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/linux/tools/lib/
H A Dlist_sort.c16 struct list_head *head, **tail = &head; in merge() local
21 *tail = a; in merge()
22 tail = &a->next; in merge()
25 *tail = b; in merge()
29 *tail = b; in merge()
30 tail = &b->next; in merge()
33 *tail = a; in merge()
52 struct list_head *tail = head; in merge_final() local
57 tail->next = a; in merge_final()
58 a->prev = tail; in merge_final()
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/linux/Documentation/translations/zh_CN/core-api/
H 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);
148 if (CIRC_SPACE(head, tail, buffer->size) >= 1) {
181 unsigned long tail = buffer->tail;
183 if (CIRC_CNT(head, tail, buffer->size) >= 1) {
186 struct item *item = buffer[tail];
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/linux/drivers/rpmsg/
H 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()
88 if (head < tail) in glink_smem_rx_avail()
89 return pipe->native.length - tail + head; in glink_smem_rx_avail()
91 return head - 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()
102 tail += offset; in glink_smem_rx_peek()
103 if (tail >= pipe->native.length) in glink_smem_rx_peek()
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H 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()
79 return pipe->native.length - tail + head; in glink_rpm_rx_avail()
81 return head - tail; in glink_rpm_rx_avail()
88 unsigned int tail; in glink_rpm_rx_peek() local
91 tail = readl(pipe->tail); in glink_rpm_rx_peek()
92 tail += offset; in glink_rpm_rx_peek()
93 if (tail >= pipe->native.length) in glink_rpm_rx_peek()
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/linux/drivers/net/ethernet/intel/fm10k/
H A Dfm10k_mbx.c17 fifo->tail = 0; in fm10k_fifo_init()
28 return fifo->tail - fifo->head; in fm10k_fifo_used()
39 return fifo->size + fifo->head - fifo->tail; in fm10k_fifo_unused()
50 return fifo->head == fifo->tail; in fm10k_fifo_empty()
74 return (fifo->tail + offset) & (fifo->size - 1); in fm10k_fifo_tail_offset()
120 fifo->head = fifo->tail; in fm10k_fifo_drop_all()
132 static u16 fm10k_mbx_index_len(struct fm10k_mbx_info *mbx, u16 head, u16 tail) in fm10k_mbx_index_len() argument
134 u16 len = tail - head; in fm10k_mbx_index_len()
137 if (len > tail) in fm10k_mbx_index_len()
153 u16 tail = (mbx->tail + offset + 1) & ((mbx->mbmem_len << 1) - 1); in fm10k_mbx_tail_add() local
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/linux/drivers/infiniband/sw/rdmavt/
H 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()
62 if (unlikely(next == tail || cq->cq_full)) { in rvt_cq_enter()
321 RDMA_READ_UAPI_ATOMIC(cq->queue->tail)) in rvt_req_notify_cq()
324 if (cq->kqueue->head != cq->kqueue->tail) in rvt_req_notify_cq()
343 u32 head, tail, n; in rvt_resize_cq() local
388 tail = RDMA_READ_UAPI_ATOMIC(old_u_wc->tail); in rvt_resize_cq()
392 tail = old_k_wc->tail; in rvt_resize_cq()
397 if (tail > (u32)cq->ibcq.cqe) in rvt_resize_cq()
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H A Dsrq.c137 u32 sz, size, n, head, tail; in rvt_modify_srq() local
175 tail = RDMA_READ_UAPI_ATOMIC(owq->tail); in rvt_modify_srq()
179 tail = okwq->tail; in rvt_modify_srq()
181 if (head >= srq->rq.size || tail >= srq->rq.size) { in rvt_modify_srq()
186 if (n < tail) in rvt_modify_srq()
187 n += srq->rq.size - tail; in rvt_modify_srq()
189 n -= tail; in rvt_modify_srq()
196 while (tail != head) { in rvt_modify_srq()
200 wqe = rvt_get_rwqe_ptr(&srq->rq, tail); in rvt_modify_srq()
