April 2024 - Kernel - mailweb.openeuler.org

[openeuler:openEuler-1.0-LTS 22104/22122] fs/proc/array.c:614:2: warning: 'gtime' may be used uninitialized in this function
by kernel test robot 16 Apr '24

16 Apr '24

tree: https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS head: 5b8899e6883a3bc8649d051cd90b96f37066e356 commit: 4f8730514c736b09927b1b9c08ad946b70639545 [22104/22122] fs/proc: do_task_stat: use sig->stats_lock to gather the threads/children stats config: x86_64-buildonly-randconfig-005-20240416 (https://download.01.org/0day-ci/archive/20240416/202404161806.OZsKNf49-lkp@…) compiler: gcc-10 (Ubuntu 10.5.0-1ubuntu1) 10.5.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240416/202404161806.OZsKNf49-lkp@…) 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 <lkp(a)intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202404161806.OZsKNf49-lkp@intel.com/ 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 >>): In file included from include/linux/sched/signal.h:7, from include/linux/sched/cputime.h:5, from fs/proc/array.c:68: include/linux/signal.h: In function 'sigemptyset': include/linux/signal.h:180:22: warning: this statement may fall through [-Wimplicit-fallthrough=] 180 | case 2: set->sig[1] = 0; | ~~~~~~~~~~~~^~~ include/linux/signal.h:181:2: note: here 181 | case 1: set->sig[0] = 0; | ^~~~ fs/proc/array.c: In function 'do_task_stat': >> fs/proc/array.c:614:2: warning: 'gtime' may be used uninitialized in this function [-Wmaybe-uninitialized] 614 | seq_put_decimal_ull(m, " ", nsec_to_clock_t(gtime)); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >> fs/proc/array.c:567:2: warning: 'maj_flt' may be used uninitialized in this function [-Wmaybe-uninitialized] 567 | seq_put_decimal_ull(m, " ", maj_flt); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >> fs/proc/array.c:565:2: warning: 'min_flt' may be used uninitialized in this function [-Wmaybe-uninitialized] 565 | seq_put_decimal_ull(m, " ", min_flt); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/gtime +614 fs/proc/array.c ^1da177e4c3f41 Linus Torvalds 2005-04-16 432 ee992744ea53db Eric W. Biederman 2008-02-08 433 static int do_task_stat(struct seq_file *m, struct pid_namespace *ns, ee992744ea53db Eric W. Biederman 2008-02-08 434 struct pid *pid, struct task_struct *task, int whole) ^1da177e4c3f41 Linus Torvalds 2005-04-16 435 { b2f73922d11968 Ingo Molnar 2015-09-30 436 unsigned long vsize, eip, esp, wchan = 0; 715be1fce0d964 Jan Engelhardt 2012-05-31 437 int priority, nice; ^1da177e4c3f41 Linus Torvalds 2005-04-16 438 int tty_pgrp = -1, tty_nr = 0; ^1da177e4c3f41 Linus Torvalds 2005-04-16 439 sigset_t sigign, sigcatch; ^1da177e4c3f41 Linus Torvalds 2005-04-16 440 char state; a593d6edeb0a5a Oleg Nesterov 2006-10-02 441 pid_t ppid = 0, pgid = -1, sid = -1; ^1da177e4c3f41 Linus Torvalds 2005-04-16 442 int num_threads = 0; f83ce3e6b02d5e Jake Edge 2009-05-04 443 int permitted; ^1da177e4c3f41 Linus Torvalds 2005-04-16 444 struct mm_struct *mm; ^1da177e4c3f41 Linus Torvalds 2005-04-16 445 unsigned long long start_time; 4f8730514c736b Oleg Nesterov 2024-04-13 446 unsigned long cmin_flt, cmaj_flt, min_flt, maj_flt; 4f8730514c736b Oleg Nesterov 2024-04-13 447 u64 cutime, cstime, cgtime, utime, stime, gtime; ^1da177e4c3f41 Linus Torvalds 2005-04-16 448 unsigned long rsslim = 0; a593d6edeb0a5a Oleg Nesterov 2006-10-02 449 unsigned long flags; 08132d3d089b9a Eric W. Biederman 2024-04-13 450 int exit_code = task->exit_code; 4f8730514c736b Oleg Nesterov 2024-04-13 451 struct signal_struct *sig = task->signal; 4f8730514c736b Oleg Nesterov 2024-04-13 452 unsigned int seq = 1; ^1da177e4c3f41 Linus Torvalds 2005-04-16 453 ^1da177e4c3f41 Linus Torvalds 2005-04-16 454 state = *get_task_state(task); ^1da177e4c3f41 Linus Torvalds 2005-04-16 455 vsize = eip = esp = 0; caaee6234d05a5 Jann Horn 2016-01-20 456 permitted = ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS | PTRACE_MODE_NOAUDIT); ^1da177e4c3f41 Linus Torvalds 2005-04-16 457 mm = get_task_mm(task); ^1da177e4c3f41 Linus Torvalds 2005-04-16 458 if (mm) { ^1da177e4c3f41 Linus Torvalds 2005-04-16 459 vsize = task_vsize(mm); 0a1eb2d474edfe Andy Lutomirski 2016-09-30 460 /* 0a1eb2d474edfe Andy Lutomirski 2016-09-30 461 * esp and eip are intentionally zeroed out. There is no 0a1eb2d474edfe Andy Lutomirski 2016-09-30 462 * non-racy way to read them without freezing the task. 0a1eb2d474edfe Andy Lutomirski 2016-09-30 463 * Programs that need reliable values can use ptrace(2). fd7d56270b526c John Ogness 2017-09-14 464 * fd7d56270b526c John Ogness 2017-09-14 465 * The only exception is if the task is core dumping because fd7d56270b526c John Ogness 2017-09-14 466 * a program is not able to use ptrace(2) in that case. It is fd7d56270b526c John Ogness 2017-09-14 467 * safe because the task has stopped executing permanently. 0a1eb2d474edfe Andy Lutomirski 2016-09-30 468 */ ef7622dbb87776 John Ogness 2019-07-04 469 if (permitted && (task->flags & (PF_EXITING|PF_DUMPCORE))) { 8bb2ee192e482c Alexey Dobriyan 2018-01-18 470 if (try_get_task_stack(task)) { fd7d56270b526c John Ogness 2017-09-14 471 eip = KSTK_EIP(task); fd7d56270b526c John Ogness 2017-09-14 472 esp = KSTK_ESP(task); 8bb2ee192e482c Alexey Dobriyan 2018-01-18 473 put_task_stack(task); 8bb2ee192e482c Alexey Dobriyan 2018-01-18 474 } fd7d56270b526c John Ogness 2017-09-14 475 } f83ce3e6b02d5e Jake Edge 2009-05-04 476 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 477 ^1da177e4c3f41 Linus Torvalds 2005-04-16 478 sigemptyset(&sigign); ^1da177e4c3f41 Linus Torvalds 2005-04-16 479 sigemptyset(&sigcatch); 3cfd0885fac78c Alan Cox 2006-09-29 480 a593d6edeb0a5a Oleg Nesterov 2006-10-02 481 if (lock_task_sighand(task, &flags)) { 915935041281c6 Oleg Nesterov 2006-12-08 482 if (sig->tty) { 5d0fdf1e018998 Alan Cox 2008-04-30 483 struct pid *pgrp = tty_get_pgrp(sig->tty); 5d0fdf1e018998 