complete boot failure in 4.5-rc1 caused by nvme: make SG_IO support optional

[hch@lst.de (Christoph Hellwig)]

Updated version below:

---
>From d63251560cf2670badbc86c83502502f29c087e0 Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@lst.de>
Date: Tue, 9 Feb 2016 18:11:32 +0100
Subject: nvme: fix Kconfig description for BLK_DEV_NVME_SCSI

Signed-off-by: Christoph Hellwig <hch at lst.de>
---
 drivers/nvme/host/Kconfig | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/nvme/host/Kconfig b/drivers/nvme/host/Kconfig
index 59307f8..68fa858 100644
--- a/drivers/nvme/host/Kconfig
+++ b/drivers/nvme/host/Kconfig
@@ -17,8 +17,9 @@ config BLK_DEV_NVME_SCSI
 	  and block devices nodes, as well a a translation for a small
 	  number of selected SCSI commands to NVMe commands to the NVMe
 	  driver.  If you don't know what this means you probably want
-	  to say N here, and if you know what it means you probably
-	  want to say N as well.
+	  to say N here, unless you run a distro that abuses the SCSI
+	  emulation to provide stable device names for mount by id like
+	  some OpenSuSE and SLES versions.
 
 config NVME_FABRICS
 	tristate
-- 
2.1.4