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charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit tree: https://github.com/intel/linux-intel-lts.git pr/60 head: 9e3b33a0fe250f006a2d39da8cc8f99a0101e89b commit: 4e0982a00564c80cb849a892043450860ef91e14 [1/1] fs/epoll: simplify ep_send_events_proc() ready-list loop config: riscv-randconfig-002-20250218 (https://download.01.org/0day-ci/archive/20250219/202502190725.o1vjuVib-lkp@intel.com/config) compiler: riscv32-linux-gcc (GCC) 14.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250219/202502190725.o1vjuVib-lkp@intel.com/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-kbuild-all/202502190725.o1vjuVib-lkp@intel.com/ All errors (new ones prefixed by >>): fs/eventpoll.c: Assembler messages: >> fs/eventpoll.c:1672: Error: unrecognized opcode `csrs sstatus,s10', extension `zicsr' required >> fs/eventpoll.c:1672: Error: unrecognized opcode `csrc sstatus,s10', extension `zicsr' required fs/eventpoll.c:1673: Error: unrecognized opcode `csrs sstatus,s10', extension `zicsr' required fs/eventpoll.c:1673: Error: unrecognized opcode `csrc sstatus,s10', extension `zicsr' required vim +1672 fs/eventpoll.c ^1da177e4c3f41 Linus Torvalds 2005-04-16 1621 d85e2aa2e34dac Al Viro 2018-02-01 1622 static __poll_t ep_send_events_proc(struct eventpoll *ep, struct list_head *head, 296e236e96ddde Davide Libenzi 2009-03-31 1623 void *priv) ^1da177e4c3f41 Linus Torvalds 2005-04-16 1624 { 5071f97ec6d74f Davide Libenzi 2009-03-31 1625 struct ep_send_events_data *esed = priv; d85e2aa2e34dac Al Viro 2018-02-01 1626 __poll_t revents; 4e0982a00564c8 Davidlohr Bueso 2019-01-03 1627 struct epitem *epi, *tmp; 4e0982a00564c8 Davidlohr Bueso 2019-01-03 1628 struct epoll_event __user *uevent = esed->events; eea1d585917c53 Eric Wong 2013-04-30 1629 struct wakeup_source *ws; 626cf236608505 Hans Verkuil 2012-03-23 1630 poll_table pt; 626cf236608505 Hans Verkuil 2012-03-23 1631 626cf236608505 Hans Verkuil 2012-03-23 1632 init_poll_funcptr(&pt, NULL); 4e0982a00564c8 Davidlohr Bueso 2019-01-03 1633 esed->res = 0; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1634 ^1da177e4c3f41 Linus Torvalds 2005-04-16 1635 /* 5071f97ec6d74f Davide Libenzi 2009-03-31 1636 * We can loop without lock because we are passed a task private list. 5071f97ec6d74f Davide Libenzi 2009-03-31 1637 * Items cannot vanish during the loop because ep_scan_ready_list() is 5071f97ec6d74f Davide Libenzi 2009-03-31 1638 * holding "mtx" during this call. ^1da177e4c3f41 Linus Torvalds 2005-04-16 1639 */ 4e0982a00564c8 Davidlohr Bueso 2019-01-03 1640 list_for_each_entry_safe(epi, tmp, head, rdllink) { 4e0982a00564c8 Davidlohr Bueso 2019-01-03 1641 if (esed->res >= esed->maxevents) 4e0982a00564c8 Davidlohr Bueso 2019-01-03 1642 break; d47de16c722196 Davide Libenzi 2007-05-15 1643 4d7e30d98939a0 Arve Hjønnevåg 2012-05-01 1644 /* 4d7e30d98939a0 Arve Hjønnevåg 2012-05-01 1645 * Activate ep->ws before deactivating epi->ws to prevent 4d7e30d98939a0 Arve Hjønnevåg 2012-05-01 1646 * triggering auto-suspend here (in case we reactive epi->ws 4d7e30d98939a0 Arve Hjønnevåg 2012-05-01 1647 * below). 4d7e30d98939a0 Arve Hjønnevåg 2012-05-01 1648 * 4d7e30d98939a0 Arve Hjønnevåg 2012-05-01 1649 * This could be rearranged to delay the deactivation of epi->ws 4d7e30d98939a0 Arve Hjønnevåg 2012-05-01 1650 * instead, but then epi->ws would temporarily be out of sync 4d7e30d98939a0 Arve Hjønnevåg 2012-05-01 1651 * with ep_is_linked(). 