Alan Cox 2008-04-30 484 tty_pgrp = pid_nr_ns(pgrp, ns); 5d0fdf1e018998 Alan Cox 2008-04-30 485 put_pid(pgrp); 915935041281c6 Oleg Nesterov 2006-12-08 486 tty_nr = new_encode_dev(tty_devnum(sig->tty)); a593d6edeb0a5a Oleg Nesterov 2006-10-02 487 } a593d6edeb0a5a Oleg Nesterov 2006-10-02 488 7e49827cc937a7 Oleg Nesterov 2010-05-26 489 num_threads = get_nr_threads(task); ^1da177e4c3f41 Linus Torvalds 2005-04-16 490 collect_sigign_sigcatch(task, &sigign, &sigcatch); ^1da177e4c3f41 Linus Torvalds 2005-04-16 491 6aa7de059173a9 Mark Rutland 2017-10-23 492 rsslim = READ_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur); a593d6edeb0a5a Oleg Nesterov 2006-10-02 493 ^1da177e4c3f41 Linus Torvalds 2005-04-16 494 if (whole) { 08132d3d089b9a Eric W. Biederman 2024-04-13 495 if (sig->flags & (SIGNAL_GROUP_EXIT | SIGNAL_STOP_STOPPED)) 08132d3d089b9a Eric W. Biederman 2024-04-13 496 exit_code = sig->group_exit_code; ^1da177e4c3f41 Linus Torvalds 2005-04-16 497 } a593d6edeb0a5a Oleg Nesterov 2006-10-02 498 b488893a390edf Pavel Emelyanov 2007-10-18 499 sid = task_session_nr_ns(task, ns); a98fdcef941e10 Oleg Nesterov 2008-01-15 500 ppid = task_tgid_nr_ns(task->real_parent, ns); b488893a390edf Pavel Emelyanov 2007-10-18 501 pgid = task_pgrp_nr_ns(task, ns); a593d6edeb0a5a Oleg Nesterov 2006-10-02 502 a593d6edeb0a5a Oleg Nesterov 2006-10-02 503 unlock_task_sighand(task, &flags); ^1da177e4c3f41 Linus Torvalds 2005-04-16 504 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 505 f83ce3e6b02d5e Jake Edge 2009-05-04 506 if (permitted && (!whole || num_threads < 2)) ^1da177e4c3f41 Linus Torvalds 2005-04-16 507 wchan = get_wchan(task); f59c1abf66d159 Oleg Nesterov 2024-04-13 508 4f8730514c736b Oleg Nesterov 2024-04-13 509 do { 4f8730514c736b Oleg Nesterov 2024-04-13 510 seq++; /* 2 on the 1st/lockless path, otherwise odd */ 4f8730514c736b Oleg Nesterov 2024-04-13 511 flags = read_seqbegin_or_lock_irqsave(&sig->stats_lock, &seq); 4f8730514c736b Oleg Nesterov 2024-04-13 512 4f8730514c736b Oleg Nesterov 2024-04-13 513 cmin_flt = sig->cmin_flt; 4f8730514c736b Oleg Nesterov 2024-04-13 514 cmaj_flt = sig->cmaj_flt; 4f8730514c736b Oleg Nesterov 2024-04-13 515 cutime = sig->cutime; 4f8730514c736b Oleg Nesterov 2024-04-13 516 cstime = sig->cstime; 4f8730514c736b Oleg Nesterov 2024-04-13 517 cgtime = sig->cgtime; 4f8730514c736b Oleg Nesterov 2024-04-13 518 4f8730514c736b Oleg Nesterov 2024-04-13 519 if (whole) { 4f8730514c736b Oleg Nesterov 2024-04-13 520 struct task_struct *t; 4f8730514c736b Oleg Nesterov 2024-04-13 521 4f8730514c736b Oleg Nesterov 2024-04-13 522 min_flt = sig->min_flt; 4f8730514c736b Oleg Nesterov 2024-04-13 523 maj_flt = sig->maj_flt; 4f8730514c736b Oleg Nesterov 2024-04-13 524 gtime = sig->gtime; 4f8730514c736b Oleg Nesterov 2024-04-13 525 4f8730514c736b Oleg Nesterov 2024-04-13 526 rcu_read_lock(); 4f8730514c736b Oleg Nesterov 2024-04-13 527 __for_each_thread(sig, t) { 4f8730514c736b Oleg Nesterov 2024-04-13 528 min_flt += t->min_flt; 4f8730514c736b Oleg Nesterov 2024-04-13 529 maj_flt += t->maj_flt; 4f8730514c736b Oleg Nesterov 2024-04-13 530 gtime += task_gtime(t); 4f8730514c736b Oleg Nesterov 2024-04-13 531 } 4f8730514c736b Oleg Nesterov 2024-04-13 532 rcu_read_unlock(); 4f8730514c736b Oleg Nesterov 2024-04-13 533 } 4f8730514c736b Oleg Nesterov 2024-04-13 534 } while (need_seqretry(&sig->stats_lock, seq)); 4f8730514c736b Oleg Nesterov 2024-04-13 535 done_seqretry_irqrestore(&sig->stats_lock, seq, flags); 4f8730514c736b Oleg Nesterov 2024-04-13 536 f59c1abf66d159 Oleg Nesterov 2024-04-13 537 if (whole) { f59c1abf66d159 Oleg Nesterov 2024-04-13 538 thread_group_cputime_adjusted(task, &utime, &stime); f59c1abf66d159 Oleg Nesterov 2024-04-13 539 } else { f59c1abf66d159 Oleg Nesterov 2024-04-13 540 task_cputime_adjusted(task, &utime, &stime); ^1da177e4c3f41 Linus Torvalds 2005-04-16 541 min_flt = task->min_flt; ^1da177e4c3f41 Linus Torvalds 2005-04-16 542 maj_flt = task->maj_flt; 6fac4829ce0ef9 Frederic Weisbecker 2012-11-13 543 gtime = task_gtime(task); ^1da177e4c3f41 Linus Torvalds 2005-04-16 544 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 545 ^1da177e4c3f41 Linus Torvalds 2005-04-16 546 /* scale priority and nice values from timeslices to -20..20 */ ^1da177e4c3f41 Linus Torvalds 2005-04-16 547 /* to make it look like a "normal" Unix priority/nice value */ ^1da177e4c3f41 Linus Torvalds 2005-04-16 548 priority = task_prio(task); ^1da177e4c3f41 Linus Torvalds 2005-04-16 549 nice = task_nice(task); ^1da177e4c3f41 Linus Torvalds 2005-04-16 550 ^1da177e4c3f41 Linus Torvalds 2005-04-16 551 /* convert nsec -> ticks */ 57e0be041d9e21 Thomas Gleixner 2014-07-16 552 start_time = nsec_to_clock_t(task->real_start_time); ^1da177e4c3f41 Linus Torvalds 2005-04-16 553 d0f02231222b31 Andrei Vagin 2018-04-10 554 seq_put_decimal_ull(m, "", pid_nr_ns(pid, ns)); d0f02231222b31 Andrei Vagin 2018-04-10 555 seq_puts(m, " ("); 88b72b31e15f9d Tejun Heo 2018-05-18 556 proc_task_name(m, task, false); d0f02231222b31 Andrei Vagin 2018-04-10 557 seq_puts(m, ") "); d0f02231222b31 Andrei Vagin 2018-04-10 558 seq_putc(m, state); 75ba1d07fd6a49 Joe Perches 2016-10-07 559 seq_put_decimal_ll(m, " ", ppid); 75ba1d07fd6a49 Joe Perches 2016-10-07 560 seq_put_decimal_ll(m, " ", pgid); 75ba1d07fd6a49 Joe Perches 2016-10-07 561 seq_put_decimal_ll(m, " ", sid); 75ba1d07fd6a49 Joe Perches 2016-10-07 562 seq_put_decimal_ll(m, " ", tty_nr); 75ba1d07fd6a49 Joe Perches 2016-10-07 563 seq_put_decimal_ll(m, " ", tty_pgrp); 75ba1d07fd6a49 Joe Perches 2016-10-07 564 seq_put_decimal_ull(m, " ", task->flags); 75ba1d07fd6a49 Joe Perches 2016-10-07 @565 seq_put_decimal_ull(m, " ", min_flt); 75ba1d07fd6a49 Joe Perches 2016-10-07 566 seq_put_decimal_ull(m, " ", cmin_flt); 75ba1d07fd6a49 Joe Perches 2016-10-07 @567 seq_put_decimal_ull(m, " ", maj_flt); 75ba1d07fd6a49 Joe Perches 2016-10-07 568 seq_put_decimal_ull(m, " ", cmaj_flt); 