}
/**
- * init_timer - initialize a timer.
+ * init_timer_key - initialize a timer
* @timer: the timer to be initialized
+ * @name: name of the timer
+ * @key: lockdep class key of the fake lock used for tracking timer
+ * sync lock dependencies
*
- * init_timer() must be done to a timer prior calling *any* of the
+ * init_timer_key() must be done to a timer prior calling *any* of the
* other timer functions.
*/
void init_timer(struct timer_list *timer)
}
}
-int __mod_timer(struct timer_list *timer, unsigned long expires)
+static inline int
+__mod_timer(struct timer_list *timer, unsigned long expires, bool pending_only)
{
struct tvec_base *base, *new_base;
unsigned long flags;
- int ret = 0;
+ int ret;
+
+ ret = 0;
timer_stats_timer_set_start_info(timer);
BUG_ON(!timer->function);
if (timer_pending(timer)) {
detach_timer(timer, 0);
ret = 1;
+ } else {
+ if (pending_only)
+ goto out_unlock;
}
debug_timer_activate(timer);
timer->expires = expires;
internal_add_timer(base, timer);
+
+out_unlock:
spin_unlock_irqrestore(&base->lock, flags);
return ret;
}
-EXPORT_SYMBOL(__mod_timer);
-
/**
- * add_timer_on - start a timer on a particular CPU
- * @timer: the timer to be added
- * @cpu: the CPU to start it on
+ * mod_timer_pending - modify a pending timer's timeout
+ * @timer: the pending timer to be modified
+ * @expires: new timeout in jiffies
*
- * This is not very scalable on SMP. Double adds are not possible.
+ * mod_timer_pending() is the same for pending timers as mod_timer(),
+ * but will not re-activate and modify already deleted timers.
+ *
+ * It is useful for unserialized use of timers.
*/
-void add_timer_on(struct timer_list *timer, int cpu)
+int mod_timer_pending(struct timer_list *timer, unsigned long expires)
{
- struct tvec_base *base = per_cpu(tvec_bases, cpu);
- unsigned long flags;
-
- timer_stats_timer_set_start_info(timer);
- BUG_ON(timer_pending(timer) || !timer->function);
- spin_lock_irqsave(&base->lock, flags);
- timer_set_base(timer, base);
- debug_timer_activate(timer);
- internal_add_timer(base, timer);
- /*
- * Check whether the other CPU is idle and needs to be
- * triggered to reevaluate the timer wheel when nohz is
- * active. We are protected against the other CPU fiddling
- * with the timer by holding the timer base lock. This also
- * makes sure that a CPU on the way to idle can not evaluate
- * the timer wheel.
- */
- wake_up_idle_cpu(cpu);
- spin_unlock_irqrestore(&base->lock, flags);
+ return __mod_timer(timer, expires, true);
}
+EXPORT_SYMBOL(mod_timer_pending);
/**
* mod_timer - modify a timer's timeout
*/
int mod_timer(struct timer_list *timer, unsigned long expires)
{
- BUG_ON(!timer->function);
-
- timer_stats_timer_set_start_info(timer);
/*
* This is a common optimization triggered by the
* networking code - if the timer is re-modified
if (timer->expires == expires && timer_pending(timer))
return 1;
- return __mod_timer(timer, expires);
+ return __mod_timer(timer, expires, false);
}
-
EXPORT_SYMBOL(mod_timer);
+/**
+ * add_timer - start a timer
+ * @timer: the timer to be added
+ *
+ * The kernel will do a ->function(->data) callback from the
+ * timer interrupt at the ->expires point in the future. The
+ * current time is 'jiffies'.
+ *
+ * The timer's ->expires, ->function (and if the handler uses it, ->data)
+ * fields must be set prior calling this function.
+ *
+ * Timers with an ->expires field in the past will be executed in the next
+ * timer tick.
+ */
+void add_timer(struct timer_list *timer)
+{
+ BUG_ON(timer_pending(timer));
+ mod_timer(timer, timer->expires);
+}
+EXPORT_SYMBOL(add_timer);
+
+/**
+ * add_timer_on - start a timer on a particular CPU
+ * @timer: the timer to be added
+ * @cpu: the CPU to start it on
+ *
+ * This is not very scalable on SMP. Double adds are not possible.
+ */
+void add_timer_on(struct timer_list *timer, int cpu)
+{
+ struct tvec_base *base = per_cpu(tvec_bases, cpu);
+ unsigned long flags;
+
+ timer_stats_timer_set_start_info(timer);
+ BUG_ON(timer_pending(timer) || !timer->function);
+ spin_lock_irqsave(&base->lock, flags);
+ timer_set_base(timer, base);
+ debug_timer_activate(timer);
+ internal_add_timer(base, timer);
+ /*
+ * Check whether the other CPU is idle and needs to be
+ * triggered to reevaluate the timer wheel when nohz is
+ * active. We are protected against the other CPU fiddling
+ * with the timer by holding the timer base lock. This also
+ * makes sure that a CPU on the way to idle can not evaluate
+ * the timer wheel.
+ */
+ wake_up_idle_cpu(cpu);
+ spin_unlock_irqrestore(&base->lock, flags);
+}
+
/**
* del_timer - deactive a timer.
* @timer: the timer to be deactivated
return ret;
}
-
EXPORT_SYMBOL(del_timer);
#ifdef CONFIG_SMP
return ret;
}
-
EXPORT_SYMBOL(try_to_del_timer_sync);
/**
cpu_relax();
}
}
-
EXPORT_SYMBOL(del_timer_sync);
#endif
* value of ->real_parent under rcu_read_lock(), see
* release_task()->call_rcu(delayed_put_task_struct).
*/
-asmlinkage long sys_getppid(void)
+SYSCALL_DEFINE0(getppid)
{
int pid;
return pid;
}
-asmlinkage long sys_getuid(void)
+SYSCALL_DEFINE0(getuid)
{
/* Only we change this so SMP safe */
return current_uid();
}
-asmlinkage long sys_geteuid(void)
+SYSCALL_DEFINE0(geteuid)
{
/* Only we change this so SMP safe */
return current_euid();
}
-asmlinkage long sys_getgid(void)
+SYSCALL_DEFINE0(getgid)
{
/* Only we change this so SMP safe */
return current_gid();
}
-asmlinkage long sys_getegid(void)
+SYSCALL_DEFINE0(getegid)
{
/* Only we change this so SMP safe */
return current_egid();
expire = timeout + jiffies;
setup_timer_on_stack(&timer, process_timeout, (unsigned long)current);
- __mod_timer(&timer, expire);
+ __mod_timer(&timer, expire, false);
schedule();
del_singleshot_timer_sync(&timer);
return 0;
}
-asmlinkage long sys_sysinfo(struct sysinfo __user *info)
+SYSCALL_DEFINE1(sysinfo, struct sysinfo __user *, info)
{
struct sysinfo val;
git.openpandora.org / pandora-kernel.git / blobdiff