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/linux/drivers/staging/media/atomisp/pci/hive_isp_css_common/host/
A Ddebug_private.h56 if (remote_tail > debug_data_ptr->tail) { in debug_synch_queue()
60 debug_data_ptr->tail * sizeof(uint32_t), in debug_synch_queue()
62 } else if (remote_tail < debug_data_ptr->tail) { in debug_synch_queue()
66 debug_data_ptr->tail * sizeof(uint32_t), in debug_synch_queue()
72 debug_data_ptr->tail = remote_tail; in debug_synch_queue()
80 if (remote_tail > debug_data_ptr->tail) { in debug_synch_queue_isp()
96 debug_data_ptr->tail = remote_tail; in debug_synch_queue_isp()
106 if (remote_tail > debug_data_ptr->tail) { in debug_synch_queue_ddr()
110 debug_data_ptr->tail * sizeof(uint32_t), in debug_synch_queue_ddr()
116 debug_data_ptr->tail * sizeof(uint32_t), in debug_synch_queue_ddr()
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/linux/tools/lib/
A Dlist_sort.c23 *tail = a; in merge()
24 tail = &a->next; in merge()
27 *tail = b; in merge()
31 *tail = b; in merge()
35 *tail = a; in merge()
61 tail = a; in merge_final()
68 tail = b; in merge_final()
78 tail->next = b; in merge_final()
81 tail = b; in merge_final()
209 tail = &(*tail)->prev; in list_sort()
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/linux/lib/
A Dlist_sort.c24 *tail = a; in merge()
25 tail = &a->next; in merge()
28 *tail = b; in merge()
32 *tail = b; in merge()
36 *tail = a; in merge()
63 tail = a; in merge_final()
70 tail = b; in merge_final()
80 tail->next = b; in merge_final()
92 tail = b; in merge_final()
220 tail = &(*tail)->prev; in list_sort()
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/linux/Documentation/translations/zh_CN/core-api/
A Dcircular-buffers.rst55 (2) 'tail'索引 - 消费者在缓冲区中找到下一个元素的位置。
57 通常，当tail指针等于head指针时，表明缓冲区是空的；而当head指针比tail指针少一个时，
60 添加元素时，递增head索引；删除元素时，递增tail索引。tail索引不应该跳过head索引，
111 产者控制着head索引，但消费者可能仍然在另一个CPU上耗尽缓冲区并移动tail索引。
116 者控制着tail索引，但生产者可能仍然在另一个CPU上填充缓冲区并移动head索引。
146 unsigned long tail = READ_ONCE(buffer->tail);
181 unsigned long tail = buffer->tail;
186 struct item *item = buffer[tail];
190 /* 在递增tail之前完成对描述符的读取。 */
191 smp_store_release(buffer->tail,
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/linux/drivers/rpmsg/
A Dqcom_glink_smem.c53 __le32 *tail; member
70 u32 tail; in glink_smem_rx_avail() local
86 tail = le32_to_cpu(*pipe->tail); in glink_smem_rx_avail()
99 u32 tail; in glink_smem_rx_peek() local
101 tail = le32_to_cpu(*pipe->tail); in glink_smem_rx_peek()
118 u32 tail; in glink_smem_rx_advance() local
120 tail = le32_to_cpu(*pipe->tail); in glink_smem_rx_advance()
122 tail += count; in glink_smem_rx_advance()
126 *pipe->tail = cpu_to_le32(tail); in glink_smem_rx_advance()
133 u32 tail; in glink_smem_tx_avail() local
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A Dqcom_glink_rpm.c51 void __iomem *tail; member
73 unsigned int tail; in glink_rpm_rx_avail() local
76 tail = readl(pipe->tail); in glink_rpm_rx_avail()
78 if (head < tail) in glink_rpm_rx_avail()
91 tail = readl(pipe->tail); in glink_rpm_rx_peek()
92 tail += offset; in glink_rpm_rx_peek()
114 tail = readl(pipe->tail); in glink_rpm_rx_advance()
116 tail += count; in glink_rpm_rx_advance()
120 writel(tail, pipe->tail); in glink_rpm_rx_advance()
130 tail = readl(pipe->tail); in glink_rpm_tx_avail()
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/linux/fs/netfs/
A Dmisc.c23 prev = tail; in netfs_buffer_make_space()
25 if (!folioq_full(tail)) in netfs_buffer_make_space()
26 return tail; in netfs_buffer_make_space()
30 tail = kmalloc(sizeof(*tail), GFP_NOFS); in netfs_buffer_make_space()
31 if (!tail) in netfs_buffer_make_space()
34 folioq_init(tail); in netfs_buffer_make_space()
35 tail->prev = prev; in netfs_buffer_make_space()
44 rreq->buffer = tail; in netfs_buffer_make_space()
57 return tail; in netfs_buffer_make_space()
70 if (IS_ERR(tail)) in netfs_buffer_append_folio()
