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Implement requeue interface similarly to FUTEX_CMP_REQUEUE operation. This is the syscall implemented by this patch: futex_requeue(struct futex_requeue *rq1, struct futex_requeue *rq2, unsigned int nr_wake, unsigned int nr_requeue, u64 cmpval, unsigned int flags) struct futex_requeue { void *uaddr; unsigned int flags; }; If (rq1->uaddr == cmpval), wake at rq1->uaddr a nr_wake number of waiters and then, remove a number of nr_requeue waiters at rq1->uaddr and add them to rq2->uaddr list. Each uaddr has its own set of flags, that must be defined at struct futex_requeue (such as size, shared, NUMA). The flags argument of the syscall is there just for the sake of extensibility, and right now it needs to be zero. Return the number of the woken futexes + the number of requeued ones on success, error code otherwise. Signed-off-by: André Almeida <andrealmeid@collabora.com>
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