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Subject[PATCH v2] hrtimer: consolidate hrtimer_init() + hrtimer_init_sleeper() calls
Date
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

hrtimer_init_sleeper() calls require a prior initialisation of the
hrtimer object with hrtimer_init(). Lets make the initialisation of
the hrtimer object part of hrtimer_init_sleeper(). To remain
consistent consider init_on_stack as well.

Beside adapting the hrtimer_init_sleeper[_on_stack]() functions, call
sites need to be updated as well.

Link: http://lkml.kernel.org/r/20170905135719.qsj4h5twhjkmkbak@linutronix.de
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
[anna-maria: Updating the commit message]
Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
---

v1..v2: Fix missing call site in drivers/staging/android/vsoc.c

block/blk-mq.c | 3 +--
drivers/staging/android/vsoc.c | 6 ++---
include/linux/hrtimer.h | 19 +++++++++++---
include/linux/wait.h | 4 +--
kernel/futex.c | 19 ++++++--------
kernel/time/hrtimer.c | 46 ++++++++++++++++++++++++++--------
net/core/pktgen.c | 4 +--
7 files changed, 67 insertions(+), 34 deletions(-)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 95919268564b..f95ad9ede0f6 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -2984,10 +2984,9 @@ static bool blk_mq_poll_hybrid_sleep(struct request_queue *q,
kt = nsecs;

mode = HRTIMER_MODE_REL;
- hrtimer_init_on_stack(&hs.timer, CLOCK_MONOTONIC, mode);
+ hrtimer_init_sleeper_on_stack(&hs, CLOCK_MONOTONIC, mode, current);
hrtimer_set_expires(&hs.timer, kt);

- hrtimer_init_sleeper(&hs, current);
do {
if (blk_mq_rq_state(rq) == MQ_RQ_COMPLETE)
break;
diff --git a/drivers/staging/android/vsoc.c b/drivers/staging/android/vsoc.c
index 806beda1040b..6c7f666c0e33 100644
--- a/drivers/staging/android/vsoc.c
+++ b/drivers/staging/android/vsoc.c
@@ -438,12 +438,10 @@ static int handle_vsoc_cond_wait(struct file *filp, struct vsoc_cond_wait *arg)

if (!timespec_valid(&ts))
return -EINVAL;
- hrtimer_init_on_stack(&to->timer, CLOCK_MONOTONIC,
- HRTIMER_MODE_ABS);
+ hrtimer_init_sleeper_on_stack(to, CLOCK_MONOTONIC,
+ HRTIMER_MODE_ABS, current);
hrtimer_set_expires_range_ns(&to->timer, timespec_to_ktime(ts),
current->timer_slack_ns);
-
- hrtimer_init_sleeper(to, current);
}

while (1) {
diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index 3892e9c8b2de..b8bbaabd5aff 100644
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -364,10 +364,17 @@ DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
/* Initialize timers: */
extern void hrtimer_init(struct hrtimer *timer, clockid_t which_clock,
enum hrtimer_mode mode);
+extern void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, clockid_t clock_id,
+ enum hrtimer_mode mode,
+ struct task_struct *task);

#ifdef CONFIG_DEBUG_OBJECTS_TIMERS
extern void hrtimer_init_on_stack(struct hrtimer *timer, clockid_t which_clock,
enum hrtimer_mode mode);
+extern void hrtimer_init_sleeper_on_stack(struct hrtimer_sleeper *sl,
+ clockid_t clock_id,
+ enum hrtimer_mode mode,
+ struct task_struct *task);

extern void destroy_hrtimer_on_stack(struct hrtimer *timer);
#else
@@ -377,6 +384,15 @@ static inline void hrtimer_init_on_stack(struct hrtimer *timer,
{
hrtimer_init(timer, which_clock, mode);
}
+
+static inline void hrtimer_init_sleeper_on_stack(struct hrtimer_sleeper *sl,
+ clockid_t clock_id,
+ enum hrtimer_mode mode,
+ struct task_struct *task)
+{
+ hrtimer_init_sleeper(sl, clock_id, mode, task);
+}
+
static inline void destroy_hrtimer_on_stack(struct hrtimer *timer) { }
#endif

