| /linux-6.15/include/linux/ |
| H A D | rwbase_rt.h | 12 atomic_t readers; member
18 .readers = ATOMIC_INIT(READER_BIAS), \
25 atomic_set(&(rwbase)->readers, READER_BIAS); \
31 return atomic_read(&rwb->readers) != READER_BIAS; in rw_base_is_locked()
36 return atomic_read(&rwb->readers) == WRITER_BIAS; in rw_base_is_write_locked()
41 return atomic_read(&rwb->readers) > 0; in rw_base_is_contended()
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| H A D | rwlock_types.h | 59 atomic_t readers; member
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| /linux-6.15/kernel/locking/ |
| H A D | rwbase_rt.c | 61 for (r = atomic_read(&rwb->readers); r < 0;) { in rwbase_read_trylock()
62 if (likely(atomic_try_cmpxchg_acquire(&rwb->readers, &r, r + 1))) in rwbase_read_trylock()
124 atomic_inc(&rwb->readers); in __rwbase_read_lock()
183 if (unlikely(atomic_dec_and_test(&rwb->readers))) in rwbase_read_unlock()
196 (void)atomic_add_return_release(READER_BIAS - bias, &rwb->readers); in __rwbase_write_unlock()
229 if (!atomic_read_acquire(&rwb->readers)) { in __rwbase_write_trylock()
230 atomic_set(&rwb->readers, WRITER_BIAS); in __rwbase_write_trylock()
248 atomic_sub(READER_BIAS, &rwb->readers); in rwbase_write_lock()
294 atomic_sub(READER_BIAS, &rwb->readers); in rwbase_write_trylock()
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| H A D | rwsem.c | 807 int readers = count >> RWSEM_READER_SHIFT; in rwsem_rspin_threshold() local
810 if (readers > 30) in rwsem_rspin_threshold()
811 readers = 30; in rwsem_rspin_threshold()
812 delta = (20 + readers) * NSEC_PER_USEC / 2; in rwsem_rspin_threshold()
1511 int count = atomic_read(&sem->rwbase.readers); in is_rwsem_reader_owned()
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| /linux-6.15/fs/bcachefs/ |
| H A D | six.c | 163 this_cpu_sub(*lock->readers, !ret); in __do_six_trylock()
576 lock->readers) { in do_six_unlock_type()
578 this_cpu_dec(*lock->readers); in do_six_unlock_type()
671 if (!lock->readers) { in six_lock_tryupgrade()
679 if (lock->readers) in six_lock_tryupgrade()
680 this_cpu_dec(*lock->readers); in six_lock_tryupgrade()
736 if (lock->readers) { in six_lock_increment()
737 this_cpu_inc(*lock->readers); in six_lock_increment()
825 if (lock->readers) { in six_lock_readers_add()
847 free_percpu(lock->readers); in six_lock_exit()
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| /linux-6.15/fs/btrfs/ |
| H A D | locking.c | 316 atomic_set(&lock->readers, 0); in btrfs_drew_lock_init()
325 if (atomic_read(&lock->readers)) in btrfs_drew_try_write_lock()
332 if (atomic_read(&lock->readers)) { in btrfs_drew_try_write_lock()
345 wait_event(lock->pending_writers, !atomic_read(&lock->readers)); in btrfs_drew_write_lock()
361 atomic_inc(&lock->readers); in btrfs_drew_read_lock()
380 if (atomic_dec_and_test(&lock->readers)) in btrfs_drew_read_unlock()
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| /linux-6.15/tools/testing/selftests/kvm/lib/ |
| H A D | userfaultfd_util.c | 125 uffd_desc->readers = calloc(sizeof(pthread_t), num_readers); in uffd_setup_demand_paging()
126 TEST_ASSERT(uffd_desc->readers, "Failed to alloc reader threads"); in uffd_setup_demand_paging()
170 pthread_create(&uffd_desc->readers[i], NULL, uffd_handler_thread_fn, in uffd_setup_demand_paging()
190 TEST_ASSERT(!pthread_join(uffd->readers[i], NULL), in uffd_stop_demand_paging()
201 free(uffd->readers); in uffd_stop_demand_paging()
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| /linux-6.15/drivers/misc/cardreader/ |
| H A D | Kconfig | 9 Alcor Micro card readers support access to many types of memory cards,
21 Realtek card readers support access to many types of memory cards,
30 Select this option to get support for Realtek USB 2.0 card readers
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| /linux-6.15/Documentation/RCU/ |
| H A D | rcu.rst | 10 must be long enough that any readers accessing the item being deleted have
21 The advantage of RCU's two-part approach is that RCU readers need
26 in read-mostly situations. The fact that RCU readers need not
30 if the RCU readers give no indication when they are done?
