Source of rwsem-xadd.c - linux-imx - PHYTEC BitBucket (Stash)

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         * Ensure calling get_task_struct() before setting the reader
         * waiter to nil such that rwsem_down_read_failed() cannot
         * race with do_exit() by always holding a reference count
         * to the task to wakeup.
         */
        smp_store_release(&waiter->task, NULL);
        /*
         * Ensure issuing the wakeup (either by us or someone else)
         * after setting the reader waiter to nil.
         */
        wake_q_add(wake_q, tsk);
        /* wake_q_add() already take the task ref */
        put_task_struct(tsk);
        wake_q_add_safe(wake_q, tsk);
    }
​
    adjustment = woken * RWSEM_ACTIVE_READ_BIAS - adjustment;
    if (list_empty(&sem->wait_list)) {
        /* hit end of list above */
        adjustment -= RWSEM_WAITING_BIAS;
    }
​
    if (adjustment)
        atomic_long_add(adjustment, &sem->count);