From 7085a655b8d665b6314e8dab2f803bac0aea04ec 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 df3e1a44707a..15c9d6e2e1e0 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 623be3174fb3..4ddd74ae0bb9 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