4d7e30d98939a0 Arve Hjønnevåg 2012-05-01 1652 */ eea1d585917c53 Eric Wong 2013-04-30 1653 ws = ep_wakeup_source(epi); eea1d585917c53 Eric Wong 2013-04-30 1654 if (ws) { eea1d585917c53 Eric Wong 2013-04-30 1655 if (ws->active) 4d7e30d98939a0 Arve Hjønnevåg 2012-05-01 1656 __pm_stay_awake(ep->ws); eea1d585917c53 Eric Wong 2013-04-30 1657 __pm_relax(ws); eea1d585917c53 Eric Wong 2013-04-30 1658 } eea1d585917c53 Eric Wong 2013-04-30 1659 d47de16c722196 Davide Libenzi 2007-05-15 1660 list_del_init(&epi->rdllink); ^1da177e4c3f41 Linus Torvalds 2005-04-16 1661 ^1da177e4c3f41 Linus Torvalds 2005-04-16 1662 /* 5071f97ec6d74f Davide Libenzi 2009-03-31 1663 * If the event mask intersect the caller-requested one, 5071f97ec6d74f Davide Libenzi 2009-03-31 1664 * deliver the event to userspace. Again, ep_scan_ready_list() 4e0982a00564c8 Davidlohr Bueso 2019-01-03 1665 * is holding ep->mtx, so no operations coming from userspace 5071f97ec6d74f Davide Libenzi 2009-03-31 1666 * can change the item. ^1da177e4c3f41 Linus Torvalds 2005-04-16 1667 */ 4e0982a00564c8 Davidlohr Bueso 2019-01-03 1668 revents = ep_item_poll(epi, &pt, 1); 4e0982a00564c8 Davidlohr Bueso 2019-01-03 1669 if (!revents) 4e0982a00564c8 Davidlohr Bueso 2019-01-03 1670 continue; 4e0982a00564c8 Davidlohr Bueso 2019-01-03 1671 5071f97ec6d74f Davide Libenzi 2009-03-31 @1672 if (__put_user(revents, &uevent->events) || d0305882825784 Tony Battersby 2009-03-31 1673 __put_user(epi->event.data, &uevent->data)) { d0305882825784 Tony Battersby 2009-03-31 1674 list_add(&epi->rdllink, head); eea1d585917c53 Eric Wong 2013-04-30 1675 ep_pm_stay_awake(epi); d7ebbe46f445d8 Al Viro 2018-02-01 1676 if (!esed->res) d7ebbe46f445d8 Al Viro 2018-02-01 1677 esed->res = -EFAULT; d7ebbe46f445d8 Al Viro 2018-02-01 1678 return 0; d0305882825784 Tony Battersby 2009-03-31 1679 } d7ebbe46f445d8 Al Viro 2018-02-01 1680 esed->res++; 5071f97ec6d74f Davide Libenzi 2009-03-31 1681 uevent++; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1682 if (epi->event.events & EPOLLONESHOT) ^1da177e4c3f41 Linus Torvalds 2005-04-16 1683 epi->event.events &= EP_PRIVATE_BITS; 296e236e96ddde Davide Libenzi 2009-03-31 1684 else if (!(epi->event.events & EPOLLET)) { ^1da177e4c3f41 Linus Torvalds 2005-04-16 1685 /* 296e236e96ddde Davide Libenzi 2009-03-31 1686 * If this file has been added with Level 296e236e96ddde Davide Libenzi 2009-03-31 1687 * Trigger mode, we need to insert back inside 296e236e96ddde Davide Libenzi 2009-03-31 1688 * the ready list, so that the next call to 296e236e96ddde Davide Libenzi 2009-03-31 1689 * epoll_wait() will check again the events 296e236e96ddde Davide Libenzi 2009-03-31 1690 * availability. At this point, no one can insert 296e236e96ddde Davide Libenzi 2009-03-31 1691 * into ep->rdllist besides us. The epoll_ctl() 296e236e96ddde Davide Libenzi 2009-03-31 1692 * callers are locked out by 296e236e96ddde Davide Libenzi 2009-03-31 1693 * ep_scan_ready_list() holding "mtx" and the 296e236e96ddde Davide Libenzi 2009-03-31 1694 * poll callback will queue them in ep->ovflist. ^1da177e4c3f41 Linus Torvalds 2005-04-16 1695 */ d47de16c722196 Davide Libenzi 2007-05-15 1696 list_add_tail(&epi->rdllink, &ep->rdllist); eea1d585917c53 Eric Wong 2013-04-30 1697 ep_pm_stay_awake(epi); ^1da177e4c3f41 Linus Torvalds 2005-04-16 1698 } 9ce209d64d820a Davide Libenzi 2008-10-17 1699 } 6192bd536f96c6 Davide Libenzi 2007-05-08 1700 d7ebbe46f445d8 Al Viro 2018-02-01 1701 return 0; 6192bd536f96c6 Davide Libenzi 2007-05-08 1702 } d47de16c722196 Davide Libenzi 2007-05-15 1703 :::::: The code at line 1672 was first introduced by commit :::::: 5071f97ec6d74f006072de0ce89b67c8792fe5a1 epoll: fix epoll's own poll :::::: TO: Davide Libenzi :::::: CC: Linus Torvalds -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki