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Subject[patch 23/46] hrtimers: namespace and enum cleanup
From: Thomas Gleixner <tglx@linutronix.de>

- hrtimers did not use the hrtimer_restart enum and relied on the implict
int representation. Fix the prototypes and the functions using the enums.
- Use seperate name spaces for the enumerations
- Convert hrtimer_restart macro to inline function
- Add comments

No functional changes.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

include/linux/hrtimer.h | 20 ++++++++++++--------
include/linux/timer.h | 2 +-
kernel/fork.c | 2 +-
kernel/futex.c | 2 +-
kernel/hrtimer.c | 18 +++++++++---------
kernel/itimer.c | 4 ++--
kernel/posix-timers.c | 13 +++++++------
kernel/rtmutex.c | 2 +-
8 files changed, 34 insertions(+), 29 deletions(-)

Index: linux-2.6.20-rc4-mm1-bo/include/linux/hrtimer.h
===================================================================
--- linux-2.6.20-rc4-mm1-bo.orig/include/linux/hrtimer.h
+++ linux-2.6.20-rc4-mm1-bo/include/linux/hrtimer.h
@@ -25,17 +25,18 @@
* Mode arguments of xxx_hrtimer functions:
*/
enum hrtimer_mode {
- HRTIMER_ABS, /* Time value is absolute */
- HRTIMER_REL, /* Time value is relative to now */
+ HRTIMER_MODE_ABS, /* Time value is absolute */
+ HRTIMER_MODE_REL, /* Time value is relative to now */
};

+/*
+ * Return values for the callback function
+ */
enum hrtimer_restart {
- HRTIMER_NORESTART,
- HRTIMER_RESTART,
+ HRTIMER_NORESTART, /* Timer is not restarted */
+ HRTIMER_RESTART, /* Timer must be restarted */
};

-#define HRTIMER_INACTIVE ((void *)1UL)
-
struct hrtimer_base;

/**
@@ -52,7 +53,7 @@ struct hrtimer_base;
struct hrtimer {
struct rb_node node;
ktime_t expires;
- int (*function)(struct hrtimer *);
+ enum hrtimer_restart (*function)(struct hrtimer *);
struct hrtimer_base *base;
};

@@ -114,7 +115,10 @@ extern int hrtimer_start(struct hrtimer
extern int hrtimer_cancel(struct hrtimer *timer);
extern int hrtimer_try_to_cancel(struct hrtimer *timer);

-#define hrtimer_restart(timer) hrtimer_start((timer), (timer)->expires, HRTIMER_ABS)
+static inline int hrtimer_restart(struct hrtimer *timer)
+{
+ return hrtimer_start(timer, timer->expires, HRTIMER_MODE_ABS);
+}

/* Query timers: */
extern ktime_t hrtimer_get_remaining(const struct hrtimer *timer);
Index: linux-2.6.20-rc4-mm1-bo/include/linux/timer.h
===================================================================
--- linux-2.6.20-rc4-mm1-bo.orig/include/linux/timer.h
+++ linux-2.6.20-rc4-mm1-bo/include/linux/timer.h
@@ -106,7 +106,7 @@ static inline void add_timer(struct time
extern void init_timers(void);
extern void run_local_timers(void);
struct hrtimer;
-extern int it_real_fn(struct hrtimer *);
+extern enum hrtimer_restart it_real_fn(struct hrtimer *);

unsigned long __round_jiffies(unsigned long j, int cpu);
unsigned long __round_jiffies_relative(unsigned long j, int cpu);
Index: linux-2.6.20-rc4-mm1-bo/kernel/fork.c
===================================================================
--- linux-2.6.20-rc4-mm1-bo.orig/kernel/fork.c
+++ linux-2.6.20-rc4-mm1-bo/kernel/fork.c
@@ -858,7 +858,7 @@ static inline int copy_signal(unsigned l
init_sigpending(&sig->shared_pending);
INIT_LIST_HEAD(&sig->posix_timers);

