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Commit f3b0cfa9 authored by Linus Torvalds's avatar Linus Torvalds
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Merge branch 'core-futexes-for-linus' of... 

Merge branch 'core-futexes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'core-futexes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  futex: Add futex_q static initializer
  futex: Replace fshared and clockrt with combined flags
  futex: Cleanup stale fshared flag interfaces
parents 2af49b60 5bdb05f9
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Showing with 110 additions and 125 deletions
kernel/futex.c
View file @ f3b0cfa9
......@@ -68,6 +68,14 @@ int __read_mostly futex_cmpxchg_enabled;
#define FUTEX_HASHBITS (CONFIG_BASE_SMALL ? 4 : 8)
/*
* Futex flags used to encode options to functions and preserve them across
* restarts.
*/
#define FLAGS_SHARED 0x01
#define FLAGS_CLOCKRT 0x02
#define FLAGS_HAS_TIMEOUT 0x04
/*
* Priority Inheritance state:
*/
......@@ -123,6 +131,12 @@ struct futex_q {
u32 bitset;
};
static const struct futex_q futex_q_init = {
/* list gets initialized in queue_me()*/
.key = FUTEX_KEY_INIT,
.bitset = FUTEX_BITSET_MATCH_ANY
};
/*
* Hash buckets are shared by all the futex_keys that hash to the same
* location. Each key may have multiple futex_q structures, one for each task
......@@ -283,8 +297,7 @@ get_futex_key(u32 __user *uaddr, int fshared, union futex_key *key)
return 0;
}
static inline
void put_futex_key(int fshared, union futex_key *key)
static inline void put_futex_key(union futex_key *key)
{
drop_futex_key_refs(key);
}
......@@ -870,7 +883,8 @@ double_unlock_hb(struct futex_hash_bucket *hb1, struct futex_hash_bucket *hb2)
/*
* Wake up waiters matching bitset queued on this futex (uaddr).
*/
static int futex_wake(u32 __user *uaddr, int fshared, int nr_wake, u32 bitset)
static int
futex_wake(u32 __user *uaddr, unsigned int flags, int nr_wake, u32 bitset)
{
struct futex_hash_bucket *hb;
struct futex_q *this, *next;
......@@ -881,7 +895,7 @@ static int futex_wake(u32 __user *uaddr, int fshared, int nr_wake, u32 bitset)
if (!bitset)
return -EINVAL;
ret = get_futex_key(uaddr, fshared, &key);
ret = get_futex_key(uaddr, flags & FLAGS_SHARED, &key);
if (unlikely(ret != 0))
goto out;
......@@ -907,7 +921,7 @@ static int futex_wake(u32 __user *uaddr, int fshared, int nr_wake, u32 bitset)
}
spin_unlock(&hb->lock);
put_futex_key(fshared, &key);
put_futex_key(&key);
out:
return ret;
}
......@@ -917,7 +931,7 @@ static int futex_wake(u32 __user *uaddr, int fshared, int nr_wake, u32 bitset)
* to this virtual address:
*/
static int
futex_wake_op(u32 __user *uaddr1, int fshared, u32 __user *uaddr2,
futex_wake_op(u32 __user *uaddr1, unsigned int flags, u32 __user *uaddr2,
int nr_wake, int nr_wake2, int op)
{
union futex_key key1 = FUTEX_KEY_INIT, key2 = FUTEX_KEY_INIT;
......@@ -927,10 +941,10 @@ futex_wake_op(u32 __user *uaddr1, int fshared, u32 __user *uaddr2,
int ret, op_ret;
retry:
ret = get_futex_key(uaddr1, fshared, &key1);
ret = get_futex_key(uaddr1, flags & FLAGS_SHARED, &key1);
if (unlikely(ret != 0))
goto out;
ret = get_futex_key(uaddr2, fshared, &key2);
ret = get_futex_key(uaddr2, flags & FLAGS_SHARED, &key2);
if (unlikely(ret != 0))
goto out_put_key1;
......@@ -962,11 +976,11 @@ futex_wake_op(u32 __user *uaddr1, int fshared, u32 __user *uaddr2,
