From f45c40a92d2c6915a0e88ff8a947095be2ba1c8e Mon Sep 17 00:00:00 2001
From: Sam Bradshaw <sbradshaw@micron.com>
Date: Fri, 6 Jun 2014 13:28:48 -0600
Subject: [PATCH] mtip32xx: minor performance enhancements

This patch adds the following:

1) Compiler hinting in the fast path.
2) A prefetch of port->flags to eliminate moderate cpu stalling later
in mtip_hw_submit_io().
3) Eliminate a redundant rq_data_dir().
4) Reorder members of driver_data to eliminate false cacheline sharing
between irq_workers_active and unal_qdepth.

With some workload and topology configurations, I'm seeing ~1.5%
throughput improvement in small block random read benchmarks as well
as improved latency std. dev.

Signed-off-by: Sam Bradshaw <sbradshaw@micron.com>

Add include of <linux/prefetch.h>

Signed-off-by: Jens Axboe <axboe@fb.com>
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