@@ -480,9 +496,6 @@ extern long hrtimer_nanosleep(const struct timespec64 *rqtp,
const enum hrtimer_mode mode,
const clockid_t clockid);

-extern void hrtimer_init_sleeper(struct hrtimer_sleeper *sl,
- struct task_struct *tsk);
-
extern int schedule_hrtimeout_range(ktime_t *expires, u64 delta,
const enum hrtimer_mode mode);
extern int schedule_hrtimeout_range_clock(ktime_t *expires,
diff --git a/include/linux/wait.h b/include/linux/wait.h
index d9f131ecf708..a0938fc8dcdb 100644
--- a/include/linux/wait.h
+++ b/include/linux/wait.h
@@ -488,8 +488,8 @@ do { \
int __ret = 0; \
struct hrtimer_sleeper __t; \
\
- hrtimer_init_on_stack(&__t.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); \
- hrtimer_init_sleeper(&__t, current); \
+ hrtimer_init_sleeper_on_stack(&__t, CLOCK_MONOTONIC, HRTIMER_MODE_REL, \
+ current); \
if ((timeout) != KTIME_MAX) \
hrtimer_start_range_ns(&__t.timer, timeout, \
current->timer_slack_ns, \
diff --git a/kernel/futex.c b/kernel/futex.c
index 1f450e092c74..146432d78e06 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -2624,10 +2624,9 @@ static int futex_wait(u32 __user *uaddr, unsigned int flags, u32 val,
if (abs_time) {
to = &timeout;

- hrtimer_init_on_stack(&to->timer, (flags & FLAGS_CLOCKRT) ?
- CLOCK_REALTIME : CLOCK_MONOTONIC,
- HRTIMER_MODE_ABS);
- hrtimer_init_sleeper(to, current);
+ hrtimer_init_sleeper_on_stack(to, (flags & FLAGS_CLOCKRT) ?
+ CLOCK_REALTIME : CLOCK_MONOTONIC,
+ HRTIMER_MODE_ABS, current);
hrtimer_set_expires_range_ns(&to->timer, *abs_time,
current->timer_slack_ns);
}
@@ -2726,9 +2725,8 @@ static int futex_lock_pi(u32 __user *uaddr, unsigned int flags,

if (time) {
to = &timeout;
- hrtimer_init_on_stack(&to->timer, CLOCK_REALTIME,
- HRTIMER_MODE_ABS);
- hrtimer_init_sleeper(to, current);
+ hrtimer_init_sleeper_on_stack(to, CLOCK_REALTIME,
+ HRTIMER_MODE_ABS, current);
hrtimer_set_expires(&to->timer, *time);
}

@@ -3125,10 +3123,9 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags,

if (abs_time) {
to = &timeout;
- hrtimer_init_on_stack(&to->timer, (flags & FLAGS_CLOCKRT) ?
- CLOCK_REALTIME : CLOCK_MONOTONIC,
- HRTIMER_MODE_ABS);
- hrtimer_init_sleeper(to, current);
+ hrtimer_init_sleeper_on_stack(to, (flags & FLAGS_CLOCKRT) ?
+ CLOCK_REALTIME : CLOCK_MONOTONIC,
+ HRTIMER_MODE_ABS, current);
hrtimer_set_expires_range_ns(&to->timer, *abs_time,
current->timer_slack_ns);
}
diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index 3e93c54bd3a1..56ff1c889b18 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -1649,13 +1649,44 @@ static enum hrtimer_restart hrtimer_wakeup(struct hrtimer *timer)
return HRTIMER_NORESTART;
}

-void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, struct task_struct *task)
+static void __hrtimer_init_sleeper(struct hrtimer_sleeper *sl,
+ clockid_t clock_id,
+ enum hrtimer_mode mode,
+ struct task_struct *task)
{
+ __hrtimer_init(&sl->timer, clock_id, mode);
sl->timer.function = hrtimer_wakeup;
sl->task = task;
}
+
+/**
+ * hrtimer_init_sleeper - initialize sleeper to the given clock
+ * @sl: sleeper to be initialized
+ * @clock_id: the clock to be used
+ * @mode: timer mode abs/rel
+ * @task: the task to wake up
+ */
+void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, clockid_t clock_id,
+ enum hrtimer_mode mode, struct task_struct *task)
+{
+ debug_init(&sl->timer, clock_id, mode);
+ __hrtimer_init_sleeper(sl, clock_id, mode, task);
+
+}
EXPORT_SYMBOL_GPL(hrtimer_init_sleeper);