32 Just as with spinlocks, RCU readers are not permitted to
42 same effect, but require that the readers manipulate CPU-local
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| H A D | checklist.rst | 100 locks (that are acquired by both readers and writers)
101 that guard per-element state. Fields that the readers
107 c. Make updates appear atomic to readers. For example,
111 appear to be atomic to RCU readers, nor will sequences
162 is common to readers and updaters. However, lockdep
247 call_rcu_tasks(), then the readers must refrain from
253 corresponding readers must use rcu_read_lock_trace()
257 then the corresponding readers must use anything that
439 when you need lightweight readers.
459 that readers can follow that could be affected by the
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| H A D | whatisRCU.rst | 81 readers is the semantics of modern CPUs guarantee that readers will see
101 readers cannot gain a reference to it.
103 b. Wait for all previous readers to complete their RCU read-side
111 The ability to wait until all readers are done allows RCU readers to
121 readers. Concurrent RCU readers can then continue accessing the old
228 readers are done, its implementation is key to RCU. For RCU
509 This primitive protects concurrent readers from the updater,
1165 a. Will readers need to block? If so, you need SRCU.
1188 If so, you should disable softirq across your readers, for
1245 allows latency to "bleed" from readers to other
[all …]
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| H A D | lockdep.rst | 43 invoked by both RCU readers and updaters.
47 is invoked by both RCU-bh readers and updaters.
51 is invoked by both RCU-sched readers and updaters.
55 is invoked by both SRCU readers and updaters.
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| H A D | listRCU.rst | 63 ``tasklist_lock``. To prevent readers from noticing changes in the list
67 any readers traversing the list will see valid ``p->tasks.next`` pointers
71 all existing readers finish, which guarantees that the ``task_struct``
73 of all RCU readers that might possibly have a reference to that object.
219 need for writers to exclude readers.
226 readers to fail spectacularly.
228 So, when readers can tolerate stale data and when entries are either added or
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| /linux-6.15/drivers/misc/ibmasm/ |
| H A D | event.c | 30 list_for_each_entry(reader, &sp->event_buffer->readers, node) in wake_up_event_readers()
123 list_add(&reader->node, &sp->event_buffer->readers); in ibmasm_event_reader_register()
153 INIT_LIST_HEAD(&buffer->readers); in ibmasm_event_buffer_init()
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| /linux-6.15/Documentation/locking/ |
| H A D | lockdep-design.rst | 410 r: stands for non-recursive readers.
411 R: stands for recursive readers.
424 The difference between recursive readers and non-recursive readers is because:
426 readers could get blocked by a write lock *waiter*. Considering the follow
442 Block conditions on readers/writers of the same lock instance:
448 3. Writers block both recursive readers and non-recursive readers.
449 4. And readers (recursive or not) don't block other recursive readers but
450 may block non-recursive readers (because of the potential co-existing
465 (W: writers, r: non-recursive readers, R: recursive readers)
527 recursive readers and non-recursive readers for L1 (as they block the same types) and
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| H A D | seqlock.rst | 9 lockless readers (read-only retry loops), and no writer starvation. They
23 is odd and indicates to the readers that an update is in progress. At
25 even again which lets readers make progress.
153 from interruption by readers. This is typically the case when the read
195 1. Normal Sequence readers which never block a writer but they must
206 2. Locking readers which will wait if a writer or another locking reader
218 according to a passed marker. This is used to avoid lockless readers
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| H A D | locktypes.rst | 95 readers.
135 rw_semaphore is a multiple readers and single writer lock mechanism.
141 exist special-purpose interfaces that allow non-owner release for readers.