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/linux/drivers/md/dm-vdo/
A Dmurmurhash3.c85 k2 ^= ((u64)tail[14]) << 48; in murmurhash3_128()
100 k2 ^= ((u64)tail[9]) << 8; in murmurhash3_128()
103 k2 ^= ((u64)tail[8]) << 0; in murmurhash3_128()
111 k1 ^= ((u64)tail[7]) << 56; in murmurhash3_128()
114 k1 ^= ((u64)tail[6]) << 48; in murmurhash3_128()
117 k1 ^= ((u64)tail[5]) << 40; in murmurhash3_128()
120 k1 ^= ((u64)tail[4]) << 32; in murmurhash3_128()
123 k1 ^= ((u64)tail[3]) << 24; in murmurhash3_128()
126 k1 ^= ((u64)tail[2]) << 16; in murmurhash3_128()
129 k1 ^= ((u64)tail[1]) << 8; in murmurhash3_128()
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/linux/drivers/infiniband/sw/rdmavt/
A Dcq.c35 u32 tail; in rvt_cq_enter() local
43 tail = RDMA_READ_UAPI_ATOMIC(u_wc->tail); in rvt_cq_enter()
48 tail = k_wc->tail; in rvt_cq_enter()
388 tail = RDMA_READ_UAPI_ATOMIC(old_u_wc->tail); in rvt_resize_cq()
392 tail = old_k_wc->tail; in rvt_resize_cq()
413 tail = 0; in rvt_resize_cq()
415 tail++; in rvt_resize_cq()
484 u32 tail; in rvt_poll_cq() local
493 tail = wc->tail; in rvt_poll_cq()
505 tail++; in rvt_poll_cq()
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/linux/drivers/net/ethernet/intel/fm10k/
A Dfm10k_mbx.c17 fifo->tail = 0; in fm10k_fifo_init()
137 if (len > tail) in fm10k_mbx_index_len()
156 return (tail > mbx->tail) ? --tail : ++tail; in fm10k_mbx_tail_add()
172 return (tail < mbx->tail) ? ++tail : --tail; in fm10k_mbx_tail_sub()
346 tail++; in fm10k_mbx_write_copy()
360 if (!tail) in fm10k_mbx_write_copy()
361 tail++; in fm10k_mbx_write_copy()
439 tail += end; in fm10k_mbx_read_copy()
979 if (!tail || (tail == FM10K_MSG_HDR_MASK(TAIL))) in fm10k_mbx_validate_msg_hdr()
995 if (tail) in fm10k_mbx_validate_msg_hdr()
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/linux/include/linux/
A Dcirc_buf.h12 int tail; member
16 #define CIRC_CNT(head,tail,size) (((head) - (tail)) & ((size)-1)) argument
21 #define CIRC_SPACE(head,tail,size) CIRC_CNT((tail),((head)+1),(size)) argument
26 #define CIRC_CNT_TO_END(head,tail,size) \ argument
27 ({int end = (size) - (tail); \
32 #define CIRC_SPACE_TO_END(head,tail,size) \ argument
34 int n = (end + (tail)) & ((size)-1); \
A Dobjpool.h55 uint32_t tail; member
195 uint32_t head, tail; in __objpool_try_add_slot() local
198 tail = READ_ONCE(slot->tail); in __objpool_try_add_slot()
203 WARN_ON_ONCE(tail - head > pool->nr_objs); in __objpool_try_add_slot()
204 } while (!try_cmpxchg_acquire(&slot->tail, &tail, tail + 1)); in __objpool_try_add_slot()
207 WRITE_ONCE(slot->entries[tail & slot->mask], obj); in __objpool_try_add_slot()
209 smp_store_release(&slot->last, tail + 1); in __objpool_try_add_slot()
/linux/drivers/net/wireguard/
A Dqueueing.c56 queue->head = queue->tail = STUB(queue); in wg_prev_queue_init()
82 struct sk_buff *tail = queue->tail, *next = smp_load_acquire(&NEXT(tail)); in wg_prev_queue_dequeue() local
84 if (tail == STUB(queue)) { in wg_prev_queue_dequeue()
87 queue->tail = next; in wg_prev_queue_dequeue()
88 tail = next; in wg_prev_queue_dequeue()
92 queue->tail = next; in wg_prev_queue_dequeue()
94 return tail; in wg_prev_queue_dequeue()
96 if (tail != READ_ONCE(queue->head)) in wg_prev_queue_dequeue()
99 next = smp_load_acquire(&NEXT(tail)); in wg_prev_queue_dequeue()
101 queue->tail = next; in wg_prev_queue_dequeue()
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/linux/drivers/gpu/drm/i915/gt/
A Dintel_ring.h26 void intel_ring_reset(struct intel_ring *ring, u32 tail);
91 assert_ring_tail_valid(const struct intel_ring *ring, unsigned int tail) in assert_ring_tail_valid() argument
95 GEM_BUG_ON(!intel_ring_offset_valid(ring, tail)); in assert_ring_tail_valid()
112 GEM_BUG_ON(cacheline(tail) == cacheline(head) && tail < head); in assert_ring_tail_valid()
117 intel_ring_set_tail(struct intel_ring *ring, unsigned int tail) in intel_ring_set_tail() argument
125 assert_ring_tail_valid(ring, tail); in intel_ring_set_tail()