+#ifdef CONFIG_DEBUG_OBJECTS_TIMERS
+void hrtimer_init_sleeper_on_stack(struct hrtimer_sleeper *sl,
+ clockid_t clock_id,
+ enum hrtimer_mode mode,
+ struct task_struct *task)
+{
+ debug_object_init_on_stack(&sl->timer, &hrtimer_debug_descr);
+ __hrtimer_init_sleeper(sl, clock_id, mode, task);
+}
+EXPORT_SYMBOL_GPL(hrtimer_init_sleeper_on_stack);
+#endif
+
int nanosleep_copyout(struct restart_block *restart, struct timespec64 *ts)
{
switch(restart->nanosleep.type) {
@@ -1679,8 +1710,6 @@ static int __sched do_nanosleep(struct hrtimer_sleeper *t, enum hrtimer_mode mod
{
struct restart_block *restart;

- hrtimer_init_sleeper(t, current);
-
do {
set_current_state(TASK_INTERRUPTIBLE);
hrtimer_start_expires(&t->timer, mode);
@@ -1717,10 +1746,9 @@ static long __sched hrtimer_nanosleep_restart(struct restart_block *restart)
struct hrtimer_sleeper t;
int ret;

- hrtimer_init_on_stack(&t.timer, restart->nanosleep.clockid,
- HRTIMER_MODE_ABS);
+ hrtimer_init_sleeper_on_stack(&t, restart->nanosleep.clockid,
+ HRTIMER_MODE_ABS, current);
hrtimer_set_expires_tv64(&t.timer, restart->nanosleep.expires);
-
ret = do_nanosleep(&t, HRTIMER_MODE_ABS);
destroy_hrtimer_on_stack(&t.timer);
return ret;
@@ -1738,7 +1766,7 @@ long hrtimer_nanosleep(const struct timespec64 *rqtp,
if (dl_task(current) || rt_task(current))
slack = 0;

- hrtimer_init_on_stack(&t.timer, clockid, mode);
+ hrtimer_init_sleeper_on_stack(&t, clockid, mode, current);
hrtimer_set_expires_range_ns(&t.timer, timespec64_to_ktime(*rqtp), slack);
ret = do_nanosleep(&t, mode);
if (ret != -ERESTART_RESTARTBLOCK)
@@ -1937,11 +1965,9 @@ schedule_hrtimeout_range_clock(ktime_t *expires, u64 delta,
return -EINTR;
}

- hrtimer_init_on_stack(&t.timer, clock_id, mode);
+ hrtimer_init_sleeper_on_stack(&t, clock_id, mode, current);
hrtimer_set_expires_range_ns(&t.timer, *expires, delta);

- hrtimer_init_sleeper(&t, current);
-
hrtimer_start_expires(&t.timer, mode);

if (likely(t.task))
diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index 49368e21d228..ac2d059ad598 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -2162,7 +2162,8 @@ static void spin(struct pktgen_dev *pkt_dev, ktime_t spin_until)
s64 remaining;
struct hrtimer_sleeper t;

- hrtimer_init_on_stack(&t.timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
+ hrtimer_init_sleeper_on_stack(&t, CLOCK_MONOTONIC, HRTIMER_MODE_ABS,
+ current);
hrtimer_set_expires(&t.timer, spin_until);

remaining = ktime_to_ns(hrtimer_expires_remaining(&t.timer));
@@ -2177,7 +2178,6 @@ static void spin(struct pktgen_dev *pkt_dev, ktime_t spin_until)
} while (ktime_compare(end_time, spin_until) < 0);
} else {
/* see do_nanosleep */
- hrtimer_init_sleeper(&t, current);
do {
set_current_state(TASK_INTERRUPTIBLE);
hrtimer_start_expires(&t.timer, HRTIMER_MODE_ABS);
--
2.18.0
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