sched: Convert thread_group_cputimer lock to atomic_spinlock

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

include/linux/init_task.h

@@ -27,7 +27,7 @@ extern struct fs_struct init_fs;
 	.cputimer	= { 						\
 		.cputime = INIT_CPUTIME,				\
 		.running = 0,						\
-		.lock = __SPIN_LOCK_UNLOCKED(sig.cputimer.lock),	\
+		.lock = __ATOMIC_SPIN_LOCK_UNLOCKED(sig.cputimer.lock),	\
 	},								\
 }
 

include/linux/sched.h

@@ -520,7 +520,7 @@ struct task_cputime {
 struct thread_group_cputimer {
 	struct task_cputime cputime;
 	int running;
-	spinlock_t lock;
+	atomic_spinlock_t lock;
 };
 
 /*
@@ -2321,7 +2321,7 @@ void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times);
 static inline void thread_group_cputime_init(struct signal_struct *sig)
 {
 	sig->cputimer.cputime = INIT_CPUTIME;
-	spin_lock_init(&sig->cputimer.lock);
+	atomic_spin_lock_init(&sig->cputimer.lock);
 	sig->cputimer.running = 0;
 }
 

kernel/posix-cpu-timers.c

@@ -279,7 +279,7 @@ void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times)
 	struct task_cputime sum;
 	unsigned long flags;
 
-	spin_lock_irqsave(&cputimer->lock, flags);
+	atomic_spin_lock_irqsave(&cputimer->lock, flags);
 	if (!cputimer->running) {
 		cputimer->running = 1;
 		/*
@@ -292,7 +292,7 @@ void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times)
 		update_gt_cputime(&cputimer->cputime, &sum);
 	}
 	*times = cputimer->cputime;
-	spin_unlock_irqrestore(&cputimer->lock, flags);
+	atomic_spin_unlock_irqrestore(&cputimer->lock, flags);
 }
 
 /*
@@ -1065,9 +1065,9 @@ static void stop_process_timers(struct task_struct *tsk)
 	if (!cputimer->running)
 		return;
 
-	spin_lock_irqsave(&cputimer->lock, flags);
+	atomic_spin_lock_irqsave(&cputimer->lock, flags);
 	cputimer->running = 0;
-	spin_unlock_irqrestore(&cputimer->lock, flags);
+	atomic_spin_unlock_irqrestore(&cputimer->lock, flags);
 }
 
 /*

kernel/sched_stats.h

@@ -306,10 +306,10 @@ static inline void account_group_user_time(struct task_struct *tsk,
 	if (!cputimer->running)
 		return;
 
-	spin_lock(&cputimer->lock);
+	atomic_spin_lock(&cputimer->lock);
 	cputimer->cputime.utime =
 		cputime_add(cputimer->cputime.utime, cputime);
-	spin_unlock(&cputimer->lock);
+	atomic_spin_unlock(&cputimer->lock);
 }
 
 /**
@@ -336,10 +336,10 @@ static inline void account_group_system_time(struct task_struct *tsk,
 	if (!cputimer->running)
 		return;
 
-	spin_lock(&cputimer->lock);
+	atomic_spin_lock(&cputimer->lock);
 	cputimer->cputime.stime =
 		cputime_add(cputimer->cputime.stime, cputime);
-	spin_unlock(&cputimer->lock);
+	atomic_spin_unlock(&cputimer->lock);
 }
 
 /**
@@ -369,7 +369,7 @@ static inline void account_group_exec_runtime(struct task_struct *tsk,
 	if (!cputimer->running)
 		return;
 
-	spin_lock(&cputimer->lock);
+	atomic_spin_lock(&cputimer->lock);
 	cputimer->cputime.sum_exec_runtime += ns;
-	spin_unlock(&cputimer->lock);
+	atomic_spin_unlock(&cputimer->lock);
 }