tree: https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux.git 20200605-blktrace-fixes-v4 head: 5198fc554bd362e6b4800af7fddd577e0558ed50 commit: 5198fc554bd362e6b4800af7fddd577e0558ed50 [8/8] blktrace: fix debugfs use after free config: nds32-randconfig-r005-20200608 (attached as .config) compiler: nds32le-linux-gcc (GCC) 9.3.0 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 git checkout 5198fc554bd362e6b4800af7fddd577e0558ed50 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=nds32 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All error/warnings (new ones prefixed by >>, old ones prefixed by <<): kernel/trace/blktrace.c: In function 'do_blk_trace_setup': 601 | static int __blk_trace_setup(struct request_queue *q, char *name, dev_t dev, | ^~~~~~~~~~~~~~~~~ 601 | static int __blk_trace_setup(struct request_queue *q, char *name, dev_t dev, | ^~~~~~ In file included from include/linux/linkage.h:7, from include/linux/kernel.h:8, from kernel/trace/blktrace.c:9: 634 | EXPORT_SYMBOL_GPL(blk_trace_setup); | ^~~~~~~~~~~~~~~ include/linux/export.h:98:21: note: in definition of macro '___EXPORT_SYMBOL' 98 | extern typeof(sym) sym; | ^~~ 155 | #define _EXPORT_SYMBOL(sym, sec) __EXPORT_SYMBOL(sym, sec, "") | ^~~~~~~~~~~~~~~ 159 | #define EXPORT_SYMBOL_GPL(sym) _EXPORT_SYMBOL(sym, "_gpl") | ^~~~~~~~~~~~~~ 634 | EXPORT_SYMBOL_GPL(blk_trace_setup); | ^~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:622:5: note: previous definition of 'blk_trace_setup' was here 622 | int blk_trace_setup(struct request_queue *q, char *name, dev_t dev, | ^~~~~~~~~~~~~~~ In file included from include/linux/linkage.h:7, from include/linux/kernel.h:8, from kernel/trace/blktrace.c:9: 67 | static const struct kernel_symbol __ksymtab_##sym | ^~~~~~ 108 | __KSYMTAB_ENTRY(sym, sec) | ^~~~~~~~~~~~~~~ 147 | #define __EXPORT_SYMBOL(sym, sec, ns) ___EXPORT_SYMBOL(sym, sec, ns) | ^~~~~~~~~~~~~~~~ 155 | #define _EXPORT_SYMBOL(sym, sec) __EXPORT_SYMBOL(sym, sec, "") | ^~~~~~~~~~~~~~~ 159 | #define EXPORT_SYMBOL_GPL(sym) _EXPORT_SYMBOL(sym, "_gpl") | ^~~~~~~~~~~~~~ 634 | EXPORT_SYMBOL_GPL(blk_trace_setup); | ^~~~~~~~~~~~~~~~~ 670 | static int __blk_trace_startstop(struct request_queue *q, int start) | ^~~~~~~~~~~~~~~~~~~~~ In file included from include/linux/linkage.h:7, from include/linux/kernel.h:8, from kernel/trace/blktrace.c:9: 722 | EXPORT_SYMBOL_GPL(blk_trace_startstop); | ^~~~~~~~~~~~~~~~~~~ include/linux/export.h:98:21: note: in definition of macro '___EXPORT_SYMBOL' 98 | extern typeof(sym) sym; | ^~~ 155 | #define _EXPORT_SYMBOL(sym, sec) __EXPORT_SYMBOL(sym, sec, "") | ^~~~~~~~~~~~~~~ 159 | #define EXPORT_SYMBOL_GPL(sym) _EXPORT_SYMBOL(sym, "_gpl") | ^~~~~~~~~~~~~~ kernel/trace/blktrace.c:722:1: note: in expansion of macro 'EXPORT_SYMBOL_GPL' 722 | EXPORT_SYMBOL_GPL(blk_trace_startstop); | ^~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:712:5: note: previous definition of 'blk_trace_startstop' was here 712 | int blk_trace_startstop(struct request_queue *q, int start) | ^~~~~~~~~~~~~~~~~~~ In file included from include/linux/linkage.h:7, from include/linux/kernel.h:8, from kernel/trace/blktrace.c:9: 67 | static const struct kernel_symbol __ksymtab_##sym | ^~~~~~ 108 | __KSYMTAB_ENTRY(sym, sec) | ^~~~~~~~~~~~~~~ 147 | #define __EXPORT_SYMBOL(sym, sec, ns) ___EXPORT_SYMBOL(sym, sec, ns) | ^~~~~~~~~~~~~~~~ 155 | #define _EXPORT_SYMBOL(sym, sec) __EXPORT_SYMBOL(sym, sec, "") | ^~~~~~~~~~~~~~~ include/linux/export.h:159:33: note: in expansion of macro '_EXPORT_SYMBOL' 159 | #define