---

yaml
---
r: 33756
b: refs/heads/master
c: 35df17c
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 30f3174d1c506db2c6d2c1dddc9c064e741d6b76
+refs/heads/master: 35df17c57cecb08f0120fb18926325f1093dc429

trunk/include/linux/delayacct.h

@@ -59,10 +59,14 @@ static inline void delayacct_tsk_init(struct task_struct *tsk)
 		__delayacct_tsk_init(tsk);
 }
 
-static inline void delayacct_tsk_exit(struct task_struct *tsk)
+/* Free tsk->delays. Called from bad fork and __put_task_struct
+ * where there's no risk of tsk->delays being accessed elsewhere
+ */
+static inline void delayacct_tsk_free(struct task_struct *tsk)
 {
 	if (tsk->delays)
-		__delayacct_tsk_exit(tsk);
+		kmem_cache_free(delayacct_cache, tsk->delays);
+	tsk->delays = NULL;
 }
 
 static inline void delayacct_blkio_start(void)
@@ -101,7 +105,7 @@ static inline void delayacct_init(void)
 {}
 static inline void delayacct_tsk_init(struct task_struct *tsk)
 {}
-static inline void delayacct_tsk_exit(struct task_struct *tsk)
+static inline void delayacct_tsk_free(struct task_struct *tsk)
 {}
 static inline void delayacct_blkio_start(void)
 {}

trunk/include/linux/sched.h

@@ -994,7 +994,6 @@ struct task_struct {
 	 */
 	struct pipe_inode_info *splice_pipe;
 #ifdef	CONFIG_TASK_DELAY_ACCT
-	spinlock_t delays_lock;
 	struct task_delay_info *delays;
 #endif
 };

trunk/kernel/delayacct.c

@@ -41,24 +41,11 @@ void delayacct_init(void)
 
 void __delayacct_tsk_init(struct task_struct *tsk)
 {
-	spin_lock_init(&tsk->delays_lock);
-	/* No need to acquire tsk->delays_lock for allocation here unless
-	   __delayacct_tsk_init called after tsk is attached to tasklist
-	*/
 	tsk->delays = kmem_cache_zalloc(delayacct_cache, SLAB_KERNEL);
 	if (tsk->delays)
 		spin_lock_init(&tsk->delays->lock);
 }
 
-void __delayacct_tsk_exit(struct task_struct *tsk)
-{
-	struct task_delay_info *delays = tsk->delays;
-	spin_lock(&tsk->delays_lock);
-	tsk->delays = NULL;
-	spin_unlock(&tsk->delays_lock);
-	kmem_cache_free(delayacct_cache, delays);
-}
-
 /*
  * Start accounting for a delay statistic using
  * its starting timestamp (@start)
@@ -118,8 +105,6 @@ int __delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk)
 	struct timespec ts;
 	unsigned long t1,t2,t3;
 
-	spin_lock(&tsk->delays_lock);
-
 	/* Though tsk->delays accessed later, early exit avoids
 	 * unnecessary returning of other data
 	 */
@@ -161,7 +146,6 @@ int __delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk)
 	spin_unlock(&tsk->delays->lock);
 
 done:
-	spin_unlock(&tsk->delays_lock);
 	return 0;
 }
 

trunk/kernel/exit.c

@@ -908,7 +908,6 @@ fastcall NORET_TYPE void do_exit(long code)
 		audit_free(tsk);
 	taskstats_exit_send(tsk, tidstats, group_dead, mycpu);
 	taskstats_exit_free(tidstats);
-	delayacct_tsk_exit(tsk);
 
 	exit_mm(tsk);
 

trunk/kernel/fork.c

@@ -117,6 +117,7 @@ void __put_task_struct(struct task_struct *tsk)
 	security_task_free(tsk);
 	free_uid(tsk->user);
 	put_group_info(tsk->group_info);
+	delayacct_tsk_free(tsk);
 
 	if (!profile_handoff_task(tsk))
 		free_task(tsk);
@@ -1011,7 +1012,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 	retval = -EFAULT;
 	if (clone_flags & CLONE_PARENT_SETTID)
 		if (put_user(p->pid, parent_tidptr))
-			goto bad_fork_cleanup;
+			goto bad_fork_cleanup_delays_binfmt;
 
 	INIT_LIST_HEAD(&p->children);
 	INIT_LIST_HEAD(&p->sibling);
@@ -1277,7 +1278,8 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 bad_fork_cleanup_cpuset:
 #endif
 	cpuset_exit(p);
-bad_fork_cleanup:
+bad_fork_cleanup_delays_binfmt:
+	delayacct_tsk_free(p);
 	if (p->binfmt)
 		module_put(p->binfmt->module);
 bad_fork_cleanup_put_domain: