From c63702554e54b992793fe3598ea8c8c415bef908 Mon Sep 17 00:00:00 2001
From: Julien Thierry <jthierry@redhat.com>
Date: Wed, 6 May 2020 14:30:57 +0100
Subject: [PATCH] Symbol version change

This change causes:
1) Some exported symbols in drivers/base/core.c to see their CRCs
   change.
2) Changes usb_get_dev() referencing a get_device() whose CRC has
   changed, causing the symbol and the new CRC to be included in the
   __version section of the final module.

This makes the final module unloadable for the target kernel.

See "Exported symbol versioning" of the patch author guide for more
detail.

---
 drivers/base/core.c    | 2 ++
 drivers/usb/core/usb.c | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 2ab316d85651..2ef19920f6ab 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -29,6 +29,8 @@
 #include "base.h"
 #include "power/power.h"
 
+#include <linux/blktrace_api.h>
+
 #ifdef CONFIG_SYSFS_DEPRECATED
 #ifdef CONFIG_SYSFS_DEPRECATED_V2
 long sysfs_deprecated = 1;
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index 0a2b261a27c9..51a1868c9cea 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -685,6 +685,8 @@ EXPORT_SYMBOL_GPL(usb_alloc_dev);
  */
 struct usb_device *usb_get_dev(struct usb_device *dev)
 {
+	barrier();
+
 	if (dev)
 		get_device(&dev->dev);
 	return dev;
-- 
2.21.3