From 4b570521be54666e6ad7e5f47af92fd609fbd8b5 Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@fb.com>
Date: Thu, 29 May 2014 11:00:11 -0600
Subject: [PATCH] blk-mq: request initialization optimizations

We currently clear a lot more than we need to, so make that a bit
more clever. Make some of the init dependent on features, like
only setting start_time if we are going to use it.

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