Hi Xin, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on net-next/master] url: https://github.com/0day-ci/linux/commits/Xin-Long/sctp-Implement-Stream-Interleave-The-I-DATA-Chunk-Supporting-User-Message-Interleaving/20171208-031625 config: x86_64-randconfig-g0-12080821 (attached as .config) compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4 reproduce: # save the attached .config to linux build tree make ARCH=x86_64 Note: it may well be a FALSE warning. FWIW you are at least aware of it now. http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings All warnings (new ones prefixed by >>): Cyclomatic Complexity 1 include/linux/spinlock.h:spinlock_check Cyclomatic Complexity 1 include/linux/skbuff.h:skb_queue_empty Cyclomatic Complexity 2 include/linux/skbuff.h:skb_peek_tail Cyclomatic Complexity 1 include/linux/skbuff.h:__skb_queue_head_init Cyclomatic Complexity 1 include/linux/skbuff.h:__skb_insert Cyclomatic Complexity 1 include/linux/skbuff.h:__skb_queue_splice Cyclomatic Complexity 2 include/linux/skbuff.h:skb_queue_splice_tail_init Cyclomatic Complexity 1 include/linux/skbuff.h:__skb_queue_before Cyclomatic Complexity 1 include/linux/skbuff.h:__skb_queue_tail Cyclomatic Complexity 1 include/linux/skbuff.h:__skb_unlink Cyclomatic Complexity 1 include/net/net_namespace.h:read_pnet Cyclomatic Complexity 1 include/net/sock.h:sk_has_account Cyclomatic Complexity 1 include/net/sock.h:sock_net Cyclomatic Complexity 1 include/net/busy_poll.h:sk_mark_napi_id Cyclomatic Complexity 1 include/net/sctp/ulpevent.h:sctp_skb2event Cyclomatic Complexity 2 include/net/sctp/ulpevent.h:sctp_ulpevent_type_enabled Cyclomatic Complexity 1 include/net/sctp/structs.h:sctp_sk Cyclomatic Complexity 1 include/net/sctp/structs.h:sctp_chunk_stream_no Cyclomatic Complexity 6 net//sctp/stream_interleave.c:sctp_validate_data Cyclomatic Complexity 15 net//sctp/stream_interleave.c:sctp_intl_retrieve_first Cyclomatic Complexity 16 net//sctp/stream_interleave.c:sctp_intl_retrieve_partial Cyclomatic Complexity 25 net//sctp/stream_interleave.c:sctp_intl_retrieve_reassembled Cyclomatic Complexity 3 include/net/sock.h:sk_mem_reclaim Cyclomatic Complexity 2 include/net/sctp/ulpevent.h:sctp_event2skb Cyclomatic Complexity 23 net//sctp/stream_interleave.c:sctp_intl_store_reasm Cyclomatic Complexity 6 net//sctp/stream_interleave.c:sctp_intl_reasm Cyclomatic Complexity 13 net//sctp/stream_interleave.c:sctp_intl_store_ordered Cyclomatic Complexity 5 net//sctp/stream_interleave.c:sctp_intl_retrieve_ordered Cyclomatic Complexity 3 net//sctp/stream_interleave.c:sctp_intl_order Cyclomatic Complexity 2 include/net/sock.h:sk_incoming_cpu_update Cyclomatic Complexity 2 include/net/sctp/ulpevent.h:sctp_ulpevent_is_enabled Cyclomatic Complexity 9 net//sctp/stream_interleave.c:sctp_enqueue_event Cyclomatic Complexity 4 net//sctp/stream_interleave.c:sctp_intl_start_pd Cyclomatic Complexity 6 net//sctp/stream_interleave.c:sctp_validate_idata Cyclomatic Complexity 8 net//sctp/stream_interleave.c:sctp_chunk_assign_mid Cyclomatic Complexity 1 include/linux/skbuff.h:skb_queue_head_init Cyclomatic Complexity 6 net//sctp/stream_interleave.c:sctp_ulpevent_idata Cyclomatic Complexity 7 net//sctp/stream_interleave.c:sctp_renege_events Cyclomatic Complexity 3 net//sctp/stream_interleave.c:sctp_make_idatafrag_empty Cyclomatic Complexity 3 net//sctp/stream_interleave.c:sctp_stream_interleave_init net//sctp/stream_interleave.c: In function 'sctp_renege_events': >> net//sctp/stream_interleave.c:581:26: warning: 'sin' may be used uninitialized in this function [-Wmaybe-uninitialized] cevent->mid == sin->mid && ^ net//sctp/stream_interleave.c:550:32: note: 'sin' was declared here struct sctp_stream_in *csin, *sin; ^ vim +/sin +581 net//sctp/stream_interleave.c 547 548 static struct sctp_ulpevent *sctp_intl_retrieve_first(struct sctp_ulpq *ulpq) 549 { 550 struct sctp_stream_in *csin, *sin; 551 struct sk_buff *first_frag = NULL; 552 struct sk_buff *last_frag = NULL; 553 struct sctp_ulpevent *retval; 554 struct sk_buff *pos; 555 __u32 next_fsn = 0; 556 __u16 sid = 0; 557 558 skb_queue_walk(&ulpq->reasm, pos) { 559 struct sctp_ulpevent *cevent = sctp_skb2event(pos); 560 561 csin = sctp_stream_in(ulpq->asoc, cevent->stream); 562 if (csin->pd_mode) 563 continue; 564 565 switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) { 566 case SCTP_DATA_FIRST_FRAG: 567 if (first_frag) 568 goto out; 569 if (cevent->mid == csin->mid) { 570 first_frag = pos; 571 last_frag = pos; 572 next_fsn = 0; 573 sin = csin; 574 sid = cevent->stream; 575 } 576 break; 577 case SCTP_DATA_MIDDLE_FRAG: 578 if (!first_frag) 579 break; 580 if (cevent->stream == sid && > 581 cevent->mid == sin->mid && 582 cevent->fsn == next_fsn) { 583 next_fsn++; 584 last_frag = pos; 585 } else { 586 goto out; 587 } 588 break; 589 case SCTP_DATA_LAST_FRAG: 590 if (first_frag) 591 goto out; 592 break; 593 default: 594 break; 595 } 596 } 597 598 if (!first_frag) 599 return NULL; 600 601 out: 602 retval = sctp_make_reassembled_event(sock_net(ulpq->asoc->base.sk), 603 &ulpq->reasm, first_frag, 604 last_frag); 605 if (retval) { 606 sin->fsn = next_fsn; 607 sin->pd_mode = 1; 608 } 609 610 return retval; 611 } 612 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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