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xen/evtchn: dynamically allocate port_user array

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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>
This commit is contained in:
Jeremy Fitzhardinge 2009-09-18 16:36:58 -07:00
parent e3cc067b0a
commit 93afe0b75e
1 changed files with 8 additions and 2 deletions
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10
drivers/xen/evtchn.c
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@ -73,7 +73,7 @@ struct per_user_data {
* Who's bound to each port? This is logically an array of struct * 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. * 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 DEFINE_SPINLOCK(port_user_lock); /* protects port_user[] and ring_prod */
static inline struct per_user_data *get_port_user(unsigned port) static inline struct per_user_data *get_port_user(unsigned port)
@ -522,8 +522,11 @@ static int __init evtchn_init(void)
if (!xen_domain()) if (!xen_domain())
return -ENODEV; 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); spin_lock_init(&port_user_lock);
memset(port_user, 0, sizeof(port_user));
/* Create '/dev/misc/evtchn'. */ /* Create '/dev/misc/evtchn'. */
err = misc_register(&evtchn_miscdev); err = misc_register(&evtchn_miscdev);
@ -539,6 +542,9 @@ static int __init evtchn_init(void)
static void __exit evtchn_cleanup(void) static void __exit evtchn_cleanup(void)
{ {
kfree(port_user);
port_user = NULL;
misc_deregister(&evtchn_miscdev); misc_deregister(&evtchn_miscdev);
} }