5613fda9a503cd Frederic Weisbecker 2017-01-31 569 seq_put_decimal_ull(m, " ", nsec_to_clock_t(utime)); 5613fda9a503cd Frederic Weisbecker 2017-01-31 570 seq_put_decimal_ull(m, " ", nsec_to_clock_t(stime)); 5613fda9a503cd Frederic Weisbecker 2017-01-31 571 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cutime)); 5613fda9a503cd Frederic Weisbecker 2017-01-31 572 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cstime)); 75ba1d07fd6a49 Joe Perches 2016-10-07 573 seq_put_decimal_ll(m, " ", priority); 75ba1d07fd6a49 Joe Perches 2016-10-07 574 seq_put_decimal_ll(m, " ", nice); 75ba1d07fd6a49 Joe Perches 2016-10-07 575 seq_put_decimal_ll(m, " ", num_threads); 75ba1d07fd6a49 Joe Perches 2016-10-07 576 seq_put_decimal_ull(m, " ", 0); 75ba1d07fd6a49 Joe Perches 2016-10-07 577 seq_put_decimal_ull(m, " ", start_time); 75ba1d07fd6a49 Joe Perches 2016-10-07 578 seq_put_decimal_ull(m, " ", vsize); 75ba1d07fd6a49 Joe Perches 2016-10-07 579 seq_put_decimal_ull(m, " ", mm ? get_mm_rss(mm) : 0); 75ba1d07fd6a49 Joe Perches 2016-10-07 580 seq_put_decimal_ull(m, " ", rsslim); 75ba1d07fd6a49 Joe Perches 2016-10-07 581 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->start_code : 1) : 0); 75ba1d07fd6a49 Joe Perches 2016-10-07 582 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->end_code : 1) : 0); 75ba1d07fd6a49 Joe Perches 2016-10-07 583 seq_put_decimal_ull(m, " ", (permitted && mm) ? mm->start_stack : 0); 75ba1d07fd6a49 Joe Perches 2016-10-07 584 seq_put_decimal_ull(m, " ", esp); 75ba1d07fd6a49 Joe Perches 2016-10-07 585 seq_put_decimal_ull(m, " ", eip); ^1da177e4c3f41 Linus Torvalds 2005-04-16 586 /* The signal information here is obsolete. ^1da177e4c3f41 Linus Torvalds 2005-04-16 587 * It must be decimal for Linux 2.0 compatibility. ^1da177e4c3f41 Linus Torvalds 2005-04-16 588 * Use /proc/#/status for real-time signals. ^1da177e4c3f41 Linus Torvalds 2005-04-16 589 */ 75ba1d07fd6a49 Joe Perches 2016-10-07 590 seq_put_decimal_ull(m, " ", task->pending.signal.sig[0] & 0x7fffffffUL); 75ba1d07fd6a49 Joe Perches 2016-10-07 591 seq_put_decimal_ull(m, " ", task->blocked.sig[0] & 0x7fffffffUL); 75ba1d07fd6a49 Joe Perches 2016-10-07 592 seq_put_decimal_ull(m, " ", sigign.sig[0] & 0x7fffffffUL); 75ba1d07fd6a49 Joe Perches 2016-10-07 593 seq_put_decimal_ull(m, " ", sigcatch.sig[0] & 0x7fffffffUL); b2f73922d11968 Ingo Molnar 2015-09-30 594 b2f73922d11968 Ingo Molnar 2015-09-30 595 /* b2f73922d11968 Ingo Molnar 2015-09-30 596 * We used to output the absolute kernel address, but that's an b2f73922d11968 Ingo Molnar 2015-09-30 597 * information leak - so instead we show a 0/1 flag here, to signal b2f73922d11968 Ingo Molnar 2015-09-30 598 * to user-space whether there's a wchan field in /proc/PID/wchan. b2f73922d11968 Ingo Molnar 2015-09-30 599 * b2f73922d11968 Ingo Molnar 2015-09-30 600 * This works with older implementations of procps as well. b2f73922d11968 Ingo Molnar 2015-09-30 601 */ b2f73922d11968 Ingo Molnar 2015-09-30 602 if (wchan) b2f73922d11968 Ingo Molnar 2015-09-30 603 seq_puts(m, " 1"); b2f73922d11968 Ingo Molnar 2015-09-30 604 else b2f73922d11968 Ingo Molnar 2015-09-30 605 seq_puts(m, " 0"); b2f73922d11968 Ingo Molnar 2015-09-30 606 75ba1d07fd6a49 Joe Perches 2016-10-07 607 seq_put_decimal_ull(m, " ", 0); 75ba1d07fd6a49 Joe Perches 2016-10-07 608 seq_put_decimal_ull(m, " ", 0); 75ba1d07fd6a49 Joe Perches 2016-10-07 609 seq_put_decimal_ll(m, " ", task->exit_signal); 75ba1d07fd6a49 Joe Perches 2016-10-07 610 seq_put_decimal_ll(m, " ", task_cpu(task)); 75ba1d07fd6a49 Joe Perches 2016-10-07 611 seq_put_decimal_ull(m, " ", task->rt_priority); 75ba1d07fd6a49 Joe Perches 2016-10-07 612 seq_put_decimal_ull(m, " ", task->policy); 75ba1d07fd6a49 Joe Perches 2016-10-07 613 seq_put_decimal_ull(m, " ", delayacct_blkio_ticks(task)); 16a6d9be90373f Frederic Weisbecker 2017-01-31 @614 seq_put_decimal_ull(m, " ", nsec_to_clock_t(gtime)); 16a6d9be90373f Frederic Weisbecker 2017-01-31 615 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cgtime)); 5b172087f99189 Cyrill Gorcunov 2012-05-31 616 5b172087f99189 Cyrill Gorcunov 2012-05-31 617 if (mm && permitted) { 75ba1d07fd6a49 Joe Perches 2016-10-07 618 seq_put_decimal_ull(m, " ", mm->start_data); 75ba1d07fd6a49 Joe Perches 2016-10-07 619 seq_put_decimal_ull(m, " ", mm->end_data); 75ba1d07fd6a49 Joe Perches 2016-10-07 620 seq_put_decimal_ull(m, " ", mm->start_brk); 75ba1d07fd6a49 Joe Perches 2016-10-07 621 seq_put_decimal_ull(m, " ", mm->arg_start); 75ba1d07fd6a49 Joe Perches 2016-10-07 622 seq_put_decimal_ull(m, " ", mm->arg_end); 75ba1d07fd6a49 Joe Perches 2016-10-07 623 seq_put_decimal_ull(m, " ", mm->env_start); 75ba1d07fd6a49 Joe Perches 2016-10-07 624 seq_put_decimal_ull(m, " ", mm->env_end); 5b172087f99189 Cyrill Gorcunov 2012-05-31 625 } else 75ba1d07fd6a49 Joe Perches 2016-10-07 626 seq_puts(m, " 0 0 0 0 0 0 0"); 5b172087f99189 Cyrill Gorcunov 2012-05-31 627 5b172087f99189 Cyrill Gorcunov 2012-05-31 628 if (permitted) 08132d3d089b9a Eric W. Biederman 2024-04-13 629 seq_put_decimal_ll(m, " ", exit_code); 5b172087f99189 Cyrill Gorcunov 2012-05-31 630 else 75ba1d07fd6a49 Joe Perches 2016-10-07 631 seq_puts(m, " 0"); 5b172087f99189 Cyrill Gorcunov 2012-05-31 632 bda7bad62bc4c4 KAMEZAWA Hiroyuki 2012-03-23 633 seq_putc(m, '\n'); ^1da177e4c3f41 Linus Torvalds 2005-04-16 634 if (mm) ^1da177e4c3f41 Linus Torvalds 2005-04-16 635 mmput(mm); ee992744ea53db Eric W. Biederman 2008-02-08 636 return 0; ^1da177e4c3f41 Linus Torvalds 2005-04-16 637 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 638 :::::: The code at line 614 was first introduced by commit :::::: 16a6d9be90373fb0b521850cd0185a4d460dd152 sched/cputime: Convert guest time accounting to nsecs (u64) :::::: TO: Frederic Weisbecker <fweisbec(a)gmail.com> :::::: CC: Ingo Molnar <mingo(a)kernel.org> -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki

