[PATCH 05/11] Task watchers: Allow task watchers to block

[Matt Helsley <matthltc@us.ibm.com>]

This patch switches task_watchers to from atomic to blocking notifier chains,
allowing notifier_calls to sleep.

Signed-off-by: Matt Helsley <matthltc@us.ibm.com>
--

 drivers/connector/cn_proc.c |    2 +-
 kernel/sys.c                |    8 ++++----
 2 files changed, 5 insertions(+), 5 deletions(-)

Index: linux-2.6.17-rc6-mm2/kernel/sys.c
===================================================================
--- linux-2.6.17-rc6-mm2.orig/kernel/sys.c
+++ linux-2.6.17-rc6-mm2/kernel/sys.c
@@ -434,29 +434,29 @@ int unregister_reboot_notifier(struct no
 }
 
 EXPORT_SYMBOL(unregister_reboot_notifier);
 
 /* task watchers notifier chain */
-static ATOMIC_NOTIFIER_HEAD(task_watchers);
+static BLOCKING_NOTIFIER_HEAD(task_watchers);
 
 int register_task_watcher(struct notifier_block *nb)
 {
-	return atomic_notifier_chain_register(&task_watchers, nb);
+	return blocking_notifier_chain_register(&task_watchers, nb);
 }
 
 EXPORT_SYMBOL_GPL(register_task_watcher);
 
 int unregister_task_watcher(struct notifier_block *nb)
 {
-	return atomic_notifier_chain_unregister(&task_watchers, nb);
+	return blocking_notifier_chain_unregister(&task_watchers, nb);
 }
 
 EXPORT_SYMBOL_GPL(unregister_task_watcher);
 
 int notify_watchers(unsigned long val, void *v)
 {
-	return atomic_notifier_call_chain(&task_watchers, val, v);
+	return blocking_notifier_call_chain(&task_watchers, val, v);
 }
 

 static int set_one_prio(struct task_struct *p, int niceval, int error)
 {
Index: linux-2.6.17-rc6-mm2/drivers/connector/cn_proc.c
===================================================================
--- linux-2.6.17-rc6-mm2.orig/drivers/connector/cn_proc.c
+++ linux-2.6.17-rc6-mm2/drivers/connector/cn_proc.c
@@ -193,11 +193,11 @@ static int cn_proc_watch_task(struct not
 	get_seq(&msg->seq, &ev->cpu);
 	ktime_get_ts(&ev->timestamp); /* get high res monotonic timestamp */
 	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
 	msg->ack = 0; /* not used */
 	msg->len = sizeof(*ev);
-	cn_netlink_send(msg, CN_IDX_PROC, GFP_ATOMIC);
+	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
 	/* If cn_netlink_send() fails, drop data */
 	return rc;
 }
 
 static struct notifier_block __read_mostly cn_proc_nb = {

--