126 ring->tail = tail; in intel_ring_set_tail()
127 return tail; in intel_ring_set_tail()
131 __intel_ring_space(unsigned int head, unsigned int tail, unsigned int size) in __intel_ring_space() argument
139 return (head - tail - CACHELINE_BYTES) & (size - 1); in __intel_ring_space()
/linux/arch/arm/kernel/
A Dperf_callchain.c34 user_backtrace(struct frame_tail __user *tail, in user_backtrace() argument
40 if (!access_ok(tail, sizeof(buftail))) in user_backtrace()
44 err = __copy_from_user_inatomic(&buftail, tail, sizeof(buftail)); in user_backtrace()
56 if (tail + 1 >= buftail.fp) in user_backtrace()
65 struct frame_tail __user *tail; in perf_callchain_user() local
72 tail = (struct frame_tail __user *)regs->ARM_fp - 1; in perf_callchain_user()
75 tail && !((unsigned long)tail & 0x3)) in perf_callchain_user()
76 tail = user_backtrace(tail, entry); in perf_callchain_user()
/linux/arch/arm64/kernel/
A Dstacktrace.c351 if (!access_ok(tail, sizeof(buftail))) in unwind_user_frame()
370 if (tail >= buftail.fp) in unwind_user_frame()
399 if (!access_ok(tail, sizeof(buftail))) in unwind_compat_user_frame()
416 if (tail + 1 >= (struct compat_frame_tail __user *) in unwind_compat_user_frame()
433 struct frame_tail __user *tail; in arch_stack_walk_user() local
435 tail = (struct frame_tail __user *)regs->regs[29]; in arch_stack_walk_user()
436 while (tail && !((unsigned long)tail & 0x7)) in arch_stack_walk_user()
437 tail = unwind_user_frame(tail, cookie, consume_entry); in arch_stack_walk_user()
441 struct compat_frame_tail __user *tail; in arch_stack_walk_user() local
444 while (tail && !((unsigned long)tail & 0x3)) in arch_stack_walk_user()
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/linux/kernel/locking/
A Dqspinlock.c118 u32 tail; in encode_tail() local
120 tail = (cpu + 1) << _Q_TAIL_CPU_OFFSET; in encode_tail()
123 return tail; in encode_tail()
128 int cpu = (tail >> _Q_TAIL_CPU_OFFSET) - 1; in decode_tail()
183 return (u32)xchg_relaxed(&lock->tail, in xchg_tail()
184 tail >> _Q_TAIL_OFFSET) << _Q_TAIL_OFFSET; in xchg_tail()
227 new = (old & _Q_LOCKED_PENDING_MASK) | tail; in xchg_tail()
316 u32 old, tail; in queued_spin_lock_slowpath() local
400 tail = encode_tail(smp_processor_id(), idx); in queued_spin_lock_slowpath()
460 old = xchg_tail(lock, tail); in queued_spin_lock_slowpath()
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/linux/include/drm/
A Dspsc_queue.h43 atomic_long_t tail; member
51 atomic_long_set(&queue->tail, (long)&queue->head); in spsc_queue_init()
67 struct spsc_node **tail; in spsc_queue_push() local
73 tail = (struct spsc_node **)atomic_long_xchg(&queue->tail, (long)&node->next); in spsc_queue_push()
74 WRITE_ONCE(*tail, node); in spsc_queue_push()
85 return tail == &queue->head; in spsc_queue_push()
107 if (atomic_long_cmpxchg(&queue->tail, in spsc_queue_pop()
/linux/drivers/media/test-drivers/vidtv/
A Dvidtv_channel.c182 tail = vidtv_psi_eit_event_init(tail, event_id); in vidtv_channel_eit_event_cat_into_new()
183 if (!tail) { in vidtv_channel_eit_event_cat_into_new()
192 head = tail; in vidtv_channel_eit_event_cat_into_new()
229 tail = vidtv_psi_sdt_service_init(tail, in vidtv_channel_sdt_serv_cat_into_new()
233 if (!tail) in vidtv_channel_sdt_serv_cat_into_new()
242 head = tail; in vidtv_channel_sdt_serv_cat_into_new()
284 tail = vidtv_psi_pat_program_init(tail, in vidtv_channel_pat_prog_cat_into_new()
287 if (!tail) { in vidtv_channel_pat_prog_cat_into_new()
293 head = tail; in vidtv_channel_pat_prog_cat_into_new()
341 tail = vidtv_psi_pmt_stream_init(tail, in vidtv_channel_pmt_match_sections()
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/linux/Documentation/trace/
A Dring-buffer-design.rst21 tail
227 tail page
323 tail page
337 and possibly the tail page. That is when the commit (and tail) page has been
378 tail page
390 tail page
624 tail page
635 tail page
681 tail page
743 on the new tail page.