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[PATCH openEuler-1.0-LTS] arm64/mpam: Not allowed setting 0 to cache portion bit mask
by Zeng Heng 16 Apr '24

16 Apr '24

hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I9H4YE -------------------------------- Not allowed cache portion to be set to 0, and this kind of operation is not supported by hardware. Fixes: 58e843d94efe ("arm64/mpam: resctrl: Support priority and hardlimit(Memory bandwidth) configuration") Signed-off-by: Zeng Heng <zengheng4(a)huawei.com> --- arch/arm64/kernel/mpam/mpam_resctrl.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/arm64/kernel/mpam/mpam_resctrl.c b/arch/arm64/kernel/mpam/mpam_resctrl.c index 5808ece9ed53..c9882b38fb7e 100644 --- a/arch/arm64/kernel/mpam/mpam_resctrl.c +++ b/arch/arm64/kernel/mpam/mpam_resctrl.c @@ -321,6 +321,11 @@ parse_cache(char *buf, struct resctrl_resource *r, if (data >= rr->ctrl_features[type].max_wd) return -EINVAL; + if (type == SCHEMA_COMM && data == 0) { + rdt_last_cmd_puts("No allowed CPBM to be set to 0\n"); + return -EINVAL; + } + cfg->new_ctrl[type] = data; cfg->ctrl_updated[type] = true; cfg->have_new_ctrl = true; -- 2.25.1