if (ret)
goto out_put_keys;
if (!fshared)
if (!(flags & FLAGS_SHARED))
goto retry_private;
put_futex_key(fshared, &key2);
put_futex_key(fshared, &key1);
put_futex_key(&key2);
put_futex_key(&key1);
goto retry;
}
......@@ -996,9 +1010,9 @@ futex_wake_op(u32 __user *uaddr1, int fshared, u32 __user *uaddr2,
double_unlock_hb(hb1, hb2);
out_put_keys:
put_futex_key(fshared, &key2);
put_futex_key(&key2);
out_put_key1:
put_futex_key(fshared, &key1);
put_futex_key(&key1);
out:
return ret;
}
......@@ -1133,7 +1147,7 @@ static int futex_proxy_trylock_atomic(u32 __user *pifutex,
/**
* futex_requeue() - Requeue waiters from uaddr1 to uaddr2
* @uaddr1: source futex user address
* @fshared: 0 for a PROCESS_PRIVATE futex, 1 for PROCESS_SHARED
* @flags: futex flags (FLAGS_SHARED, etc.)
* @uaddr2: target futex user address
* @nr_wake: number of waiters to wake (must be 1 for requeue_pi)
* @nr_requeue: number of waiters to requeue (0-INT_MAX)
......@@ -1148,9 +1162,9 @@ static int futex_proxy_trylock_atomic(u32 __user *pifutex,
* >=0 - on success, the number of tasks requeued or woken
* <0 - on error
*/
static int futex_requeue(u32 __user *uaddr1, int fshared, u32 __user *uaddr2,
int nr_wake, int nr_requeue, u32 *cmpval,
int requeue_pi)
static int futex_requeue(u32 __user *uaddr1, unsigned int flags,
u32 __user *uaddr2, int nr_wake, int nr_requeue,
u32 *cmpval, int requeue_pi)
{
union futex_key key1 = FUTEX_KEY_INIT, key2 = FUTEX_KEY_INIT;
int drop_count = 0, task_count = 0, ret;
......@@ -1191,10 +1205,10 @@ static int futex_requeue(u32 __user *uaddr1, int fshared, u32 __user *uaddr2,
pi_state = NULL;
}
ret = get_futex_key(uaddr1, fshared, &key1);
ret = get_futex_key(uaddr1, flags & FLAGS_SHARED, &key1);
if (unlikely(ret != 0))
goto out;
ret = get_futex_key(uaddr2, fshared, &key2);
ret = get_futex_key(uaddr2, flags & FLAGS_SHARED, &key2);
if (unlikely(ret != 0))
goto out_put_key1;
......@@ -1216,11 +1230,11 @@ static int futex_requeue(u32 __user *uaddr1, int fshared, u32 __user *uaddr2,
if (ret)
goto out_put_keys;
if (!fshared)
if (!(flags & FLAGS_SHARED))
goto retry_private;
put_futex_key(fshared, &key2);
put_futex_key(fshared, &key1);
put_futex_key(&key2);
put_futex_key(&key1);
goto retry;
}
if (curval != *cmpval) {
......@@ -1260,8 +1274,8 @@ static int futex_requeue(u32 __user *uaddr1, int fshared, u32 __user *uaddr2,
break;
case -EFAULT:
double_unlock_hb(hb1, hb2);
put_futex_key(fshared, &key2);
put_futex_key(fshared, &key1);
put_futex_key(&key2);
put_futex_key(&key1);
ret = fault_in_user_writeable(uaddr2);
if (!ret)
goto retry;
......@@ -1269,8 +1283,8 @@ static int futex_requeue(u32 __user *uaddr1, int fshared, u32 __user *uaddr2,
case -EAGAIN:
/* The owner was exiting, try again. */
double_unlock_hb(hb1, hb2);
put_futex_key(fshared, &key2);
put_futex_key(fshared, &key1);
put_futex_key(&key2);
put_futex_key(&key1);
cond_resched();
goto retry;
default:
......@@ -1352,9 +1366,9 @@ static int futex_requeue(u32 __user *uaddr1, int fshared, u32 __user *uaddr2,
drop_futex_key_refs(&key1);
out_put_keys:
put_futex_key(fshared, &key2);
put_futex_key(&key2);
out_put_key1:
put_futex_key(fshared, &key1);
put_futex_key(&key1);
out:
if (pi_state != NULL)
free_pi_state(pi_state);
......@@ -1494,7 +1508,7 @@ static void unqueue_me_pi(struct futex_q *q)
* private futexes.