- hrtimer_init(&sig->real_timer, CLOCK_MONOTONIC, HRTIMER_REL);
+ hrtimer_init(&sig->real_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
sig->it_real_incr.tv64 = 0;
sig->real_timer.function = it_real_fn;
sig->tsk = tsk;
Index: linux-2.6.20-rc4-mm1-bo/kernel/futex.c
===================================================================
--- linux-2.6.20-rc4-mm1-bo.orig/kernel/futex.c
+++ linux-2.6.20-rc4-mm1-bo/kernel/futex.c
@@ -1134,7 +1134,7 @@ static int futex_lock_pi(u32 __user *uad

if (sec != MAX_SCHEDULE_TIMEOUT) {
to = &timeout;
- hrtimer_init(&to->timer, CLOCK_REALTIME, HRTIMER_ABS);
+ hrtimer_init(&to->timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
hrtimer_init_sleeper(to, current);
to->timer.expires = ktime_set(sec, nsec);
}
Index: linux-2.6.20-rc4-mm1-bo/kernel/hrtimer.c
===================================================================
--- linux-2.6.20-rc4-mm1-bo.orig/kernel/hrtimer.c
+++ linux-2.6.20-rc4-mm1-bo/kernel/hrtimer.c
@@ -444,7 +444,7 @@ hrtimer_start(struct hrtimer *timer, kti
/* Switch the timer base, if necessary: */
new_base = switch_hrtimer_base(timer, base);

- if (mode == HRTIMER_REL) {
+ if (mode == HRTIMER_MODE_REL) {
tim = ktime_add(tim, new_base->get_time());
/*
* CONFIG_TIME_LOW_RES is a temporary way for architectures
@@ -583,7 +583,7 @@ void hrtimer_init(struct hrtimer *timer,

bases = __raw_get_cpu_var(hrtimer_bases);

- if (clock_id == CLOCK_REALTIME && mode != HRTIMER_ABS)
+ if (clock_id == CLOCK_REALTIME && mode != HRTIMER_MODE_ABS)
clock_id = CLOCK_MONOTONIC;

timer->base = &bases[clock_id];
@@ -627,7 +627,7 @@ static inline void run_hrtimer_queue(str

while ((node = base->first)) {
struct hrtimer *timer;
- int (*fn)(struct hrtimer *);
+ enum hrtimer_restart (*fn)(struct hrtimer *);
int restart;

timer = rb_entry(node, struct hrtimer, node);
@@ -669,7 +669,7 @@ void hrtimer_run_queues(void)
/*
* Sleep related functions:
*/
-static int hrtimer_wakeup(struct hrtimer *timer)
+static enum hrtimer_restart hrtimer_wakeup(struct hrtimer *timer)
{
struct hrtimer_sleeper *t =
container_of(timer, struct hrtimer_sleeper, timer);
@@ -699,7 +699,7 @@ static int __sched do_nanosleep(struct h
schedule();

hrtimer_cancel(&t->timer);
- mode = HRTIMER_ABS;
+ mode = HRTIMER_MODE_ABS;

} while (t->task && !signal_pending(current));

@@ -715,10 +715,10 @@ long __sched hrtimer_nanosleep_restart(s

restart->fn = do_no_restart_syscall;

- hrtimer_init(&t.timer, restart->arg0, HRTIMER_ABS);
+ hrtimer_init(&t.timer, restart->arg0, HRTIMER_MODE_ABS);
t.timer.expires.tv64 = ((u64)restart->arg3 << 32) | (u64) restart->arg2;

- if (do_nanosleep(&t, HRTIMER_ABS))
+ if (do_nanosleep(&t, HRTIMER_MODE_ABS))
return 0;

rmtp = (struct timespec __user *) restart->arg1;
@@ -751,7 +751,7 @@ long hrtimer_nanosleep(struct timespec *
return 0;

/* Absolute timers do not update the rmtp value and restart: */
- if (mode == HRTIMER_ABS)
+ if (mode == HRTIMER_MODE_ABS)
return -ERESTARTNOHAND;

if (rmtp) {
@@ -784,7 +784,7 @@ sys_nanosleep(struct timespec __user *rq
if (!timespec_valid(&tu))
return -EINVAL;

- return hrtimer_nanosleep(&tu, rmtp, HRTIMER_REL, CLOCK_MONOTONIC);
+ return hrtimer_nanosleep(&tu, rmtp, HRTIMER_MODE_REL, CLOCK_MONOTONIC);
}