207 if (++tail >= srq->rq.size) in rvt_modify_srq()
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H A Drc.c66 u32 tail; in rvt_compute_aeth() local
73 tail = RDMA_READ_UAPI_ATOMIC(qp->r_rq.wq->tail); in rvt_compute_aeth()
76 tail = READ_ONCE(qp->r_rq.kwq->tail); in rvt_compute_aeth()
80 if (tail >= qp->r_rq.size) in rvt_compute_aeth()
81 tail = 0; in rvt_compute_aeth()
88 credits = rvt_get_rq_count(&qp->r_rq, head, tail); in rvt_compute_aeth()
/linux/include/linux/
H 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); \
H A Dpipe_fs_i.h57 pipe_index_t tail; member
175 static inline unsigned int pipe_occupancy(unsigned int head, unsigned int tail) in pipe_occupancy() argument
177 return (pipe_index_t)(head - tail); in pipe_occupancy()
185 static inline bool pipe_empty(unsigned int head, unsigned int tail) in pipe_empty() argument
187 return !pipe_occupancy(head, tail); in pipe_empty()
196 static inline bool pipe_full(unsigned int head, unsigned int tail, in pipe_full() argument
199 return pipe_occupancy(head, tail) >= limit; in pipe_full()
208 return pipe_full(pipe->head, pipe->tail, pipe->max_usage); in pipe_is_full()
217 return pipe_empty(pipe->head, pipe->tail); in pipe_is_empty()
226 return pipe_occupancy(pipe->head, pipe->tail); in pipe_buf_usage()
/linux/arch/arm/kernel/
H 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/drivers/net/wireguard/
H 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/
H A Dintel_ring.h25 void intel_ring_reset(struct intel_ring *ring, u32 tail);
90 assert_ring_tail_valid(const struct intel_ring *ring, unsigned int tail) in assert_ring_tail_valid() argument
94 GEM_BUG_ON(!intel_ring_offset_valid(ring, tail)); in assert_ring_tail_valid()
111 GEM_BUG_ON(cacheline(tail) == cacheline(head) && tail < head); in assert_ring_tail_valid()
116 intel_ring_set_tail(struct intel_ring *ring, unsigned int tail) in intel_ring_set_tail() argument
124 assert_ring_tail_valid(ring, tail); in intel_ring_set_tail()
125 ring->tail = tail; in intel_ring_set_tail()
126 return tail; in intel_ring_set_tail()
130 __intel_ring_space(unsigned int head, unsigned int tail, unsigned int size) in __intel_ring_space() argument
138 return (head - tail - CACHELINE_BYTES) & (size - 1); in __intel_ring_space()
/linux/kernel/locking/
H A Dqspinlock.c46 * In particular; where the traditional MCS lock consists of a tail pointer
48 * unlock the next pending (next->locked), we compress both these: {tail,
54 * we can encode the tail by combining the 2-bit nesting level with the cpu
55 * number. With one byte for the lock value and 3 bytes for the tail, only a
114 * (queue tail, pending bit, lock value)
133 u32 old, tail;
217 tail = encode_tail(smp_processor_id(), idx);
265 * publish the updated tail via xchg_tail() and potentially link
271 * Publish the updated tail. in __pv_wait_node()
277 old = xchg_tail(lock, tail); in __pv_wait_head_or_lock()
118 u32 tail; encode_tail() local
126 decode_tail(u32 tail) decode_tail() argument
177 xchg_tail(struct qspinlock * lock,u32 tail) xchg_tail() argument
221 xchg_tail(struct qspinlock * lock,u32 tail) xchg_tail() argument
316 u32 old, tail; queued_spin_lock_slowpath() local
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/linux/Documentation/trace/
H A Dring-buffer-design.rst21 tail
191 It is possible that the page swapped is the commit page and the tail page,
196 reader page commit page tail page
227 tail page
253 +---------+ <--- tail pointer
