vdo_waitq_num_waiters
num_pages = vdo_waitq_num_waiters(waitq);
cache->waiter_count -= vdo_waitq_num_waiters(&info->waiting);
vdo_waitq_num_waiters(&lock->waiters), lock->agent);
block->entries_in_commit = vdo_waitq_num_waiters(&block->entry_waiters);
vdo_waitq_num_waiters(&block->entry_waiters),
vdo_waitq_num_waiters(&block->commit_waiters));
vdo_waitq_num_waiters(&journal->entry_waiters));
block_count_t write_count = vdo_waitq_num_waiters(&slab->dirty_blocks);
vdo_waitq_num_waiters(&journal->entry_waiters),
vdo_waitq_num_waiters(&slab->dirty_blocks),
vdo_waitq_num_waiters(&scrubber->waiters),