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Subject[PATCH 16/16] sched/wait: Make the __wait_event*() interface more friendly
Change all __wait_event*() implementations to match the corresponding
wait_event*() signature for convenience.

In particular this does away with the weird 'ret' logic. Since there
are __wait_event*() users this requires we update them too.

Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
---
arch/mips/kernel/rtlx.c | 19 +++---
include/linux/tty.h | 10 +--
include/linux/wait.h | 113 +++++++++++++++++++---------------------
net/irda/af_irda.c | 5 -
net/netfilter/ipvs/ip_vs_sync.c | 7 --
5 files changed, 73 insertions(+), 81 deletions(-)

--- a/arch/mips/kernel/rtlx.c
+++ b/arch/mips/kernel/rtlx.c
@@ -172,8 +172,9 @@ int rtlx_open(int index, int can_sleep)
if (rtlx == NULL) {
if( (p = vpe_get_shared(tclimit)) == NULL) {
if (can_sleep) {
- __wait_event_interruptible(channel_wqs[index].lx_queue,
- (p = vpe_get_shared(tclimit)), ret);
+ ret = __wait_event_interruptible(
+ channel_wqs[index].lx_queue,
+ (p = vpe_get_shared(tclimit)));
if (ret)
goto out_fail;
} else {
@@ -263,11 +264,10 @@ unsigned int rtlx_read_poll(int index, i
/* data available to read? */
if (chan->lx_read == chan->lx_write) {
if (can_sleep) {
- int ret = 0;
-
- __wait_event_interruptible(channel_wqs[index].lx_queue,
+ int ret = __wait_event_interruptible(
+ channel_wqs[index].lx_queue,
(chan->lx_read != chan->lx_write) ||
- sp_stopping, ret);
+ sp_stopping);
if (ret)
return ret;

@@ -440,14 +440,13 @@ static ssize_t file_write(struct file *f

/* any space left... */
if (!rtlx_write_poll(minor)) {
- int ret = 0;
+ int ret;

if (file->f_flags & O_NONBLOCK)
return -EAGAIN;

- __wait_event_interruptible(channel_wqs[minor].rt_queue,
- rtlx_write_poll(minor),
- ret);
+ ret = __wait_event_interruptible(channel_wqs[minor].rt_queue,
+ rtlx_write_poll(minor));
if (ret)
return ret;
}
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -672,14 +672,14 @@ static inline void tty_wait_until_sent_f
#define wait_event_interruptible_tty(tty, wq, condition) \
({ \
int __ret = 0; \
- if (!(condition)) { \
- __wait_event_interruptible_tty(tty, wq, condition, __ret); \
- } \
+ if (!(condition)) \
+ __ret = __wait_event_interruptible_tty(tty, wq, \
+ condition); \
__ret; \
})

-#define __wait_event_interruptible_tty(tty, wq, condition, ret) \
- ___wait_event(wq, condition, TASK_INTERRUPTIBLE, 0, ret, \
+#define __wait_event_interruptible_tty(tty, wq, condition) \
+ ___wait_event(wq, condition, TASK_INTERRUPTIBLE, 0, 0, \
tty_unlock(tty); \
schedule(); \
tty_lock(tty))
--- a/include/linux/wait.h
+++ b/include/linux/wait.h
@@ -179,24 +179,23 @@ wait_queue_head_t *bit_waitqueue(void *,
#define wake_up_interruptible_sync_poll(x, m) \
__wake_up_sync_key((x), TASK_INTERRUPTIBLE, 1, (void *) (m))

-#define ___wait_cond_timeout(condition, ret) \
+#define ___wait_cond_timeout(condition) \
({ \
bool __cond = (condition); \
- if (__cond && !ret) \
- ret = 1; \
- __cond || !ret; \
+ if (__cond && !__ret) \
+ __ret = 1; \
+ __cond || !__ret; \
})

#define ___wait_signal_pending(state) \
((state == TASK_INTERRUPTIBLE && signal_pending(current)) || \
(state == TASK_KILLABLE && fatal_signal_pending(current)))

-#define ___wait_nop_ret int ret __always_unused
-
#define ___wait_event(wq, condition, state, exclusive, ret, cmd) \
-do { \
+({ \
__label__ __out; \
DEFINE_WAIT(__wait); \
+ long __ret = ret; \
\
for (;;) { \
if (exclusive) \
@@ -208,7 +207,7 @@ do { \
break; \
\
if (___wait_signal_pending(state)) { \
- ret = -ERESTARTSYS; \
+ __ret = -ERESTARTSYS; \
if (exclusive) { \
abort_exclusive_wait(&wq, &__wait, \
state, NULL); \
@@ -220,12 +219,12 @@ do { \
cmd; \
} \
finish_wait(&wq, &__wait); \
-__out: ; \
-} while (0)
+__out: __ret; \
+})

