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1 /* SPDX-License-Identifier: GPL-2.0-or-later */
13  *      2009-Nov-6: Initial version by Darren Hart <dvhart@linux.intel.com>
28 /* Define the newer op codes if the system header file is not up to date. */
51  * futex() - SYS_futex syscall wrapper
59  * @opflags:	flags to be bitwise OR'd with op, such as FUTEX_PRIVATE_FLAG
68  * like-named arguments in the following wrappers except where noted below.
74  * futex_wait() - block on uaddr with optional timeout
84  * futex_wake() - wake one or more tasks blocked on uaddr
85  * @nr_wake:	wake up to this many tasks
94  * futex_wait_bitset() - block on uaddr with bitset
95  * @bitset:	bitset to be used with futex_wake_bitset
106  * futex_wake_bitset() - wake one or more tasks blocked on uaddr with bitset
107  * @bitset:	bitset to compare with that used in futex_wait_bitset
117  * futex_lock_pi() - block on uaddr as a PI mutex
118  * @detect:	whether (1) or not (0) to perform deadlock detection
128  * futex_unlock_pi() - release uaddr as a PI mutex, waking the top waiter
137  * futex_wake_op() - FIXME: COME UP WITH A GOOD ONE LINE DESCRIPTION
148  * futex_requeue() - requeue without expected value comparison, deprecated
149  * @nr_wake:	wake up to this many tasks
150  * @nr_requeue:	requeue up to this many tasks
152  * Due to its inherently racy implementation, futex_requeue() is deprecated in
164  * futex_cmp_requeue() - requeue tasks from uaddr to uaddr2
165  * @nr_wake:	wake up to this many tasks
166  * @nr_requeue:	requeue up to this many tasks
177  * futex_wait_requeue_pi() - block on uaddr and prepare to requeue to uaddr2
178  * @uaddr:	non-PI futex source
193  * futex_cmp_requeue_pi() - requeue tasks from uaddr to uaddr2 (PI aware)
194  * @uaddr:	non-PI futex source
196  * @nr_wake:	wake up to this many tasks
197  * @nr_requeue:	requeue up to this many tasks
208  * futex_cmpxchg() - atomic compare and exchange
209  * @uaddr:	The address of the futex to be modified
211  * @newval:	The new value to try and assign the futex
214  * http://gcc.gnu.org/onlinedocs/gcc-4.1.0/gcc/Atomic-Builtins.html
225  * futex_dec() - atomic decrement of the futex value
226  * @uaddr:	The address of the futex to be modified
237  * futex_inc() - atomic increment of the futex value
238  * @uaddr:	the address of the futex to be modified
249  * futex_set() - atomic decrement of the futex value
250  * @uaddr:	the address of the futex to be modified