Lines Matching +full:use +full:- +full:cases

1 .. SPDX-License-Identifier: GPL-2.0
4 Reference-count design for elements of lists/arrays protected by RCU
8 Please note that the percpu-ref feature is likely your first
10 include/linux/percpu-refcount.h for more information.  However, in
11 those unusual cases where percpu-ref would consume too much memory,
14 ------------------------------------------------------------------------
26 	atomic_set(&el->rc, 1);			atomic_inc(&el->rc);
37 	if(atomic_dec_and_test(&el->rc))	...
42 						if (atomic_dec_and_test(&el->rc))
51 has already been deleted from the list/array.  Use atomic_inc_not_zero()
61 	atomic_set(&el->rc, 1);			if (!atomic_inc_not_zero(&el->rc)) {
72 	if (atomic_dec_and_test(&el->rc))	...
73 	    call_rcu(&el->head, el_free);	remove_element
76 						if (atomic_dec_and_test(&el->rc))
77 						    call_rcu(&el->head, el_free);
82 update (write) stream.	In such cases, atomic_inc_not_zero() might be
83 overkill, since we hold the update-side spinlock.  One might instead
84 use atomic_inc() in such cases.
87 search_and_reference() code path.  In such cases, the
98 	atomic_set(&el->rc, 1);			atomic_inc(&el->rc);
109 	if (atomic_dec_and_test(&el->rc))	spin_unlock(&list_lock);
111 	...					call_rcu(&el->head, el_free);
122 of el->rc cannot increase.  Thus, once it reaches zero, there are no
128 A clear advantage of the RCU-based pattern in listing C over the one
139 In cases where delete() can sleep, synchronize_rcu() can be called from
151 	if (atomic_dec_and_test(&el->rc))