/*
Index: linux-2.6.20-rc4-mm1-bo/kernel/itimer.c
===================================================================
--- linux-2.6.20-rc4-mm1-bo.orig/kernel/itimer.c
+++ linux-2.6.20-rc4-mm1-bo/kernel/itimer.c
@@ -128,7 +128,7 @@ asmlinkage long sys_getitimer(int which,
/*
* The timer is automagically restarted, when interval != 0
*/
-int it_real_fn(struct hrtimer *timer)
+enum hrtimer_restart it_real_fn(struct hrtimer *timer)
{
struct signal_struct *sig =
container_of(timer, struct signal_struct, real_timer);
@@ -235,7 +235,7 @@ again:
timeval_to_ktime(value->it_interval);
expires = timeval_to_ktime(value->it_value);
if (expires.tv64 != 0)
- hrtimer_start(timer, expires, HRTIMER_REL);
+ hrtimer_start(timer, expires, HRTIMER_MODE_REL);
spin_unlock_irq(&tsk->sighand->siglock);
break;
case ITIMER_VIRTUAL:
Index: linux-2.6.20-rc4-mm1-bo/kernel/posix-timers.c
===================================================================
--- linux-2.6.20-rc4-mm1-bo.orig/kernel/posix-timers.c
+++ linux-2.6.20-rc4-mm1-bo/kernel/posix-timers.c
@@ -145,7 +145,7 @@ static int common_timer_set(struct k_iti
struct itimerspec *, struct itimerspec *);
static int common_timer_del(struct k_itimer *timer);

-static int posix_timer_fn(struct hrtimer *data);
+static enum hrtimer_restart posix_timer_fn(struct hrtimer *data);

static struct k_itimer *lock_timer(timer_t timer_id, unsigned long *flags);

@@ -334,12 +334,12 @@ EXPORT_SYMBOL_GPL(posix_timer_event);

* This code is for CLOCK_REALTIME* and CLOCK_MONOTONIC* timers.
*/
-static int posix_timer_fn(struct hrtimer *timer)
+static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer)
{
struct k_itimer *timr;
unsigned long flags;
int si_private = 0;
- int ret = HRTIMER_NORESTART;
+ enum hrtimer_restart ret = HRTIMER_NORESTART;

timr = container_of(timer, struct k_itimer, it.real.timer);
spin_lock_irqsave(&timr->it_lock, flags);
@@ -722,7 +722,7 @@ common_timer_set(struct k_itimer *timr,
if (!new_setting->it_value.tv_sec && !new_setting->it_value.tv_nsec)
return 0;

- mode = flags & TIMER_ABSTIME ? HRTIMER_ABS : HRTIMER_REL;
+ mode = flags & TIMER_ABSTIME ? HRTIMER_MODE_ABS : HRTIMER_MODE_REL;
hrtimer_init(&timr->it.real.timer, timr->it_clock, mode);
timr->it.real.timer.function = posix_timer_fn;

@@ -734,7 +734,7 @@ common_timer_set(struct k_itimer *timr,
/* SIGEV_NONE timers are not queued ! See common_timer_get */
if (((timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE)) {
/* Setup correct expiry time for relative timers */
- if (mode == HRTIMER_REL)
+ if (mode == HRTIMER_MODE_REL)
timer->expires = ktime_add(timer->expires,
timer->base->get_time());
return 0;
@@ -950,7 +950,8 @@ static int common_nsleep(const clockid_t
struct timespec *tsave, struct timespec __user *rmtp)
{
return hrtimer_nanosleep(tsave, rmtp, flags & TIMER_ABSTIME ?
- HRTIMER_ABS : HRTIMER_REL, which_clock);
+ HRTIMER_MODE_ABS : HRTIMER_MODE_REL,
+ which_clock);
}

asmlinkage long
Index: linux-2.6.20-rc4-mm1-bo/kernel/rtmutex.c
===================================================================
--- linux-2.6.20-rc4-mm1-bo.orig/kernel/rtmutex.c
+++ linux-2.6.20-rc4-mm1-bo/kernel/rtmutex.c
@@ -625,7 +625,7 @@ rt_mutex_slowlock(struct rt_mutex *lock,
/* Setup the timer, when timeout != NULL */
if (unlikely(timeout))
hrtimer_start(&timeout->timer, timeout->timer.expires,
- HRTIMER_ABS);
+ HRTIMER_MODE_ABS);

for (;;) {
/* Try to acquire the lock: */
--

-
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