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/linux/net/sunrpc/
A Dxdr.c179 const struct kvec *tail = xdr->tail; in xdr_buf_to_bvec() local
231 struct kvec *tail = xdr->tail; in xdr_inline_pages() local
561 struct kvec *tail = buf->tail; in xdr_buf_try_expand() local
588 const struct kvec *tail = buf->tail; in xdr_buf_tail_copy_right() local
602 const struct kvec *tail = buf->tail; in xdr_buf_pages_copy_right() local
636 const struct kvec *tail = buf->tail; in xdr_buf_head_copy_right() local
682 const struct kvec *tail = buf->tail; in xdr_buf_tail_shift_right() local
727 const struct kvec *tail = buf->tail; in xdr_buf_tail_copy_left() local
1189 struct kvec *tail = buf->tail; in xdr_truncate_encode() local
1203 xdr->p = tail->iov_base + tail->iov_len; in xdr_truncate_encode()
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/linux/fs/
A Dsplice.c201 unsigned int tail = pipe->tail; in splice_to_pipe() local
249 unsigned int tail = pipe->tail; in add_to_pipe() local
482 pipe->tail = tail; in splice_from_pipe_feed()
503 pipe->tail = tail+1; in eat_empty_buffer()
713 tail = pipe->tail; in iter_file_splice_write()
753 tail = pipe->tail; in iter_file_splice_write()
761 pipe->tail = tail; in iter_file_splice_write()
848 tail = pipe->tail; in splice_to_socket()
895 tail = pipe->tail; in splice_to_socket()
910 if (tail != pipe->tail) { in splice_to_socket()
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A Dpipe.c214 unsigned int tail = READ_ONCE(pipe->tail); in pipe_readable() local
237 pipe->tail = ++tail; in pipe_update_tail()
246 pipe->tail = ++tail; in pipe_update_tail()
278 unsigned int tail = pipe->tail; in pipe_read() local
344 tail = pipe_update_tail(pipe, buf, tail); in pipe_read()
420 unsigned int tail = READ_ONCE(pipe->tail); in pipe_writable() local
625 tail = pipe->tail; in pipe_ioctl()
630 tail++; in pipe_ioctl()
683 tail = READ_ONCE(pipe->tail); in pipe_poll()
1279 tail = pipe->tail; in pipe_resize_ring()
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/linux/drivers/gpu/drm/xe/
A Dxe_trace_guc.h62 TP_PROTO(struct xe_device *xe, u8 gt_id, u32 action, u32 len, u32 _head, u32 tail),
63 TP_ARGS(xe, gt_id, action, len, _head, tail),
70 __field(u32, tail)
79 __entry->tail = tail;
85 __entry->tail, __entry->_head)
89 TP_PROTO(struct xe_device *xe, u8 gt_id, u32 action, u32 len, u32 _head, u32 tail),
90 TP_ARGS(xe, gt_id, action, len, _head, tail)
94 TP_PROTO(struct xe_device *xe, u8 gt_id, u32 action, u32 len, u32 _head, u32 tail),
95 TP_ARGS(xe, gt_id, action, len, _head, tail),
99 __entry->tail, __entry->_head)
/linux/net/sched/
A Dsch_choke.c67 unsigned int tail; member
97 if (q->head == q->tail) in choke_zap_head_holes()
106 q->tail = (q->tail - 1) & q->tab_mask; in choke_zap_tail_holes()
107 if (q->head == q->tail) in choke_zap_tail_holes()
123 if (idx == q->tail) in choke_drop_by_idx()
205 if (q->head == q->tail) in choke_match_random()
268 q->tab[q->tail] = skb; in choke_enqueue()
269 q->tail = (q->tail + 1) & q->tab_mask; in choke_enqueue()
319 q->head = q->tail = 0; in choke_reset()
389 if (tail < mask) { in choke_change()
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