2 1

[PATCH openEuler-1.0-LTS] arm64/mpam: return EOPNOTSUPP when changing rmid of monitor group or resource group with monitor
by Zeng Heng 16 Apr '24

16 Apr '24

hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I9H4XD -------------------------------- Change the error return value to be consistent with the error message semantics. Fixes: 608e83940fe6 ("arm64/mpam: resctrl: add tips when rmid modification failed") Signed-off-by: Zeng Heng <zengheng4(a)huawei.com> --- arch/arm64/kernel/mpam/mpam_resctrl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/kernel/mpam/mpam_resctrl.c b/arch/arm64/kernel/mpam/mpam_resctrl.c index c9882b38fb7e..544468c4177a 100644 --- a/arch/arm64/kernel/mpam/mpam_resctrl.c +++ b/arch/arm64/kernel/mpam/mpam_resctrl.c @@ -1988,7 +1988,7 @@ static ssize_t resctrl_group_rmid_write(struct kernfs_open_file *of, if (rdtgrp->type != RDTCTRL_GROUP || !list_empty(&rdtgrp->mon.crdtgrp_list)) { - ret = -EINVAL; + ret = -EOPNOTSUPP; rdt_last_cmd_puts("unsupported operation\n"); goto unlock; } -- 2.25.1

2 1

[PATCH OLK-5.10 0/2] CVE-2024-26812
by Jinjie Ruan 16 Apr '24

16 Apr '24

CVE-2024-26812 Alex Williamson (2): vfio: Introduce interface to flush virqfd inject workqueue vfio/pci: Create persistent INTx handler drivers/vfio/pci/vfio_pci_intrs.c | 149 ++++++++++++++++-------------- drivers/vfio/virqfd.c | 21 +++++ include/linux/vfio.h | 2 + 3 files changed, 105 insertions(+), 67 deletions(-) -- 2.34.1

2 3

[PATCH OLK-5.10 0/1] wb soft softlockup
by Chen Ridong 16 Apr '24

16 Apr '24

*** BLURB HERE *** Chen Ridong (1): cgroup_writeback: fix softlockup for blkcg->memcg_list mm/backing-dev.c | 15 ++++++++++----- mm/memcontrol.c | 5 ++--- 2 files changed, 12 insertions(+), 8 deletions(-) -- 2.34.1

2 2

[PATCH OLK-5.10 0/1] writeback softlockup
by Chen Ridong 16 Apr '24

16 Apr '24

*** BLURB HERE *** Chen Ridong (1): cgroup_writeback: fix softlockup for blkcg->memcg_list mm/backing-dev.c | 15 ++++++++++----- mm/memcontrol.c | 5 ++--- 2 files changed, 12 insertions(+), 8 deletions(-) -- 2.34.1

2 2

[PATCH openEuler-1.0-LTS 0/1] CVE-2021-47194
by Yongqiang Liu 16 Apr '24

16 Apr '24

Nguyen Dinh Phi (1): cfg80211: call cfg80211_stop_ap when switch from P2P_GO type net/wireless/util.c | 1 + 1 file changed, 1 insertion(+) -- 2.34.1

2 2

[openeuler:OLK-6.6 2699/7415] drivers/platform/mpam/mpam_devices.c:247:11: error: implicit declaration of function '__acpi_get_mem_attribute' is invalid in C99
by kernel test robot 16 Apr '24