#define __wait_event(wq, condition) \
- ___wait_event(wq, condition, TASK_UNINTERRUPTIBLE, 0, \
- ___wait_nop_ret, schedule())
+ (void)___wait_event(wq, condition, TASK_UNINTERRUPTIBLE, 0, 0, \
+ schedule())

/**
* wait_event - sleep until a condition gets true
@@ -246,10 +245,10 @@ do { \
__wait_event(wq, condition); \
} while (0)

-#define __wait_event_timeout(wq, condition, ret) \
- ___wait_event(wq, ___wait_cond_timeout(condition, ret), \
- TASK_UNINTERRUPTIBLE, 0, ret, \
- ret = schedule_timeout(ret))
+#define __wait_event_timeout(wq, condition, timeout) \
+ ___wait_event(wq, ___wait_cond_timeout(condition), \
+ TASK_UNINTERRUPTIBLE, 0, timeout, \
+ __ret = schedule_timeout(__ret))

/**
* wait_event_timeout - sleep until a condition gets true or a timeout elapses
@@ -272,12 +271,12 @@ do { \
({ \
long __ret = timeout; \
if (!(condition)) \
- __wait_event_timeout(wq, condition, __ret); \
+ __ret = __wait_event_timeout(wq, condition, timeout); \
__ret; \
})

-#define __wait_event_interruptible(wq, condition, ret) \
- ___wait_event(wq, condition, TASK_INTERRUPTIBLE, 0, ret, \
+#define __wait_event_interruptible(wq, condition) \
+ ___wait_event(wq, condition, TASK_INTERRUPTIBLE, 0, 0, \
schedule())

/**
@@ -299,14 +298,14 @@ do { \
({ \
int __ret = 0; \
if (!(condition)) \
- __wait_event_interruptible(wq, condition, __ret); \
+ __ret = __wait_event_interruptible(wq, condition); \
__ret; \
})

-#define __wait_event_interruptible_timeout(wq, condition, ret) \
- ___wait_event(wq, ___wait_cond_timeout(condition, ret), \
- TASK_INTERRUPTIBLE, 0, ret, \
- ret = schedule_timeout(ret))
+#define __wait_event_interruptible_timeout(wq, condition, timeout) \
+ ___wait_event(wq, ___wait_cond_timeout(condition), \
+ TASK_INTERRUPTIBLE, 0, timeout, \
+ __ret = schedule_timeout(__ret))

/**
* wait_event_interruptible_timeout - sleep until a condition gets true or a timeout elapses
@@ -330,7 +329,8 @@ do { \
({ \
long __ret = timeout; \
if (!(condition)) \
- __wait_event_interruptible_timeout(wq, condition, __ret); \
+ __ret = __wait_event_interruptible_timeout(wq, \
+ condition, timeout); \
__ret; \
})

@@ -347,7 +347,7 @@ do { \
current->timer_slack_ns, \
HRTIMER_MODE_REL); \
\
- ___wait_event(wq, condition, state, 0, __ret, \
+ __ret = ___wait_event(wq, condition, state, 0, 0, \
if (!__t.task) { \
__ret = -ETIME; \
break; \
@@ -409,15 +409,15 @@ do { \
__ret; \
})

-#define __wait_event_interruptible_exclusive(wq, condition, ret) \
- ___wait_event(wq, condition, TASK_INTERRUPTIBLE, 1, ret, \
+#define __wait_event_interruptible_exclusive(wq, condition) \
+ ___wait_event(wq, condition, TASK_INTERRUPTIBLE, 1, 0, \
schedule())

#define wait_event_interruptible_exclusive(wq, condition) \
({ \
int __ret = 0; \
if (!(condition)) \
- __wait_event_interruptible_exclusive(wq, condition, __ret);\
+ __ret = __wait_event_interruptible_exclusive(wq, condition);\
__ret; \
})

@@ -570,8 +570,8 @@ do { \



-#define __wait_event_killable(wq, condition, ret) \
- ___wait_event(wq, condition, TASK_KILLABLE, 0, ret, schedule())
+#define __wait_event_killable(wq, condition) \
+ ___wait_event(wq, condition, TASK_KILLABLE, 0, 0, schedule())

/**
* wait_event_killable - sleep until a condition gets true
@@ -592,18 +592,17 @@ do { \
({ \
int __ret = 0; \
if (!(condition)) \
- __wait_event_killable(wq, condition, __ret); \
+ __ret = __wait_event_killable(wq, condition); \
__ret; \
})


