net/mptcp/protocol.c:1568:12: warning: stack frame size of 1032 bytes in function 'mptcp_sendmsg'

From: kernel test robot
Date: Sat Mar 13 2021 - 14:37:19 EST

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: f296bfd5cd04cbb49b8fc9585adc280ab2b58624
commit: 6e628cd3a8f78cb0dfe85353e5e488bda296bedf mptcp: use mptcp release_cb for delayed tasks
date: 3 months ago
config: mips-randconfig-r034-20210313 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project dfd27ebbd0eb137c9a439b7c537bb87ba903efd3)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install mips cross compiling tool for clang build
# apt-get install binutils-mips-linux-gnu
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6e628cd3a8f78cb0dfe85353e5e488bda296bedf
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 6e628cd3a8f78cb0dfe85353e5e488bda296bedf
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

>> net/mptcp/protocol.c:1568:12: warning: stack frame size of 1032 bytes in function 'mptcp_sendmsg' [-Wframe-larger-than=]
static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
^
1 warning generated.


vim +/mptcp_sendmsg +1568 net/mptcp/protocol.c

6e628cd3a8f78c Paolo Abeni 2020-11-27 1567
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 @1568 static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1569 {
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1570 struct mptcp_sock *msk = mptcp_sk(sk);
17091708d1e503 Florian Westphal 2020-05-16 1571 struct page_frag *pfrag;
6d0060f600adfd Mat Martineau 2020-01-21 1572 size_t copied = 0;
caf971df01b86f Paolo Abeni 2020-11-16 1573 int ret = 0;
6d0060f600adfd Mat Martineau 2020-01-21 1574 long timeo;
f870fa0b576884 Mat Martineau 2020-01-21 1575
f870fa0b576884 Mat Martineau 2020-01-21 1576 if (msg->msg_flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL))
f870fa0b576884 Mat Martineau 2020-01-21 1577 return -EOPNOTSUPP;
f870fa0b576884 Mat Martineau 2020-01-21 1578
e93da92896bc0d Paolo Abeni 2020-11-27 1579 mptcp_lock_sock(sk, __mptcp_wmem_reserve(sk, len));
1954b86016cf85 Mat Martineau 2020-02-28 1580
1954b86016cf85 Mat Martineau 2020-02-28 1581 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1954b86016cf85 Mat Martineau 2020-02-28 1582
1954b86016cf85 Mat Martineau 2020-02-28 1583 if ((1 << sk->sk_state) & ~(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)) {
1954b86016cf85 Mat Martineau 2020-02-28 1584 ret = sk_stream_wait_connect(sk, &timeo);
1954b86016cf85 Mat Martineau 2020-02-28 1585 if (ret)
1954b86016cf85 Mat Martineau 2020-02-28 1586 goto out;
1954b86016cf85 Mat Martineau 2020-02-28 1587 }
1954b86016cf85 Mat Martineau 2020-02-28 1588
17091708d1e503 Florian Westphal 2020-05-16 1589 pfrag = sk_page_frag(sk);
18b683bff89d46 Paolo Abeni 2020-03-27 1590
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1591 while (msg_data_left(msg)) {
724cfd2ee8aa12 Paolo Abeni 2020-11-27 1592 int total_ts, frag_truesize = 0;
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1593 struct mptcp_data_frag *dfrag;
724cfd2ee8aa12 Paolo Abeni 2020-11-27 1594 struct sk_buff_head skbs;
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1595 bool dfrag_collapsed;
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1596 size_t psize, offset;
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1597
57baaf2875404b Mat Martineau 2020-07-28 1598 if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)) {
57baaf2875404b Mat Martineau 2020-07-28 1599 ret = -EPIPE;
57baaf2875404b Mat Martineau 2020-07-28 1600 goto out;
57baaf2875404b Mat Martineau 2020-07-28 1601 }
57baaf2875404b Mat Martineau 2020-07-28 1602
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1603 /* reuse tail pfrag, if possible, or carve a new one from the
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1604 * page allocator
fb529e62d3f3e8 Florian Westphal 2020-05-16 1605 */
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1606 dfrag = mptcp_pending_tail(sk);
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1607 dfrag_collapsed = mptcp_frag_can_collapse_to(msk, pfrag, dfrag);
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1608 if (!dfrag_collapsed) {
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1609 if (!sk_stream_memory_free(sk))
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1610 goto wait_for_memory;
6e628cd3a8f78c Paolo Abeni 2020-11-27 1611
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1612 if (!mptcp_page_frag_refill(sk, pfrag))
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1613 goto wait_for_memory;
cec37a6e41aae7 Peter Krystad 2020-01-21 1614
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1615 dfrag = mptcp_carve_data_frag(msk, pfrag, pfrag->offset);
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1616 frag_truesize = dfrag->overhead;
72511aab95c94d Florian Westphal 2020-05-16 1617 }
6d0060f600adfd Mat Martineau 2020-01-21 1618
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1619 /* we do not bound vs wspace, to allow a single packet.
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1620 * memory accounting will prevent execessive memory usage
