From: 黄涛 <huangtao@rock-chips.com>
Date: Sat, 30 Jul 2011 14:16:32 +0000 (+0800)
Subject: Revert "sched: Add a generic notifier when a task struct is about to be freed"
X-Git-Tag: firefly_0821_release~10020
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=496721f1c23ea3423f05dcac554e90a70dddd172;p=firefly-linux-kernel-4.4.55.git

Revert "sched: Add a generic notifier when a task struct is about to be freed"

This reverts commit 9e6cb2f4dbe36af72558f60f418cc03df0173628.
---

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 30473ee9628b..e48311e8c923 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1724,9 +1724,6 @@ extern cputime_t task_utime(struct task_struct *p);
 extern cputime_t task_stime(struct task_struct *p);
 extern cputime_t task_gtime(struct task_struct *p);
 
-extern int task_free_register(struct notifier_block *n);
-extern int task_free_unregister(struct notifier_block *n);
-
 /*
  * Per process flags
  */
diff --git a/kernel/fork.c b/kernel/fork.c
index 2cfa6dcfd44f..166b8c49257c 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -138,9 +138,6 @@ struct kmem_cache *vm_area_cachep;
 /* SLAB cache for mm_struct structures (tsk->mm) */
 static struct kmem_cache *mm_cachep;
 
-/* Notifier list called when a task struct is freed */
-static ATOMIC_NOTIFIER_HEAD(task_free_notifier);
-
 static void account_kernel_stack(struct thread_info *ti, int account)
 {
 	struct zone *zone = page_zone(virt_to_page(ti));
@@ -159,18 +156,6 @@ void free_task(struct task_struct *tsk)
 }
 EXPORT_SYMBOL(free_task);
 
-int task_free_register(struct notifier_block *n)
-{
-	return atomic_notifier_chain_register(&task_free_notifier, n);
-}
-EXPORT_SYMBOL(task_free_register);
-
-int task_free_unregister(struct notifier_block *n)
-{
-	return atomic_notifier_chain_unregister(&task_free_notifier, n);
-}
-EXPORT_SYMBOL(task_free_unregister);
-
 void __put_task_struct(struct task_struct *tsk)
 {
 	WARN_ON(!tsk->exit_state);
@@ -180,7 +165,6 @@ void __put_task_struct(struct task_struct *tsk)
 	exit_creds(tsk);
 	delayacct_tsk_free(tsk);
 
-	atomic_notifier_call_chain(&task_free_notifier, 0, tsk);
 	if (!profile_handoff_task(tsk))
 		free_task(tsk);
 }