/** * wake_up_bit - wake up a waiter on a bit * @word: the word being waited on, a kernel virtual address * @bit: the bit of the word being waited on * * There is a standard hashed waitqueue table for generic use. This * is the part of the hashtable's accessor API that wakes up waiters * on a bit. For instance, if one were to have waiters on a bitflag, * one would call wake_up_bit() after clearing the bit. * * In order for this to function properly, as it uses waitqueue_active() * internally, some kind of memory barrier must be done prior to calling * this. Typically, this will be smp_mb__after_clear_bit(), but in some * cases where bitflags are manipulated non-atomically under a lock, one * may need to use a less regular barrier, such fs/inode.c's smp_mb(), * because spin_unlock() does not guarantee a memory barrier. */ void wake_up_bit(void *word, int bit) { __wake_up_bit(bit_waitqueue(word, bit), word, bit); }
/** * wake_up_atomic_t - Wake up a waiter on a atomic_t * @word: The word being waited on, a kernel virtual address * @bit: The bit of the word being waited on * * Wake up anyone waiting for the atomic_t to go to zero. * * Abuse the bit-waker function and its waitqueue hash table set (the atomic_t * check is done by the waiter's wake function, not the by the waker itself). */ void wake_up_atomic_t(atomic_t *p) { __wake_up_bit(atomic_t_waitqueue(p), p, WAIT_ATOMIC_T_BIT_NR); }