*/
static int fixup_pi_state_owner(u32 __user *uaddr, struct futex_q *q,
struct task_struct *newowner, int fshared)
struct task_struct *newowner)
{
u32 newtid = task_pid_vnr(newowner) | FUTEX_WAITERS;
struct futex_pi_state *pi_state = q->pi_state;
......@@ -1587,20 +1601,11 @@ static int fixup_pi_state_owner(u32 __user *uaddr, struct futex_q *q,
goto retry;
}
/*
* In case we must use restart_block to restart a futex_wait,
* we encode in the 'flags' shared capability
*/
#define FLAGS_SHARED 0x01
#define FLAGS_CLOCKRT 0x02
#define FLAGS_HAS_TIMEOUT 0x04
static long futex_wait_restart(struct restart_block *restart);
/**
* fixup_owner() - Post lock pi_state and corner case management
* @uaddr: user address of the futex
* @fshared: whether the futex is shared (1) or not (0)
* @q: futex_q (contains pi_state and access to the rt_mutex)
* @locked: if the attempt to take the rt_mutex succeeded (1) or not (0)
*
......@@ -1613,8 +1618,7 @@ static long futex_wait_restart(struct restart_block *restart);
* 0 - success, lock not taken
* <0 - on error (-EFAULT)
*/
static int fixup_owner(u32 __user *uaddr, int fshared, struct futex_q *q,
int locked)
static int fixup_owner(u32 __user *uaddr, struct futex_q *q, int locked)
{
struct task_struct *owner;
int ret = 0;
......@@ -1625,7 +1629,7 @@ static int fixup_owner(u32 __user *uaddr, int fshared, struct futex_q *q,
* did a lock-steal - fix up the PI-state in that case:
*/
if (q->pi_state->owner != current)
ret = fixup_pi_state_owner(uaddr, q, current, fshared);
ret = fixup_pi_state_owner(uaddr, q, current);
goto out;
}
......@@ -1652,7 +1656,7 @@ static int fixup_owner(u32 __user *uaddr, int fshared, struct futex_q *q,
* lock. Fix the state up.
*/
owner = rt_mutex_owner(&q->pi_state->pi_mutex);
ret = fixup_pi_state_owner(uaddr, q, owner, fshared);
ret = fixup_pi_state_owner(uaddr, q, owner);
goto out;
}
......@@ -1715,7 +1719,7 @@ static void futex_wait_queue_me(struct futex_hash_bucket *hb, struct futex_q *q,
* futex_wait_setup() - Prepare to wait on a futex
* @uaddr: the futex userspace address
* @val: the expected value
* @fshared: whether the futex is shared (1) or not (0)
* @flags: futex flags (FLAGS_SHARED, etc.)
* @q: the associated futex_q
* @hb: storage for hash_bucket pointer to be returned to caller
*
......@@ -1728,7 +1732,7 @@ static void futex_wait_queue_me(struct futex_hash_bucket *hb, struct futex_q *q,
* 0 - uaddr contains val and hb has been locked
* <1 - -EFAULT or -EWOULDBLOCK (uaddr does not contain val) and hb is unlcoked
*/
static int futex_wait_setup(u32 __user *uaddr, u32 val, int fshared,
static int futex_wait_setup(u32 __user *uaddr, u32 val, unsigned int flags,
struct futex_q *q, struct futex_hash_bucket **hb)
{
u32 uval;
......@@ -1752,8 +1756,7 @@ static int futex_wait_setup(u32 __user *uaddr, u32 val, int fshared,
* rare, but normal.
