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Commit ee30a7b2 authored by Thomas Gleixner's avatar Thomas Gleixner Committed by Ingo Molnar
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locking, sched: Annotate thread_group_cputimer as raw 



The thread_group_cputimer lock can be taken in atomic context and therefore
cannot be preempted on -rt - annotate it.

In mainline this change documents the low level nature of
the lock - otherwise there's no functional difference. Lockdep
and Sparse checking will work as usual.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 07354eb1

include/linux/init_task.h

+1 −1
Original line number Diff line number Diff line
@@ -42,7 +42,7 @@ extern struct fs_struct init_fs; 
	.cputimer	= { 						\

		.cputime = INIT_CPUTIME,				\

		.running = 0,						\

		.lock = __SPIN_LOCK_UNLOCKED(sig.cputimer.lock),	\

		.lock = __RAW_SPIN_LOCK_UNLOCKED(sig.cputimer.lock),	\

	},								\

	.cred_guard_mutex =						\

		 __MUTEX_INITIALIZER(sig.cred_guard_mutex),		\

include/linux/sched.h

+2 −2
Original line number Diff line number Diff line
@@ -510,7 +510,7 @@ struct task_cputime { 
struct thread_group_cputimer {

	struct task_cputime cputime;

	int running;

	spinlock_t lock;

	raw_spinlock_t lock;

};



#include <linux/rwsem.h>
@@ -2566,7 +2566,7 @@ void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times); 


static inline void thread_group_cputime_init(struct signal_struct *sig)

{

	spin_lock_init(&sig->cputimer.lock);

	raw_spin_lock_init(&sig->cputimer.lock);

}



/*

kernel/posix-cpu-timers.c

+6 −6
Original line number Diff line number Diff line
@@ -274,7 +274,7 @@ 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);

	raw_spin_lock_irqsave(&cputimer->lock, flags);

	if (!cputimer->running) {

		cputimer->running = 1;

		/*
@@ -287,7 +287,7 @@ 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);

	raw_spin_unlock_irqrestore(&cputimer->lock, flags);

}



/*
@@ -997,9 +997,9 @@ static void stop_process_timers(struct signal_struct *sig) 
	struct thread_group_cputimer *cputimer = &sig->cputimer;

	unsigned long flags;



	spin_lock_irqsave(&cputimer->lock, flags);

	raw_spin_lock_irqsave(&cputimer->lock, flags);

	cputimer->running = 0;

	spin_unlock_irqrestore(&cputimer->lock, flags);

	raw_spin_unlock_irqrestore(&cputimer->lock, flags);

}



static u32 onecputick;
@@ -1289,9 +1289,9 @@ static inline int fastpath_timer_check(struct task_struct *tsk) 
	if (sig->cputimer.running) {

		struct task_cputime group_sample;



		spin_lock(&sig->cputimer.lock);

		raw_spin_lock(&sig->cputimer.lock);

		group_sample = sig->cputimer.cputime;

		spin_unlock(&sig->cputimer.lock);

		raw_spin_unlock(&sig->cputimer.lock);



		if (task_cputime_expired(&group_sample, &sig->cputime_expires))

			return 1;

kernel/sched_stats.h

+6 −6
Original line number Diff line number Diff line
@@ -282,10 +282,10 @@ static inline void account_group_user_time(struct task_struct *tsk, 
	if (!cputimer->running)

		return;



	spin_lock(&cputimer->lock);

	raw_spin_lock(&cputimer->lock);

	cputimer->cputime.utime =

		cputime_add(cputimer->cputime.utime, cputime);

	spin_unlock(&cputimer->lock);

	raw_spin_unlock(&cputimer->lock);

}



/**
@@ -306,10 +306,10 @@ static inline void account_group_system_time(struct task_struct *tsk, 
	if (!cputimer->running)

		return;



	spin_lock(&cputimer->lock);

	raw_spin_lock(&cputimer->lock);

	cputimer->cputime.stime =

		cputime_add(cputimer->cputime.stime, cputime);

	spin_unlock(&cputimer->lock);

	raw_spin_unlock(&cputimer->lock);

}



/**
@@ -330,7 +330,7 @@ static inline void account_group_exec_runtime(struct task_struct *tsk, 
	if (!cputimer->running)

		return;



	spin_lock(&cputimer->lock);

	raw_spin_lock(&cputimer->lock);

	cputimer->cputime.sum_exec_runtime += ns;

	spin_unlock(&cputimer->lock);

	raw_spin_unlock(&cputimer->lock);

}