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posix-timers: Cleanup struct k_itimer 

As a preparation for further changes, cleanup the formatting of the
k_itimer structure and add kernel doc comments.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: John Stultz <john.stultz@linaro.org>
Link: http://lkml.kernel.org/r/20170530211656.316574129@linutronix.de
hifive-unleashed-5.1
Thomas Gleixner 2017-05-30 23:15:40 +02:00
parent 6631fa12c1
commit 03676b41a8
1 changed files with 40 additions and 21 deletions
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61
include/linux/posix-timers.h
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@ -49,35 +49,54 @@ struct cpu_timer_list {
#define FD_TO_CLOCKID(fd) ((~(clockid_t) (fd) << 3) | CLOCKFD)
#define CLOCKID_TO_FD(clk) ((unsigned int) ~((clk) >> 3))
/* POSIX.1b interval timer structure. */
struct k_itimer {
struct list_head list; /* free/ allocate list */
struct hlist_node t_hash;
spinlock_t it_lock;
clockid_t it_clock; /* which timer type */
timer_t it_id; /* timer id */
int it_overrun; /* overrun on pending signal */
int it_overrun_last; /* overrun on last delivered signal */
int it_requeue_pending; /* waiting to requeue this timer */
#define REQUEUE_PENDING 1
int it_sigev_notify; /* notify word of sigevent struct */
struct signal_struct *it_signal;
/**
* struct k_itimer - POSIX.1b interval timer structure.
* @list: List head for binding the timer to signals->posix_timers
* @t_hash: Entry in the posix timer hash table
* @it_lock: Lock protecting the timer
* @it_clock: The posix timer clock id
* @it_id: The posix timer id for identifying the timer
* @it_overrun: The overrun counter for pending signals
* @it_overrun_last: The overrun at the time of the last delivered signal
* @it_requeue_pending: Indicator that timer waits for being requeued on
* signal delivery
* @it_sigev_notify: The notify word of sigevent struct for signal delivery
* @it_signal: Pointer to the creators signal struct
* @it_pid: The pid of the process/task targeted by the signal
* @it_process: The task to wakeup on clock_nanosleep (CPU timers)
* @sigq: Pointer to preallocated sigqueue
* @it: Union representing the various posix timer type
* internals. Also used for rcu freeing the timer.
*/
struct k_itimer {
struct list_head list;
struct hlist_node t_hash;
spinlock_t it_lock;
clockid_t it_clock;
timer_t it_id;
int it_overrun;
int it_overrun_last;
int it_requeue_pending;
int it_sigev_notify;
struct signal_struct *it_signal;
union {
struct pid *it_pid; /* pid of process to send signal to */
struct task_struct *it_process; /* for clock_nanosleep */
struct pid *it_pid;
struct task_struct *it_process;
};
struct sigqueue *sigq; /* signal queue entry. */
struct sigqueue *sigq;
union {
struct {
struct hrtimer timer;
ktime_t interval;
struct hrtimer timer;
ktime_t interval;
} real;
struct cpu_timer_list cpu;
struct cpu_timer_list cpu;
struct {
struct alarm alarmtimer;
ktime_t interval;
struct alarm alarmtimer;
ktime_t interval;
} alarm;
struct rcu_head rcu;
struct rcu_head rcu;
} it;
};