From: Anton Blanchard <anton@samba.org>
Date: Tue, 16 Sep 2014 00:49:14 +0000 (+1000)
Subject: powerpc: Use CONFIG_ARCH_HAS_FAST_MULTIPLIER
X-Git-Tag: fixes-against-v3.18-rc2~117^2~78
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=423216ed3273dae18c347ce52c5ecc193cfdd4e5;p=pandora-kernel.git

powerpc: Use CONFIG_ARCH_HAS_FAST_MULTIPLIER

I ran some tests to compare hash_64 using shifts and multiplies.
The results:

POWER6:	~2x slower
POWER7: ~2x faster
POWER8: ~2x faster

Now we have a proper config option, select
CONFIG_ARCH_HAS_FAST_MULTIPLIER on POWER7 and POWER8.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---

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