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Commit 93afe0b7 authored by Jeremy Fitzhardinge's avatar Jeremy Fitzhardinge
Browse files

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: default avatarJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
parent e3cc067b

drivers/xen/evtchn.c

+8 −2
Original line number Diff line number Diff line
@@ -73,7 +73,7 @@ struct per_user_data { 
 * 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 @@ static int __init evtchn_init(void) 
	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 int __init evtchn_init(void) 


static void __exit evtchn_cleanup(void)

{

	kfree(port_user);

	port_user = NULL;



	misc_deregister(&evtchn_miscdev);

}