xen/evtchn: dynamically allocate port_user array
We only need the array when running as a Xen domain, so dynamically
allocate it as needed to save on bss space.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
diff --git a/drivers/xen/evtchn.c b/drivers/xen/evtchn.c
index 4356a9a..709c32d 100644
--- a/drivers/xen/evtchn.c
+++ b/drivers/xen/evtchn.c
@@ -73,7 +73,7 @@
* Who's bound to each port? This is logically an array of struct
* per_user_data *, but we encode the current enabled-state in bit 0.
*/
-static unsigned long port_user[NR_EVENT_CHANNELS];
+static unsigned long *port_user;
static DEFINE_SPINLOCK(port_user_lock); /* protects port_user[] and ring_prod */
static inline struct per_user_data *get_port_user(unsigned port)
@@ -522,8 +522,11 @@
if (!xen_domain())
return -ENODEV;
+ port_user = kcalloc(NR_EVENT_CHANNELS, sizeof(*port_user), GFP_KERNEL);
+ if (port_user == NULL)
+ return -ENOMEM;
+
spin_lock_init(&port_user_lock);
- memset(port_user, 0, sizeof(port_user));
/* Create '/dev/misc/evtchn'. */
err = misc_register(&evtchn_miscdev);
@@ -539,6 +542,9 @@
static void __exit evtchn_cleanup(void)
{
+ kfree(port_user);
+ port_user = NULL;
+
misc_deregister(&evtchn_miscdev);
}