From 99ba2ae4cd876bbcedb01d94c1a7952ce171418e Mon Sep 17 00:00:00 2001
From: Joe Thornber <ejt@redhat.com>
Date: Mon, 21 Oct 2013 11:44:57 +0100
Subject: [PATCH] dm cache policy mq: protect residency method with existing
 mutex

It is safe to use a mutex in mq_residency() at this point since it is
only called from ioctl context.  But future-proof mq_residency() by
using might_sleep() to catch new contexts that cannot sleep.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
---
Reading git-format-patch failed