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1621 * anyway
d5f49190def61c Paolo Abeni 2020-09-14 1622 */
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1623 offset = dfrag->offset + dfrag->data_len;
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1624 psize = pfrag->size - offset;
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1625 psize = min_t(size_t, psize, msg_data_left(msg));
724cfd2ee8aa12 Paolo Abeni 2020-11-27 1626 total_ts = psize + frag_truesize;
724cfd2ee8aa12 Paolo Abeni 2020-11-27 1627 __skb_queue_head_init(&skbs);
724cfd2ee8aa12 Paolo Abeni 2020-11-27 1628 if (!mptcp_tx_cache_refill(sk, psize, &skbs, &total_ts))
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1629 goto wait_for_memory;
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1630
724cfd2ee8aa12 Paolo Abeni 2020-11-27 1631 if (!mptcp_wmem_alloc(sk, total_ts)) {
724cfd2ee8aa12 Paolo Abeni 2020-11-27 1632 __skb_queue_purge(&skbs);
724cfd2ee8aa12 Paolo Abeni 2020-11-27 1633 goto wait_for_memory;
724cfd2ee8aa12 Paolo Abeni 2020-11-27 1634 }
724cfd2ee8aa12 Paolo Abeni 2020-11-27 1635
724cfd2ee8aa12 Paolo Abeni 2020-11-27 1636 skb_queue_splice_tail(&skbs, &msk->skb_tx_cache);
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1637 if (copy_page_from_iter(dfrag->page, offset, psize,
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1638 &msg->msg_iter) != psize) {
879526030c8b5e Paolo Abeni 2020-11-27 1639 mptcp_wmem_uncharge(sk, psize + frag_truesize);
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1640 ret = -EFAULT;
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1641 goto out;
72511aab95c94d Florian Westphal 2020-05-16 1642 }
72511aab95c94d Florian Westphal 2020-05-16 1643
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1644 /* data successfully copied into the write queue */
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1645 copied += psize;
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1646 dfrag->data_len += psize;
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1647 frag_truesize += psize;
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1648 pfrag->offset += frag_truesize;
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1649 WRITE_ONCE(msk->write_seq, msk->write_seq + psize);
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1650
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1651 /* charge data on mptcp pending queue to the msk socket
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1652 * Note: we charge such data both to sk and ssk
fb529e62d3f3e8 Florian Westphal 2020-05-16 1653 */
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1654 sk_wmem_queued_add(sk, frag_truesize);
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1655 if (!dfrag_collapsed) {
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1656 get_page(dfrag->page);
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1657 list_add_tail(&dfrag->list, &msk->rtx_queue);
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1658 if (!msk->first_pending)
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1659 WRITE_ONCE(msk->first_pending, dfrag);
6d0060f600adfd Mat Martineau 2020-01-21 1660 }
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1661 pr_debug("msk=%p dfrag at seq=%lld len=%d sent=%d new=%d", msk,
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1662 dfrag->data_seq, dfrag->data_len, dfrag->already_sent,
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1663 !dfrag_collapsed);
6d0060f600adfd Mat Martineau 2020-01-21 1664
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1665 continue;
b51f9b80c032e1 Paolo Abeni 2020-03-27 1666
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1667 wait_for_memory:
6e628cd3a8f78c Paolo Abeni 2020-11-27 1668 set_bit(MPTCP_NOSPACE, &msk->flags);
6e628cd3a8f78c Paolo Abeni 2020-11-27 1669 mptcp_push_pending(sk, msg->msg_flags);
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1670 ret = sk_stream_wait_memory(sk, &timeo);
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1671 if (ret)
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1672 goto out;
57040755a3e43a Paolo Abeni 2020-01-21 1673 }
6d0060f600adfd Mat Martineau 2020-01-21 1674
724cfd2ee8aa12 Paolo Abeni 2020-11-27 1675 if (copied) {
724cfd2ee8aa12 Paolo Abeni 2020-11-27 1676 msk->tx_pending_data += copied;
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1677 mptcp_push_pending(sk, msg->msg_flags);
724cfd2ee8aa12 Paolo Abeni 2020-11-27 1678 }
d9ca1de8c0cd7a Paolo Abeni 2020-11-16 1679
1954b86016cf85 Mat Martineau 2020-02-28 1680 out:
cec37a6e41aae7 Peter Krystad 2020-01-21 1681 release_sock(sk);
8555c6bfd5fddb Paolo Abeni 2020-08-03 1682 return copied ? : ret;
f870fa0b576884 Mat Martineau 2020-01-21 1683 }
f870fa0b576884 Mat Martineau 2020-01-21 1684

:::::: The code at line 1568 was first introduced by commit
:::::: d9ca1de8c0cd7a8ca2a0506e1741418741848e53 mptcp: move page frag allocation in mptcp_sendmsg()

:::::: TO: Paolo Abeni <pabeni@xxxxxxxxxx>
:::::: CC: Jakub Kicinski <kuba@xxxxxxxxxx>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

Attachment: .config.gz
Description: application/gzip