151 readers, a preempted low-priority reader will continue holding its lock,
152 thus starving even high-priority writers. In contrast, because readers
155 writer from starving readers.
299 rwlock_t is a multiple readers and single writer lock mechanism.
314 readers, a preempted low-priority reader will continue holding its lock,
315 thus starving even high-priority writers. In contrast, because readers
318 preventing that writer from starving readers.
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| /linux-6.15/fs/ |
| H A D | pipe.c | 428 !READ_ONCE(pipe->readers); in pipe_writable()
461 if (!pipe->readers) { in anon_pipe_write()
501 if (!pipe->readers) { in anon_pipe_write()
701 if (!pipe->readers) in pipe_poll()
730 pipe->readers--; in pipe_release()
735 if (!pipe->readers != !pipe->writers) { in pipe_release()
901 pipe->readers = pipe->writers = 1; in get_pipe_inode()
1164 if (pipe->readers++ == 0) in fifo_open()
1193 if (!is_pipe && !pipe->readers) { in fifo_open()
1207 pipe->readers++; in fifo_open()
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| /linux-6.15/drivers/soc/aspeed/ |
| H A D | aspeed-p2a-ctrl.c | 65 u32 readers; member
192 ctrl->readers += 1; in aspeed_p2a_ioctl()
275 priv->parent->readers -= priv->read; in aspeed_p2a_release()
299 if (!open_regions && priv->parent->readers == 0) in aspeed_p2a_release()
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| /linux-6.15/drivers/hid/ |
| H A D | hid-roccat.c | 47 struct list_head readers; member
191 list_add_tail(&reader->node, &device->readers); in roccat_open()
270 list_for_each_entry(reader, &device->readers, node) { in roccat_report_event()
339 INIT_LIST_HEAD(&device->readers); in roccat_connect()
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| /linux-6.15/tools/testing/selftests/kvm/include/ |
| H A D | userfaultfd_util.h | 31 pthread_t *readers; member
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| /linux-6.15/drivers/iio/ |
| H A D | TODO | 14 to state struct and using property handlers and readers.
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| /linux-6.15/drivers/md/dm-vdo/indexer/ |
| H A D | volume-index.c | 806 struct buffered_reader **readers, in start_restoring_volume_sub_index() argument
820 result = uds_read_from_buffered_reader(readers[i], buffer, in start_restoring_volume_sub_index()
873 result = uds_read_from_buffered_reader(readers[i], decoded, in start_restoring_volume_sub_index()
891 result = uds_start_restoring_delta_index(&sub_index->delta_index, readers, in start_restoring_volume_sub_index()
983 struct buffered_reader **readers, unsigned int reader_count) in uds_load_volume_index() argument
988 result = start_restoring_volume_index(volume_index, readers, reader_count); in uds_load_volume_index()
992 result = finish_restoring_volume_index(volume_index, readers, reader_count); in uds_load_volume_index()
999 result = uds_check_guard_delta_lists(readers, reader_count); in uds_load_volume_index()
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| H A D | index-layout.c | 889 struct buffered_reader *readers[MAX_ZONES]; in uds_load_index_state() local
899 result = open_region_reader(layout, &isl->open_chapter, &readers[0]); in uds_load_index_state()
903 result = uds_load_open_chapter(index, readers[0]); in uds_load_index_state()
904 uds_free_buffered_reader(readers[0]); in uds_load_index_state()
910 &readers[zone]); in uds_load_index_state()
913 uds_free_buffered_reader(readers[zone - 1]); in uds_load_index_state()
919 result = uds_load_volume_index(index->volume_index, readers, isl->zone_count); in uds_load_index_state()
921 uds_free_buffered_reader(readers[zone]); in uds_load_index_state()
925 result = open_region_reader(layout, &isl->index_page_map, &readers[0]); in uds_load_index_state()
929 result = uds_read_index_page_map(index->volume->index_page_map, readers[0]); in uds_load_index_state()
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| /linux-6.15/Documentation/trace/ |
| H A D | ring-buffer-map.rst | 43 Concurrent readers (either another application mapping that ring-buffer or the
45 the ring-buffer and the output is unpredictable, just like concurrent readers on
|