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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: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Thomas Gleixner 2009-07-25 18:56:56 +02:00 committed by Ingo Molnar
parent 07354eb1a7
commit ee30a7b2fc
4 changed files with 15 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/init_task.h
View File

@ -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), \

4
include/linux/sched.h
View File

@ -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);
}
/*

12
kernel/posix-cpu-timers.c
View File

@ -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;

12
kernel/sched_stats.h
View File

@ -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);
}