EXPORT_SYMBOL_GPL(sym) _EXPORT_SYMBOL(sym, "_gpl") | ^~~~~~~~~~~~~~ kernel/trace/blktrace.c:722:1: note: in expansion of macro 'EXPORT_SYMBOL_GPL' 722 | EXPORT_SYMBOL_GPL(blk_trace_startstop); | ^~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:796:12: error: invalid storage class for function 'blk_trace_bio_get_cgid' 796 | static u64 blk_trace_bio_get_cgid(struct request_queue *q, struct bio *bio) | ^~~~~~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:817:1: error: invalid storage class for function 'blk_trace_request_get_cgid' 817 | blk_trace_request_get_cgid(struct request_queue *q, struct request *rq) | ^~~~~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:841:13: error: invalid storage class for function 'blk_add_trace_rq' 841 | static void blk_add_trace_rq(struct request *rq, int error, | ^~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:863:13: error: invalid storage class for function 'blk_add_trace_rq_insert' 863 | static void blk_add_trace_rq_insert(void *ignore, | ^~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:870:13: error: invalid storage class for function 'blk_add_trace_rq_issue' 870 | static void blk_add_trace_rq_issue(void *ignore, | ^~~~~~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:877:13: error: invalid storage class for function 'blk_add_trace_rq_requeue' 877 | static void blk_add_trace_rq_requeue(void *ignore, | ^~~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:885:13: error: invalid storage class for function 'blk_add_trace_rq_complete' 885 | static void blk_add_trace_rq_complete(void *ignore, struct request *rq, | ^~~~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:903:13: error: invalid storage class for function 'blk_add_trace_bio' 903 | static void blk_add_trace_bio(struct request_queue *q, struct bio *bio, | ^~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:921:13: error: invalid storage class for function 'blk_add_trace_bio_bounce' 921 | static void blk_add_trace_bio_bounce(void *ignore, | ^~~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:927:13: error: invalid storage class for function 'blk_add_trace_bio_complete' 927 | static void blk_add_trace_bio_complete(void *ignore, | ^~~~~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:934:13: error: invalid storage class for function 'blk_add_trace_bio_backmerge' 934 | static void blk_add_trace_bio_backmerge(void *ignore, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:942:13: error: invalid storage class for function 'blk_add_trace_bio_frontmerge' 942 | static void blk_add_trace_bio_frontmerge(void *ignore, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:950:13: error: invalid storage class for function 'blk_add_trace_bio_queue' 950 | static void blk_add_trace_bio_queue(void *ignore, | ^~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:956:13: error: invalid storage class for function 'blk_add_trace_getrq' 956 | static void blk_add_trace_getrq(void *ignore, | ^~~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:975:13: error: invalid storage class for function 'blk_add_trace_sleeprq' 975 | static void blk_add_trace_sleeprq(void *ignore, | ^~~~~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:993:13: error: invalid storage class for function 'blk_add_trace_plug' 993 | static void blk_add_trace_plug(void *ignore, struct request_queue *q) | ^~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:1004:13: error: invalid storage class for function 'blk_add_trace_unplug' 1004 | static void blk_add_trace_unplug(void *ignore, struct