16 Apr '24

tree: https://gitee.com/openeuler/kernel.git OLK-6.6 head: e053d517d2275e5ae3f8e80d96fa0bb1727c60a8 commit: 3e9e723f3bf92a19e5e15dda89bbb136ce463294 [2699/7415] arm_mpam: Add probe/remove for mpam msc driver and kbuild boiler plate config: arm64-randconfig-r061-20240416 (https://download.01.org/0day-ci/archive/20240416/202404161519.aROKO5WS-lkp@…) compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project.git f28c006a5895fc0e329fe15fead81e37457cb1d1) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240416/202404161519.aROKO5WS-lkp@…) 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 <lkp(a)intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202404161519.aROKO5WS-lkp@intel.com/ All errors (new ones prefixed by >>): drivers/platform/mpam/mpam_devices.c:212:24: error: no member named 'mon_sel_lock' in 'struct mpam_msc'; did you mean 'part_sel_lock'? spin_lock_init(&msc->mon_sel_lock); ^~~~~~~~~~~~ part_sel_lock include/linux/spinlock.h:335:38: note: expanded from macro 'spin_lock_init' __raw_spin_lock_init(spinlock_check(lock), \ ^ drivers/platform/mpam/mpam_internal.h:43:14: note: 'part_sel_lock' declared here spinlock_t part_sel_lock; ^ >> drivers/platform/mpam/mpam_devices.c:247:11: error: implicit declaration of function '__acpi_get_mem_attribute' is invalid in C99 [-Werror,-Wimplicit-function-declaration] prot = __acpi_get_mem_attribute(msc->pcc_chan->shmem_base_addr); ^ drivers/platform/mpam/mpam_devices.c:247:9: error: assigning to 'pgprot_t' from incompatible type 'int' prot = __acpi_get_mem_attribute(msc->pcc_chan->shmem_base_addr); ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 3 errors generated. vim +/__acpi_get_mem_attribute +247 drivers/platform/mpam/mpam_devices.c 170 171 static int mpam_msc_drv_probe(struct platform_device *pdev) 172 { 173 int err; 174 pgprot_t prot; 175 void * __iomem io; 176 struct mpam_msc *msc; 177 struct resource *msc_res; 178 void *plat_data = pdev->dev.platform_data; 179 180 mutex_lock(&mpam_list_lock); 181 do { 182 msc = devm_kzalloc(&pdev->dev, sizeof(*msc), GFP_KERNEL); 183 if (!msc) { 184 err = -ENOMEM; 185 break; 186 } 187 188 INIT_LIST_HEAD_RCU(&msc->glbl_list); 189 msc->pdev = pdev; 190 191 err = device_property_read_u32(&pdev->dev, "arm,not-ready-us", 192 &msc->nrdy_usec); 193 if (err) { 194 /* This will prevent CSU monitors being usable */ 195 msc->nrdy_usec = 0; 196 } 197 198 err = get_msc_affinity(msc); 199 if (err) 200 break; 201 if (cpumask_empty(&msc->accessibility)) { 202 pr_err_once("msc:%u is not accessible from any CPU!", 203 msc->id); 204 err = -EINVAL; 205 break; 206 } 207 208 mutex_init(&msc->lock); 209 msc->id = mpam_num_msc++; 210 INIT_LIST_HEAD_RCU(&msc->ris); 211 spin_lock_init(&msc->part_sel_lock); 212 spin_lock_init(&msc->mon_sel_lock); 213 214 if (device_property_read_u32(&pdev->dev, "pcc-channel", 215 &msc->pcc_subspace_id)) 216 msc->iface = MPAM_IFACE_MMIO; 217 else 218 msc->iface = MPAM_IFACE_PCC; 219 220 if (msc->iface == MPAM_IFACE_MMIO) { 221 io = devm_platform_get_and_ioremap_resource(pdev, 0, 222 &msc_res); 223 if (IS_ERR(io)) { 224 pr_err("Failed to map MSC base address\n"); 225 devm_kfree(&pdev->dev, msc); 226 err = PTR_ERR(io); 227 break; 228 } 229 msc->mapped_hwpage_sz = msc_res->end - msc_res->start; 230 msc->mapped_hwpage = io; 231 } else if (msc->iface == MPAM_IFACE_PCC) { 232 msc->pcc_cl.dev = &pdev->dev; 233 msc->pcc_cl.rx_callback = mpam_pcc_rx_callback; 234 msc->pcc_cl.tx_block = false; 235 msc->pcc_cl.tx_tout = 1000; /* 1s */ 236 msc->pcc_cl.knows_txdone = false; 237 238 msc->pcc_chan = pcc_mbox_request_channel(&msc->pcc_cl, 239 msc->pcc_subspace_id); 240 if (IS_ERR(msc->pcc_chan)) { 241 pr_err("Failed to request MSC PCC channel\n"); 242 devm_kfree(&pdev->dev, msc); 243 err = PTR_ERR(msc->pcc_chan); 244 break; 245 } 246 > 247 prot = __acpi_get_mem_attribute(msc->pcc_chan->shmem_base_addr); 248 io = ioremap_prot(msc->pcc_chan->shmem_base_addr, 249 msc->pcc_chan->shmem_size, pgprot_val(prot)); 250 if (IS_ERR(io)) { 251 pr_err("Failed to map MSC base address\n"); 252 pcc_mbox_free_channel(msc->pcc_chan); 253 devm_kfree(&pdev->dev, msc); 254 err = PTR_ERR(io); 255 break; 256 } 257 258 /* TODO: issue a read to update the registers */ 259 260 msc->mapped_hwpage_sz = msc->pcc_chan->shmem_size; 261 msc->mapped_hwpage = io + sizeof(struct acpi_pcct_shared_memory); 262 } 263 264 list_add_rcu(&msc->glbl_list, &mpam_all_msc); 265 platform_set_drvdata(pdev, msc); 266 } while (0); 267 mutex_unlock(&mpam_list_lock); 268 269 if (!err) { 270 /* Create RIS entries described by firmware */ 271 if (!acpi_disabled) 272 err = acpi_mpam_parse_resources(msc, plat_data); 273 else 274 err = mpam_dt_parse_resources(msc, plat_data); 275 } 276 277 if (!err && fw_num_msc == mpam_num_msc) 278 mpam_discovery_complete(); 279 280 return err; 281 } 282 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki

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[PATCH v2 openEuler-1.0-LTS] i40e: Fix NULL ptr dereference on VSI filter sync
by Zhang Zekun 16 Apr '24

16 Apr '24

From: Michal Maloszewski <michal.maloszewski(a)intel.com> stable inclusion from stable-v4.19.218 commit 87c421ab4a43433cb009fea44bbbc77f46913e1d category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9FNFW CVE: CVE-2021-47184 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id… ------------------------------------------ [ Upstream commit 37d9e304acd903a445df8208b8a13d707902dea6 ] Remove the reason of null pointer dereference in sync VSI filters. Added new I40E_VSI_RELEASING flag to signalize deleting and releasing of VSI resources to sync this thread with sync filters subtask. Without this patch it is possible to start update the VSI filter list after VSI is removed, that's causing a kernel oops. Fixes: 41c445ff0f48 ("i40e: main driver core") Signed-off-by: Grzegorz Szczurek <grzegorzx.szczurek(a)intel.com> Signed-off-by: Michal Maloszewski <michal.maloszewski(a)intel.com> Reviewed-by: Przemyslaw Patynowski <przemyslawx.patynowski(a)intel.com> Reviewed-by: Witold Fijalkowski <witoldx.fijalkowski(a)intel.com> Reviewed-by: Jaroslaw Gawin <jaroslawx.gawin(a)intel.com> Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov(a)intel.com> Tested-by: Tony Brelinski <tony.brelinski(a)intel.com> Signed-off-by: Tony Nguyen <anthony.l.nguyen(a)intel.com> Signed-off-by: Sasha Levin <sashal(a)kernel.org> Signed-off-by: Zhang Zekun <zhangzekun11(a)huawei.com> --- v2: - change stable-4.19.218 to stable-v4.19.218 drivers/net/ethernet/intel/i40e/i40e.h | 1 + drivers/net/ethernet/intel/i40e/i40e_main.c | 5 +++-- 2 files changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/intel/i40e/i40e.h b/drivers/net/ethernet/intel/i40e/i40e.h index 6fcf51baca13..3bccf23135da 100644 --- a/drivers/net/ethernet/intel/i40e/i40e.h +++ b/drivers/net/ethernet/intel/i40e/i40e.h @@ -166,6 +166,7 @@ enum i40e_vsi_state_t { __I40E_VSI_OVERFLOW_PROMISC, __I40E_VSI_REINIT_REQUESTED, __I40E_VSI_DOWN_REQUESTED, + __I40E_VSI_RELEASING, /* This must be last as it determines the size of the BITMAP */ __I40E_VSI_STATE_SIZE__, }; diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c index a728b6a7872c..fc6550979118 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_main.c +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c @@ -2584,7 +2584,8 @@ static void i40e_sync_filters_subtask(struct i40e_pf *pf) for (v = 0; v < pf->num_alloc_vsi; v++) { if (pf->vsi[v] && - (pf->vsi[v]->flags & I40E_VSI_FLAG_FILTER_CHANGED)) { + (pf->vsi[v]->flags & I40E_VSI_FLAG_FILTER_CHANGED) && + !test_bit(__I40E_VSI_RELEASING, pf->vsi[v]->state)) { int ret = i40e_sync_vsi_filters(pf->vsi[v]); if (ret) { @@ -12425,7 +12426,7 @@ int i40e_vsi_release(struct i40e_vsi *vsi) dev_info(&pf->pdev->dev, "Can't remove PF VSI\n"); return -ENODEV; } - + set_bit(__I40E_VSI_RELEASING, vsi->state); uplink_seid = vsi->uplink_seid; if (vsi->type != I40E_VSI_SRIOV) { if (vsi->netdev_registered) { -- 2.17.1

