xen: Remove some deadcode (x)

Remove three uncalled functions:

xenbus_mkdir() was added in 2007 by
commit 4bac07c993d0 ("xen: add the Xenbus sysfs and virtual device hotplug
driver")
but has remained unused.

xen_get_runstate_snapshot() last use was removed in 2016 by
commit 6ba286ad8457 ("xen: support runqueue steal time on xen")
which replaces the use by the _cpu version.

xen_resume_notifier_unregister() last use was removed in 2017 by
commit 1914f0cd203c ("xen/acpi: upload PM state from init-domain to Xen")

Remove them.

Signed-off-by: "Dr. David Alan Gilbert" <[e-mail]>
Reviewed-by: Juergen Gross <[e-mail]>
Signed-off-by: Juergen Gross <[e-mail]>
Message-ID: <[e-mail]>

drivers/xen/manage.c

···
 }
 EXPORT_SYMBOL_GPL(xen_resume_notifier_register);
 
-void xen_resume_notifier_unregister(struct notifier_block *nb)
-{
-	raw_notifier_chain_unregister(&xen_resume_notifier, nb);
-}
-EXPORT_SYMBOL_GPL(xen_resume_notifier_unregister);
-
 #ifdef CONFIG_HIBERNATE_CALLBACKS
 static int xen_suspend(void *data)
 {

drivers/xen/time.c

···
 	}
 }
 
-/*
- * Runstate accounting
- */
-void xen_get_runstate_snapshot(struct vcpu_runstate_info *res)
-{
-	xen_get_runstate_snapshot_cpu(res, smp_processor_id());
-}
-
 /* return true when a vcpu could run but has no real cpu to run on */
 bool xen_vcpu_stolen(int vcpu)
 {

drivers/xen/xenbus/xenbus_xs.c

···
 }
 EXPORT_SYMBOL_GPL(xenbus_write);
 
-/* Create a new directory. */
-int xenbus_mkdir(struct xenbus_transaction t,
-		 const char *dir, const char *node)
-{
-	char *path;
-	int ret;
-
-	path = join(dir, node);
-	if (IS_ERR(path))
-		return PTR_ERR(path);
-
-	ret = xs_error(xs_single(t, XS_MKDIR, path, NULL));
-	kfree(path);
-	return ret;
-}
-EXPORT_SYMBOL_GPL(xenbus_mkdir);
-
 /* Destroy a file or directory (directories must be empty). */
 int xenbus_rm(struct xenbus_transaction t, const char *dir, const char *node)
 {

include/xen/xen-ops.h

···
 void xen_reboot(int reason);
 
 void xen_resume_notifier_register(struct notifier_block *nb);
-void xen_resume_notifier_unregister(struct notifier_block *nb);
 
 bool xen_vcpu_stolen(int vcpu);
 void xen_setup_runstate_info(int cpu);
 void xen_time_setup_guest(void);
 void xen_manage_runstate_time(int action);
-void xen_get_runstate_snapshot(struct vcpu_runstate_info *res);
 u64 xen_steal_clock(int cpu);
 
 int xen_setup_shutdown_event(void);

include/xen/xenbus.h

···
 		  const char *dir, const char *node, unsigned int *len);
 int xenbus_write(struct xenbus_transaction t,
 		 const char *dir, const char *node, const char *string);
-int xenbus_mkdir(struct xenbus_transaction t,
-		 const char *dir, const char *node);
 int xenbus_exists(struct xenbus_transaction t,
 		  const char *dir, const char *node);
 int xenbus_rm(struct xenbus_transaction t, const char *dir, const char *node);