[PATCH] xen/pvcalls: Add MODULE_LICENSE()

[Boris Ostrovsky <boris.ostrovsky@oracle.com>]

Since commit ba1029c9cbc5 ("modpost: detect modules without a
MODULE_LICENSE") modules without said macro will generate

WARNING: modpost: missing MODULE_LICENSE() in <filename>

While at it, also add module description and attribution.

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
---
 drivers/xen/pvcalls-back.c  | 4 ++++
 drivers/xen/pvcalls-front.c | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/drivers/xen/pvcalls-back.c b/drivers/xen/pvcalls-back.c
index b209cd4..02cd33c 100644
--- a/drivers/xen/pvcalls-back.c
+++ b/drivers/xen/pvcalls-back.c
@@ -1238,3 +1238,7 @@ static void __exit pvcalls_back_fin(void)
 }
 
 module_exit(pvcalls_back_fin);
+
+MODULE_DESCRIPTION("Xen PV Calls backend driver");
+MODULE_AUTHOR("Stefano Stabellini <sstabellini@kernel.org>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/xen/pvcalls-front.c b/drivers/xen/pvcalls-front.c
index 2925b2f..9e40c2c 100644
--- a/drivers/xen/pvcalls-front.c
+++ b/drivers/xen/pvcalls-front.c
@@ -1273,3 +1273,7 @@ static int __init pvcalls_frontend_init(void)
 }
 
 module_init(pvcalls_frontend_init);
+
+MODULE_DESCRIPTION("Xen PV Calls frontend driver");
+MODULE_AUTHOR("Stefano Stabellini <sstabellini@kernel.org>");
+MODULE_LICENSE("GPL");
-- 
2.7.5