#define __wait_event_lock_irq(wq, condition, lock, cmd) \
- ___wait_event(wq, condition, TASK_UNINTERRUPTIBLE, 0, \
- ___wait_nop_ret, \
- spin_unlock_irq(&lock); \
- cmd; \
- schedule(); \
- spin_lock_irq(&lock))
+ (void)___wait_event(wq, condition, TASK_UNINTERRUPTIBLE, 0, 0, \
+ spin_unlock_irq(&lock); \
+ cmd; \
+ schedule(); \
+ spin_lock_irq(&lock))

/**
* wait_event_lock_irq_cmd - sleep until a condition gets true. The
@@ -663,11 +662,11 @@ do { \
} while (0)


-#define __wait_event_interruptible_lock_irq(wq, condition, lock, ret, cmd) \
- ___wait_event(wq, condition, TASK_INTERRUPTIBLE, 0, ret, \
- spin_unlock_irq(&lock); \
- cmd; \
- schedule(); \
+#define __wait_event_interruptible_lock_irq(wq, condition, lock, cmd) \
+ ___wait_event(wq, condition, TASK_INTERRUPTIBLE, 0, 0, \
+ spin_unlock_irq(&lock); \
+ cmd; \
+ schedule(); \
spin_lock_irq(&lock))

/**
@@ -698,10 +697,9 @@ do { \
#define wait_event_interruptible_lock_irq_cmd(wq, condition, lock, cmd) \
({ \
int __ret = 0; \
- \
if (!(condition)) \
- __wait_event_interruptible_lock_irq(wq, condition, \
- lock, __ret, cmd); \
+ __ret = __wait_event_interruptible_lock_irq(wq, \
+ condition, lock, cmd); \
__ret; \
})

@@ -730,18 +728,18 @@ do { \
#define wait_event_interruptible_lock_irq(wq, condition, lock) \
({ \
int __ret = 0; \
- \
if (!(condition)) \
- __wait_event_interruptible_lock_irq(wq, condition, \
- lock, __ret, ); \
+ __ret = __wait_event_interruptible_lock_irq(wq, \
+ condition, lock,) \
__ret; \
})

-#define __wait_event_interruptible_lock_irq_timeout(wq, condition, lock, ret) \
- ___wait_event(wq, ___wait_cond_timeout(condition, ret), \
- TASK_INTERRUPTIBLE, 0, ret, \
- spin_unlock_irq(&lock); \
- ret = schedule_timeout(ret); \
+#define __wait_event_interruptible_lock_irq_timeout(wq, condition, \
+ lock, timeout) \
+ ___wait_event(wq, ___wait_cond_timeout(condition), \
+ TASK_INTERRUPTIBLE, 0, ret, \
+ spin_unlock_irq(&lock); \
+ __ret = schedule_timeout(__ret); \
spin_lock_irq(&lock));

/**
@@ -771,11 +769,10 @@ do { \
#define wait_event_interruptible_lock_irq_timeout(wq, condition, lock, \
timeout) \
({ \
- int __ret = timeout; \
- \
+ long __ret = timeout; \
if (!(condition)) \
- __wait_event_interruptible_lock_irq_timeout( \
- wq, condition, lock, __ret); \
+ __ret = __wait_event_interruptible_lock_irq_timeout( \
+ wq, condition, lock, timeout); \
__ret; \
})

--- a/net/irda/af_irda.c
+++ b/net/irda/af_irda.c
@@ -2563,9 +2563,8 @@ static int irda_getsockopt(struct socket
jiffies + msecs_to_jiffies(val));

/* Wait for IR-LMP to call us back */
- __wait_event_interruptible(self->query_wait,
- (self->cachedaddr != 0 || self->errno == -ETIME),
- err);
+ err = __wait_event_interruptible(self->query_wait,
+ (self->cachedaddr != 0 || self->errno == -ETIME));

/* If watchdog is still activated, kill it! */
del_timer(&(self->watchdog));
--- a/net/netfilter/ipvs/ip_vs_sync.c
+++ b/net/netfilter/ipvs/ip_vs_sync.c
@@ -1637,12 +1637,9 @@ static int sync_thread_master(void *data
continue;
}
while (ip_vs_send_sync_msg(tinfo->sock, sb->mesg) < 0) {
- int ret = 0;
-
- __wait_event_interruptible(*sk_sleep(sk),
+ int ret = __wait_event_interruptible(*sk_sleep(sk),
sock_writeable(sk) ||
- kthread_should_stop(),
- ret);
+ kthread_should_stop());
if (unlikely(kthread_should_stop()))
goto done;
}



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