2 1

[openeuler:openEuler-1.0-LTS 16561/22120] mm/pin_mem.c:34:14: sparse: sparse: symbol 'max_pin_pid_num' was not declared. Should it be static?
by kernel test robot 16 Apr '24

16 Apr '24

tree: https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS head: ab90000f05ebb295378878af0ab18daacb6f3ccf commit: 1a378b87531ea80e7847bf0105adedff28a73080 [16561/22120] mm: add pin memory method for checkpoint add restore config: arm64-randconfig-r111-20240331 (https://download.01.org/0day-ci/archive/20240416/202404161436.ZlpT8TfQ-lkp@…) compiler: aarch64-linux-gcc (GCC) 13.2.0 reproduce: (https://download.01.org/0day-ci/archive/20240416/202404161436.ZlpT8TfQ-lkp@…) 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 <lkp(a)intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202404161436.ZlpT8TfQ-lkp@intel.com/ sparse warnings: (new ones prefixed by >>) >> mm/pin_mem.c:34:14: sparse: sparse: symbol 'max_pin_pid_num' was not declared. Should it be static? >> mm/pin_mem.c:35:15: sparse: sparse: symbol 'redirect_space_size' was not declared. Should it be static? >> mm/pin_mem.c:171:6: sparse: sparse: symbol 'reserve_page_from_buddy' was not declared. Should it be static? >> mm/pin_mem.c:254:6: sparse: sparse: symbol 'free_user_map_pages' was not declared. Should it be static? >> mm/pin_mem.c:311:6: sparse: sparse: symbol 'check_redirect_end_valid' was not declared. Should it be static? >> mm/pin_mem.c:392:5: sparse: sparse: symbol 'calculate_pin_mem_digest' was not declared. Should it be static? >> mm/pin_mem.c:481:5: sparse: sparse: symbol 'collect_pmd_huge_pages' was not declared. Should it be static? >> mm/pin_mem.c:544:5: sparse: sparse: symbol 'collect_normal_pages' was not declared. Should it be static? >> mm/pin_mem.c:610:6: sparse: sparse: symbol 'free_pin_pages' was not declared. Should it be static? >> mm/pin_mem.c:770:12: sparse: sparse: symbol 'remap_normal_pages' was not declared. Should it be static? >> mm/pin_mem.c:857:12: sparse: sparse: symbol 'remap_huge_pmd_pages' was not declared. Should it be static? >> mm/pin_mem.c:844:63: sparse: sparse: not addressable mm/pin_mem.c:846:63: sparse: sparse: not addressable mm/pin_mem.c:848:71: sparse: sparse: not addressable mm/pin_mem.c:851:65: sparse: sparse: not addressable mm/pin_mem.c:171:6: warning: no previous prototype for 'reserve_page_from_buddy' [-Wmissing-prototypes] 171 | void reserve_page_from_buddy(unsigned long nr_pages, struct page *page) | ^~~~~~~~~~~~~~~~~~~~~~~ mm/pin_mem.c:254:6: warning: no previous prototype for 'free_user_map_pages' [-Wmissing-prototypes] 254 | void free_user_map_pages(unsigned int pid_index, unsigned int entry_index, unsigned int page_index) | ^~~~~~~~~~~~~~~~~~~ mm/pin_mem.c:311:6: warning: no previous prototype for 'check_redirect_end_valid' [-Wmissing-prototypes] 311 | bool check_redirect_end_valid(struct redirect_info *redirect_start, | ^~~~~~~~~~~~~~~~~~~~~~~~ mm/pin_mem.c:392:5: warning: no previous prototype for 'calculate_pin_mem_digest' [-Wmissing-prototypes] 392 | int calculate_pin_mem_digest(struct pin_mem_dump_info *pmdi, char *digest) | ^~~~~~~~~~~~~~~~~~~~~~~~ mm/pin_mem.c:481:5: warning: no previous prototype for 'collect_pmd_huge_pages' [-Wmissing-prototypes] 481 | int collect_pmd_huge_pages(struct task_struct *task, | ^~~~~~~~~~~~~~~~~~~~~~ mm/pin_mem.c:544:5: warning: no previous prototype for 'collect_normal_pages' [-Wmissing-prototypes] 544 | int collect_normal_pages(struct task_struct *task, | ^~~~~~~~~~~~~~~~~~~~ mm/pin_mem.c: In function 'collect_normal_pages': mm/pin_mem.c:549:26: warning: variable 'nr_pages' set but not used [-Wunused-but-set-variable] 549 | unsigned long i, nr_pages; | ^~~~~~~~ mm/pin_mem.c: At top level: mm/pin_mem.c:610:6: warning: no previous prototype for 'free_pin_pages' [-Wmissing-prototypes] 610 | void free_pin_pages(struct page_map_entry *pme) | ^~~~~~~~~~~~~~ mm/pin_mem.c:770:12: warning: no previous prototype for 'remap_normal_pages' [-Wmissing-prototypes] 770 | vm_fault_t remap_normal_pages(struct mm_struct *mm, struct vm_area_struct *vma, | ^~~~~~~~~~~~~~~~~~ mm/pin_mem.c: In function 'get_hugepage_gfpmask': mm/pin_mem.c:844:63: error: lvalue required as unary '&' operand 844 | if (test_bit(TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG, &transparent_hugepage_flags)) | ^ mm/pin_mem.c:846:63: error: lvalue required as unary '&' operand 846 | if (test_bit(TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG, &transparent_hugepage_flags)) | ^ mm/pin_mem.c:848:71: error: lvalue required as unary '&' operand 848 | if (test_bit(TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG, &transparent_hugepage_flags)) | ^ mm/pin_mem.c:851:65: error: lvalue required as unary '&' operand 851 | if (test_bit(TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG, &transparent_hugepage_flags)) | ^ mm/pin_mem.c: At top level: mm/pin_mem.c:857:12: warning: no previous prototype for 'remap_huge_pmd_pages' [-Wmissing-prototypes] 857 | vm_fault_t remap_huge_pmd_pages(struct mm_struct *mm, struct vm_area_struct *vma, | ^~~~~~~~~~~~~~~~~~~~ vim +/max_pin_pid_num +34 mm/pin_mem.c 33 > 34 unsigned int max_pin_pid_num __read_mostly; > 35 unsigned long redirect_space_size __read_mostly; 36 static unsigned long redirect_space_start; 37 static void *pin_mem_pagewalk; 38 static unsigned long *pagemap_buffer; 39 static int reserve_user_map_pages_fail; 40 41 static int __init setup_max_pin_pid_num(char *str) 42 { 43 int ret; 44 45 if (!str) 46 return 0; 47 48 ret = kstrtouint(str, 10, &max_pin_pid_num); 49 if (ret) { 50 pr_warn("Unable to parse max pin pid num.