278 +---------+ <--- tail pointer
291 +---------+ <--- tail pointer
302 +---------+ <--(last full commit and tail pointer)
311 The tail page points to the page with the last write (before
314 The tail page is always equal to or after the commit page. It may
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/linux/net/sunrpc/
H A Dxdr.c151 const struct kvec *tail = xdr->tail; in xdr_buf_to_bvec() local
176 if (tail->iov_len) { in xdr_buf_to_bvec()
177 bvec_set_virt(bvec, tail->iov_base, tail->iov_len); in xdr_buf_to_bvec()
204 struct kvec *tail = xdr->tail; in xdr_inline_pages() local
214 tail->iov_base = buf + offset; in xdr_inline_pages()
215 tail->iov_len = buflen - offset; in xdr_inline_pages()
474 xdr_buf_iov_zero(buf->tail, pgbase - buf->page_len, len); in xdr_buf_pages_zero()
478 xdr_buf_iov_zero(buf->tail, 0, pgbase + len - buf->page_len); in xdr_buf_pages_zero()
534 struct kvec *tail = buf->tail; in xdr_buf_try_expand() local
535 unsigned int sum = head->iov_len + buf->page_len + tail->iov_len; in xdr_buf_try_expand()
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/linux/include/drm/
H 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
76 tail = (struct spsc_node **)atomic_long_xchg(&queue->tail, (long)&node->next); in spsc_queue_push()
77 WRITE_ONCE(*tail, node); in spsc_queue_push()
87 return tail == &queue->head; in spsc_queue_push()
109 if (atomic_long_cmpxchg(&queue->tail, in spsc_queue_pop()
/linux/tools/testing/selftests/bpf/progs/
H A Dbpf_arena_spin_lock.h42 u16 tail; member
46 u16 tail; member
114 u32 tail; in encode_tail() local
116 tail = (cpu + 1) << _Q_TAIL_CPU_OFFSET; in encode_tail()
117 tail |= idx << _Q_TAIL_IDX_OFFSET; /* assume < 4 */ in encode_tail()
119 return tail; in encode_tail()
122 static inline struct arena_mcs_spinlock __arena *decode_tail(u32 tail) in decode_tail() argument
124 u32 cpu = (tail >> _Q_TAIL_CPU_OFFSET) - 1; in decode_tail()
125 u32 idx = (tail & _Q_TAIL_IDX_MASK) >> _Q_TAIL_IDX_OFFSET; in decode_tail()
148 static __always_inline u32 xchg_tail(arena_spinlock_t __arena *lock, u32 tail) in xchg_tail() argument
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/linux/net/sched/
H A Dsch_choke.c67 unsigned int tail; member
77 return (q->tail - q->head) & q->tab_mask; in choke_len()
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()
109 } while (q->tab[q->tail] == NULL); 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()
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/linux/drivers/infiniband/hw/vmw_pvrdma/
H A Dpvrdma_ring.h89 const __u32 tail = atomic_read(&r->prod_tail); in pvrdma_idx_ring_has_space() local
92 if (pvrdma_idx_valid(tail, max_elems) && in pvrdma_idx_ring_has_space()
94 *out_tail = tail & (max_elems - 1); in pvrdma_idx_ring_has_space()
95 return tail != (head ^ max_elems); in pvrdma_idx_ring_has_space()
103 const __u32 tail = atomic_read(&r->prod_tail); in pvrdma_idx_ring_has_data() local
106 if (pvrdma_idx_valid(tail, max_elems) && in pvrdma_idx_ring_has_data()
109 return tail != head; in pvrdma_idx_ring_has_data()
/linux/arch/arm64/kernel/
H A Dstacktrace.c516 unwind_user_frame(struct frame_tail __user *tail, void *cookie, in unwind_user_frame() argument
524 if (!access_ok(tail, sizeof(buftail))) in unwind_user_frame()
528 err = __copy_from_user_inatomic(&buftail, tail, sizeof(buftail)); in unwind_user_frame()
543 if (tail >= buftail.fp) in unwind_user_frame()
565 unwind_compat_user_frame(struct compat_frame_tail __user *tail, void *cookie, in unwind_compat_user_frame() argument