*/
retry:
q->key = FUTEX_KEY_INIT;
ret = get_futex_key(uaddr, fshared, &q->key);
ret = get_futex_key(uaddr, flags & FLAGS_SHARED, &q->key);
if (unlikely(ret != 0))
return ret;
......@@ -1769,10 +1772,10 @@ static int futex_wait_setup(u32 __user *uaddr, u32 val, int fshared,
if (ret)
goto out;
if (!fshared)
if (!(flags & FLAGS_SHARED))
goto retry_private;
put_futex_key(fshared, &q->key);
put_futex_key(&q->key);
goto retry;
}
......@@ -1783,32 +1786,29 @@ static int futex_wait_setup(u32 __user *uaddr, u32 val, int fshared,
out:
if (ret)
put_futex_key(fshared, &q->key);
put_futex_key(&q->key);
return ret;
}
static int futex_wait(u32 __user *uaddr, int fshared,
u32 val, ktime_t *abs_time, u32 bitset, int clockrt)
static int futex_wait(u32 __user *uaddr, unsigned int flags, u32 val,
ktime_t *abs_time, u32 bitset)
{
struct hrtimer_sleeper timeout, *to = NULL;
struct restart_block *restart;
struct futex_hash_bucket *hb;
struct futex_q q;
struct futex_q q = futex_q_init;
int ret;
if (!bitset)
return -EINVAL;
q.pi_state = NULL;
q.bitset = bitset;
q.rt_waiter = NULL;
q.requeue_pi_key = NULL;
if (abs_time) {
to = &timeout;
hrtimer_init_on_stack(&to->timer, clockrt ? CLOCK_REALTIME :
CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
hrtimer_init_on_stack(&to->timer, (flags & FLAGS_CLOCKRT) ?
CLOCK_REALTIME : CLOCK_MONOTONIC,
HRTIMER_MODE_ABS);
hrtimer_init_sleeper(to, current);
hrtimer_set_expires_range_ns(&to->timer, *abs_time,
current->timer_slack_ns);
......@@ -1819,7 +1819,7 @@ static int futex_wait(u32 __user *uaddr, int fshared,
* Prepare to wait on uaddr. On success, holds hb lock and increments
* q.key refs.
*/
ret = futex_wait_setup(uaddr, val, fshared, &q, &hb);
ret = futex_wait_setup(uaddr, val, flags, &q, &hb);
if (ret)
goto out;
......@@ -1852,12 +1852,7 @@ static int futex_wait(u32 __user *uaddr, int fshared,
restart->futex.val = val;
restart->futex.time = abs_time->tv64;
restart->futex.bitset = bitset;
restart->futex.flags = FLAGS_HAS_TIMEOUT;
if (fshared)
restart->futex.flags |= FLAGS_SHARED;
if (clockrt)
restart->futex.flags |= FLAGS_CLOCKRT;
restart->futex.flags = flags;
ret = -ERESTART_RESTARTBLOCK;
......@@ -1873,7 +1868,6 @@ static int futex_wait(u32 __user *uaddr, int fshared,
static long futex_wait_restart(struct restart_block *restart)
{
u32 __user *uaddr = restart->futex.uaddr;
int fshared = 0;
ktime_t t, *tp = NULL;
if (restart->futex.flags & FLAGS_HAS_TIMEOUT) {
......@@ -1881,11 +1875,9 @@ static long futex_wait_restart(struct restart_block *restart)
tp = &t;
}
restart->fn = do_no_restart_syscall;
if (restart->futex.flags & FLAGS_SHARED)
fshared = 1;
return (long)futex_wait(uaddr, fshared, restart->futex.val, tp,
restart->futex.bitset,
restart->futex.flags & FLAGS_CLOCKRT);
return (long)futex_wait(uaddr, restart->futex.flags,
restart->futex.val, tp, restart->futex.bitset);
}
......@@ -1895,12 +1887,12 @@ static long futex_wait_restart(struct restart_block *restart)
* if there are waiters then it will block, it does PI, etc. (Due to
* races the kernel might see a 0 value of the futex too.)
*/
static int futex_lock_pi(u32 __user *uaddr, int fshared,
int detect, ktime_t *time, int trylock)
static int futex_lock_pi(u32 __user *uaddr, unsigned int flags, int detect,
ktime_t *time, int trylock)
{
struct hrtimer_sleeper timeout, *to = NULL;
struct futex_hash_bucket *hb;
struct futex_q q;
struct futex_q q = futex_q_init;
int res, ret;
if (refill_pi_state_cache())
......@@ -1914,12 +1906,8 @@ static int futex_lock_pi(u32 __user *uaddr, int fshared,
hrtimer_set_expires(&to->timer, *time);
}
q.pi_state = NULL;
q.rt_waiter = NULL;
q.requeue_pi_key = NULL;
retry:
q.key = FUTEX_KEY_INIT;
ret = get_futex_key(uaddr, fshared, &q.key);
ret = get_futex_key(uaddr, flags & FLAGS_SHARED, &q.key);
if (unlikely(ret != 0))
goto out;
......@@ -1941,7 +1929,7 @@ static int futex_lock_pi(u32 __user *uaddr, int fshared,
* exit to complete.
*/
queue_unlock(&q, hb);
put_futex_key(fshared, &q.key);
put_futex_key(&q.key);
cond_resched();
goto retry;
default:
......@@ -1971,7 +1959,7 @@ static int futex_lock_pi(u32 __user *uaddr, int fshared,
* Fixup the pi_state owner and possibly acquire the lock if we
* haven't already.
*/
res = fixup_owner(uaddr, fshared, &q, !ret);
res = fixup_owner(uaddr, &q, !ret);
/*
* If fixup_owner() returned an error, proprogate that. If it acquired
* the lock, clear our -ETIMEDOUT or -EINTR.
......@@ -1995,7 +1983,7 @@ static int futex_lock_pi(u32 __user *uaddr, int fshared,
queue_unlock(&q, hb);
out_put_key:
put_futex_key(fshared, &q.key);
put_futex_key(&q.key);
out:
if (to)
destroy_hrtimer_on_stack(&to->timer);
......@@ -2008,10 +1996,10 @@ static int futex_lock_pi(u32 __user *uaddr, int fshared,
if (ret)
goto out_put_key;
if (!fshared)
if (!(flags & FLAGS_SHARED))
goto retry_private;
put_futex_key(fshared, &q.key);
put_futex_key(&q.key);
goto retry;
}
......@@ -2020,7 +2008,7 @@ static int futex_lock_pi(u32 __user *uaddr, int fshared,
* This is the in-kernel slowpath: we look up the PI state (if any),
* and do the rt-mutex unlock.
*/
static int futex_unlock_pi(u32 __user *uaddr, int fshared)
static int futex_unlock_pi(u32 __user *uaddr, unsigned int flags)
{
struct futex_hash_bucket *hb;
struct futex_q *this, *next;
......@@ -2038,7 +2026,7 @@ static int futex_unlock_pi(u32 __user *uaddr, int fshared)
if ((uval & FUTEX_TID_MASK) != task_pid_vnr(current))
return -EPERM;
ret = get_futex_key(uaddr, fshared, &key);
ret = get_futex_key(uaddr, flags & FLAGS_SHARED, &key);
if (unlikely(ret != 0))
goto out;
......@@ -2093,14 +2081,14 @@ static int futex_unlock_pi(u32 __user *uaddr, int fshared)
out_unlock:
spin_unlock(&hb->lock);
put_futex_key(fshared, &key);
put_futex_key(&key);
out:
return ret;
pi_faulted:
spin_unlock(&hb->lock);
put_futex_key(fshared, &key);
put_futex_key(&key);
ret = fault_in_user_writeable(uaddr);
if (!ret)
......@@ -2160,7 +2148,7 @@ int handle_early_requeue_pi_wakeup(struct futex_hash_bucket *hb,
/**
* futex_wait_requeue_pi() - Wait on uaddr and take uaddr2
* @uaddr: the futex we initially wait on (non-pi)
* @fshared: whether the futexes are shared (1) or not (0). They must be
* @flags: futex flags (FLAGS_SHARED, FLAGS_CLOCKRT, etc.), they must be
* the same type, no requeueing from private to shared, etc.