\n"); 51 } else { 52 if (max_pin_pid_num > MAX_PIN_PID_NUM) { 53 max_pin_pid_num = 0; 54 pr_warn("Input max_pin_pid_num is too large.\n"); 55 } 56 } 57 return ret; 58 } 59 early_param("max_pin_pid_num", setup_max_pin_pid_num); 60 61 static int __init setup_redirect_space_size(char *str) 62 { 63 if (!str) 64 return 0; 65 66 redirect_space_size = memparse(str, NULL); 67 if (!redirect_space_size) { 68 pr_warn("Unable to parse redirect space size, use the default value.\n"); 69 redirect_space_size = DEFAULT_REDIRECT_SPACE_SIZE; 70 } 71 return 0; 72 } 73 early_param("redirect_space_size", setup_redirect_space_size); 74 75 struct page_map_info *create_page_map_info(int pid) 76 { 77 struct page_map_info *new; 78 79 if (!user_space_reserve_start) 80 return NULL; 81 82 if (pin_pid_num >= max_pin_pid_num) { 83 pr_warn("Pin pid num too large than max_pin_pid_num, fail create: %d!", pid); 84 return NULL; 85 } 86 new = (struct page_map_info *)(user_space_reserve_start + pin_pid_num); 87 new->pid = pid; 88 new->pme = NULL; 89 new->entry_num = 0; 90 new->pid_reserved = false; 91 new->disable_free_page = false; 92 (*pin_pid_num_addr)++; 93 pin_pid_num++; 94 return new; 95 } 96 EXPORT_SYMBOL_GPL(create_page_map_info); 97 98 struct page_map_info *get_page_map_info(int pid) 99 { 100 int i; 101 102 if (!user_space_reserve_start) 103 return NULL; 104 105 for (i = 0; i < pin_pid_num; i++) { 106 if (user_space_reserve_start[i].pid == pid) 107 return &(user_space_reserve_start[i]); 108 } 109 return NULL; 110 } 111 EXPORT_SYMBOL_GPL(get_page_map_info); 112 113 static struct page *find_head_page(struct page *page) 114 { 115 struct page *p = page; 116 117 while (!PageBuddy(p)) { 118 if (PageLRU(p)) 119 return NULL; 120 p--; 121 } 122 return p; 123 } 124 125 static void spilt_page_area_left(struct zone *zone, struct free_area *area, struct page *page, 126 unsigned long size, int order) 127 { 128 unsigned long cur_size = 1 << order; 129 unsigned long total_size = 0; 130 131 while (size && cur_size > size) { 132 cur_size >>= 1; 133 order--; 134 area--; 135 if (cur_size <= size) { 136 list_add(&page[total_size].lru, &area->free_list[MIGRATE_MOVABLE]); 137 atomic_set(&(page[total_size]._mapcount), PAGE_BUDDY_MAPCOUNT_VALUE); 138 set_page_private(&page[total_size], order); 139 set_pageblock_migratetype(&page[total_size], MIGRATE_MOVABLE); 140 area->nr_free++; 141 total_size += cur_size; 142 size -= cur_size; 143 } 144 } 145 } 146 147 static void spilt_page_area_right(struct zone *zone, struct free_area *area, struct page *page, 148 unsigned long size, int order) 149 { 150 unsigned long cur_size = 1 << order; 151 struct page *right_page, *head_page; 152 153 right_page = page + size; 154 while (size && cur_size > size) { 155 cur_size >>= 1; 156 order--; 157 area--; 158 if (cur_size <= size) { 159 head_page = right_page - cur_size; 160 list_add(&head_page->lru, &area->free_list[MIGRATE_MOVABLE]); 161 atomic_set(&(head_page->_mapcount), PAGE_BUDDY_MAPCOUNT_VALUE); 162 set_page_private(head_page, order); 163 set_pageblock_migratetype(head_page, MIGRATE_MOVABLE); 164 area->nr_free++; 165 size -= cur_size; 166 right_page = head_page; 167 } 168 } 169 } 170 > 171 void reserve_page_from_buddy(unsigned long nr_pages, struct page *page) 172 { 173 unsigned int current_order; 174 struct page *page_end; 175 struct free_area *area; 176 struct zone *zone; 177 struct page *head_page; 178 179 head_page = find_head_page(page); 180 if (!head_page) { 181 pr_warn("Find page head fail."); 182 return; 183 } 184 185 current_order = head_page->private; 186 page_end = head_page + (1 << current_order); 187 zone = page_zone(head_page); 188 area = &(zone->free_area[current_order]); 189 list_del(&head_page->lru); 190 atomic_set(&head_page->_mapcount, -1); 191 set_page_private(head_page, 0); 192 area->nr_free--; 193 194 if (head_page != page) 195 spilt_page_area_left(zone, area, head_page, 196 (unsigned long)(page - head_page), current_order); 197 page = page + nr_pages; 198 if (page < page_end) { 199 spilt_page_area_right(zone, area, page, 200 (unsigned long)(page_end - page), current_order); 201 } else if (page > page_end) { 202 pr_warn("Find page end smaller than page."); 203 } 204 } 205 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki

1 0