() and memset_io() by transferring in 64 bit
as much as possible with minimized barrier usage.  This simplest
optimization brings faster throughput compare to current byte-by-byte read
and write with barrier in the loop.  Code's skeleton is taken from the
powerpc.

Link: http://lkml.kernel.org/p/20141020133304.GH23751@e104818-lin.cambridge.arm.com
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Trilok Soni <tsoni@codeaurora.org>
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
---

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