572 if (!access_ok(tail, sizeof(buftail))) in unwind_compat_user_frame()
576 err = __copy_from_user_inatomic(&buftail, tail, sizeof(buftail)); in unwind_compat_user_frame()
589 if (tail + 1 >= (struct compat_frame_tail __user *) in unwind_compat_user_frame()
606 struct frame_tail __user *tail; in arch_stack_walk_user() local
608 tail = (struct frame_tail __user *)regs->regs[29]; in arch_stack_walk_user()
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/linux/net/rxrpc/
H A Dcall_accept.c45 unsigned int head, tail, call_head, call_tail; in rxrpc_service_prealloc_one() local
69 tail = READ_ONCE(b->peer_backlog_tail); in rxrpc_service_prealloc_one()
70 if (CIRC_CNT(head, tail, size) < max) { in rxrpc_service_prealloc_one()
82 tail = READ_ONCE(b->conn_backlog_tail); in rxrpc_service_prealloc_one()
83 if (CIRC_CNT(head, tail, size) < max) { in rxrpc_service_prealloc_one()
183 unsigned int size = RXRPC_BACKLOG_MAX, head, tail; in rxrpc_discard_prealloc() local
196 tail = b->peer_backlog_tail; in rxrpc_discard_prealloc()
197 while (CIRC_CNT(head, tail, size) > 0) { in rxrpc_discard_prealloc()
198 struct rxrpc_peer *peer = b->peer_backlog[tail]; in rxrpc_discard_prealloc()
201 tail = (tail + 1) & (size - 1); in rxrpc_discard_prealloc()
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/linux/drivers/tty/
H A Dn_tty.c161 static void tty_copy(const struct tty_struct *tty, void *to, size_t tail, in tty_copy() argument
165 size_t size = N_TTY_BUF_SIZE - tail; in tty_copy()
166 void *from = read_buf_addr(ldata, tail); in tty_copy()
560 static int n_tty_process_echo_ops(struct tty_struct *tty, size_t *tail, in n_tty_process_echo_ops() argument
570 if (MASK(ldata->echo_commit) == MASK(*tail + 1)) in n_tty_process_echo_ops()
577 op = echo_buf(ldata, *tail + 1); in n_tty_process_echo_ops()
583 if (MASK(ldata->echo_commit) == MASK(*tail + 2)) in n_tty_process_echo_ops()
586 num_chars = echo_buf(ldata, *tail + 2); in n_tty_process_echo_ops()
608 *tail += 3; in n_tty_process_echo_ops()
613 *tail += 2; in n_tty_process_echo_ops()
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/linux/fs/
H A Dsplice.c201 unsigned int tail = pipe->tail; in splice_to_pipe() local
215 while (!pipe_full(head, tail, pipe->max_usage)) { in splice_to_pipe()
248 unsigned int tail = pipe->tail; in add_to_pipe() local
254 } else if (pipe_full(head, tail, pipe->max_usage)) { in add_to_pipe()
447 unsigned int tail = pipe->tail; in splice_from_pipe_feed() local
450 while (!pipe_empty(head, tail)) { in splice_from_pipe_feed()
451 struct pipe_buffer *buf = pipe_buf(pipe, tail); in splice_from_pipe_feed()
478 tail++; in splice_from_pipe_feed()
479 pipe->tail = tail; in splice_from_pipe_feed()
494 unsigned int tail = pipe->tail; in eat_empty_buffer() local
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/linux/fs/affs/
H A Dinode.c22 struct affs_tail *tail; in affs_iget() local
50 tail = AFFS_TAIL(sb, bh); in affs_iget()
51 prot = be32_to_cpu(tail->protect); in affs_iget()
76 id = be16_to_cpu(tail->uid); in affs_iget()
84 id = be16_to_cpu(tail->gid); in affs_iget()
92 switch (be32_to_cpu(tail->stype)) { in affs_iget()
98 if (be32_to_cpu(tail->stype) == ST_USERDIR || in affs_iget()
127 size = be32_to_cpu(tail->size); in affs_iget()
136 if (tail->link_chain) in affs_iget()
153 …ode_set_ctime(inode, (be32_to_cpu(tail->change.days) * 86400LL + be32_to_cpu(tail->change.mins) * … in affs_iget()
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