* @val: the expected value of uaddr
* @abs_time: absolute timeout
......@@ -2198,16 +2186,16 @@ int handle_early_requeue_pi_wakeup(struct futex_hash_bucket *hb,
* 0 - On success
* <0 - On error
*/
static int futex_wait_requeue_pi(u32 __user *uaddr, int fshared,
static int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags,
u32 val, ktime_t *abs_time, u32 bitset,
int clockrt, u32 __user *uaddr2)
u32 __user *uaddr2)
{
struct hrtimer_sleeper timeout, *to = NULL;
struct rt_mutex_waiter rt_waiter;
struct rt_mutex *pi_mutex = NULL;
struct futex_hash_bucket *hb;
union futex_key key2;
struct futex_q q;
union futex_key key2 = FUTEX_KEY_INIT;
struct futex_q q = futex_q_init;
int res, ret;
if (!bitset)
......@@ -2215,8 +2203,9 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, int fshared,
if (abs_time) {
to = &timeout;
hrtimer_init_on_stack(&to->timer, clockrt ? CLOCK_REALTIME :
CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
hrtimer_init_on_stack(&to->timer, (flags & FLAGS_CLOCKRT) ?
CLOCK_REALTIME : CLOCK_MONOTONIC,
HRTIMER_MODE_ABS);
hrtimer_init_sleeper(to, current);
hrtimer_set_expires_range_ns(&to->timer, *abs_time,
current->timer_slack_ns);
......@@ -2229,12 +2218,10 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, int fshared,
debug_rt_mutex_init_waiter(&rt_waiter);
rt_waiter.task = NULL;
key2 = FUTEX_KEY_INIT;
ret = get_futex_key(uaddr2, fshared, &key2);
ret = get_futex_key(uaddr2, flags & FLAGS_SHARED, &key2);
if (unlikely(ret != 0))
goto out;
q.pi_state = NULL;
q.bitset = bitset;
q.rt_waiter = &rt_waiter;
q.requeue_pi_key = &key2;
......@@ -2243,7 +2230,7 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, int fshared,
* Prepare to wait on uaddr. On success, increments q.key (key1) ref
* count.
*/
ret = futex_wait_setup(uaddr, val, fshared, &q, &hb);
ret = futex_wait_setup(uaddr, val, flags, &q, &hb);
if (ret)
goto out_key2;
......@@ -2273,8 +2260,7 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, int fshared,
*/
if (q.pi_state && (q.pi_state->owner != current)) {
spin_lock(q.lock_ptr);
ret = fixup_pi_state_owner(uaddr2, &q, current,
fshared);
ret = fixup_pi_state_owner(uaddr2, &q, current);
spin_unlock(q.lock_ptr);
}
} else {
......@@ -2293,7 +2279,7 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, int fshared,
* Fixup the pi_state owner and possibly acquire the lock if we
* haven't already.
*/
res = fixup_owner(uaddr2, fshared, &q, !ret);
res = fixup_owner(uaddr2, &q, !ret);
/*
* If fixup_owner() returned an error, proprogate that. If it
* acquired the lock, clear -ETIMEDOUT or -EINTR.
......@@ -2324,9 +2310,9 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, int fshared,
}
out_put_keys:
put_futex_key(fshared, &q.key);
put_futex_key(&q.key);
out_key2:
put_futex_key(fshared, &key2);
put_futex_key(&key2);
out:
if (to) {
......@@ -2551,58 +2537,57 @@ void exit_robust_list(struct task_struct *curr)
long do_futex(u32 __user *uaddr, int op, u32 val, ktime_t *timeout,
u32 __user *uaddr2, u32 val2, u32 val3)
{
int clockrt, ret = -ENOSYS;
int cmd = op & FUTEX_CMD_MASK;
int fshared = 0;
int ret = -ENOSYS, cmd = op & FUTEX_CMD_MASK;
unsigned int flags = 0;
if (!(op & FUTEX_PRIVATE_FLAG))
fshared = 1;
flags |= FLAGS_SHARED;
clockrt = op & FUTEX_CLOCK_REALTIME;
if (clockrt && cmd != FUTEX_WAIT_BITSET && cmd != FUTEX_WAIT_REQUEUE_PI)
if (op & FUTEX_CLOCK_REALTIME) {
flags |= FLAGS_CLOCKRT;
if (cmd != FUTEX_WAIT_BITSET && cmd != FUTEX_WAIT_REQUEUE_PI)
return -ENOSYS;
}
switch (cmd) {
case FUTEX_WAIT:
val3 = FUTEX_BITSET_MATCH_ANY;
case FUTEX_WAIT_BITSET:
ret = futex_wait(uaddr, fshared, val, timeout, val3, clockrt);
ret = futex_wait(uaddr, flags, val, timeout, val3);
break;
case FUTEX_WAKE:
val3 = FUTEX_BITSET_MATCH_ANY;
case FUTEX_WAKE_BITSET:
ret = futex_wake(uaddr, fshared, val, val3);
ret = futex_wake(uaddr, flags, val, val3);
break;
case FUTEX_REQUEUE:
ret = futex_requeue(uaddr, fshared, uaddr2, val, val2, NULL, 0);
ret = futex_requeue(uaddr, flags, uaddr2, val, val2, NULL, 0);
break;
case FUTEX_CMP_REQUEUE:
ret = futex_requeue(uaddr, fshared, uaddr2, val, val2, &val3,
0);
ret = futex_requeue(uaddr, flags, uaddr2, val, val2, &val3, 0);
break;
case FUTEX_WAKE_OP:
ret = futex_wake_op(uaddr, fshared, uaddr2, val, val2, val3);
ret = futex_wake_op(uaddr, flags, uaddr2, val, val2, val3);
break;
case FUTEX_LOCK_PI:
if (futex_cmpxchg_enabled)
ret = futex_lock_pi(uaddr, fshared, val, timeout, 0);
ret = futex_lock_pi(uaddr, flags, val, timeout, 0);
break;
case FUTEX_UNLOCK_PI:
if (futex_cmpxchg_enabled)
ret = futex_unlock_pi(uaddr, fshared);
ret = futex_unlock_pi(uaddr, flags);
break;
case FUTEX_TRYLOCK_PI:
if (futex_cmpxchg_enabled)
ret = futex_lock_pi(uaddr, fshared, 0, timeout, 1);
ret = futex_lock_pi(uaddr, flags, 0, timeout, 1);
break;
case FUTEX_WAIT_REQUEUE_PI:
val3 = FUTEX_BITSET_MATCH_ANY;
ret = futex_wait_requeue_pi(uaddr, fshared, val, timeout, val3,
clockrt, uaddr2);
ret = futex_wait_requeue_pi(uaddr, flags, val, timeout, val3,
uaddr2);
break;
case FUTEX_CMP_REQUEUE_PI:
ret = futex_requeue(uaddr, fshared, uaddr2, val, val2, &val3,
1);
ret = futex_requeue(uaddr, flags, uaddr2, val, val2, &val3, 1);
break;
default:
ret = -ENOSYS;
......
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