request_queue *q, | ^~~~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:1025:13: error: invalid storage class for function 'blk_add_trace_split' 1025 | static void blk_add_trace_split(void *ignore, | ^~~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:1057:13: error: invalid storage class for function 'blk_add_trace_bio_remap' 1057 | static void blk_add_trace_bio_remap(void *ignore, | ^~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:1094:13: error: invalid storage class for function 'blk_add_trace_rq_remap' 1094 | static void blk_add_trace_rq_remap(void *ignore, | ^~~~~~~~~~~~~~~~~~~~~~ In file included from include/linux/linkage.h:7, from include/linux/kernel.h:8, from kernel/trace/blktrace.c:9: kernel/trace/blktrace.c:1148:19: error: non-static declaration of 'blk_add_driver_data' follows static declaration 1148 | EXPORT_SYMBOL_GPL(blk_add_driver_data); | ^~~~~~~~~~~~~~~~~~~ include/linux/export.h:98:21: note: in definition of macro '___EXPORT_SYMBOL' 98 | extern typeof(sym) sym; | ^~~ include/linux/export.h:155:34: note: in expansion of macro '__EXPORT_SYMBOL' 155 | #define _EXPORT_SYMBOL(sym, sec) __EXPORT_SYMBOL(sym, sec, "") | ^~~~~~~~~~~~~~~ include/linux/export.h:159:33: note: in expansion of macro '_EXPORT_SYMBOL' 159 | #define EXPORT_SYMBOL_GPL(sym) _EXPORT_SYMBOL(sym, "_gpl") | ^~~~~~~~~~~~~~ kernel/trace/blktrace.c:1148:1: note: in expansion of macro 'EXPORT_SYMBOL_GPL' 1148 | EXPORT_SYMBOL_GPL(blk_add_driver_data); | ^~~~~~~~~~~~~~~~~ kernel/trace/blktrace.c:1130:6: note: previous definition of 'blk_add_driver_data' was here 1130 | void blk_add_driver_data(struct request_queue *q, | ^~~~~~~~~~~~~~~~~~~ In file included from include/linux/linkage.h:7, from include/linux/kernel.h:8, from kernel/trace/blktrace.c:9: include/linux/export.h:67:2: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement] 67 | static const struct kernel_symbol __ksymtab_##sym | ^~~~~~ include/linux/export.h:108:2: note: in expansion of macro '__KSYMTAB_ENTRY' 108 | __KSYMTAB_ENTRY(sym, sec) | ^~~~~~~~~~~~~~~ include/linux/export.h:147:39: note: in expansion of macro '___EXPORT_SYMBOL' 147 | #define __EXPORT_SYMBOL(sym, sec, ns) ___EXPORT_SYMBOL(sym, sec, ns) vim +/__blk_trace_setup +601 kernel/trace/blktrace.c 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 600 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 @601 static int __blk_trace_setup(struct request_queue *q, char *name, dev_t dev, 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 602 struct block_device *bdev, char __user *arg) 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 603 { 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 604 struct blk_user_trace_setup buts; 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 605 int ret; 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 606 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 607 ret = copy_from_user(&buts, arg, sizeof(buts)); 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 608 if (ret) 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 609 return -EFAULT; 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 610 d0deef5b14af7d kernel/trace/blktrace.c Shawn Du 2009-04-14 611 ret = do_blk_trace_setup(q, name, dev, bdev, &buts); 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 612 if (ret) 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 613 return ret; 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 614 9a8c28c8311e30 kernel/trace/blktrace.c Dmitry Monakhov 2010-02-27 615 if (copy_to_user(arg, &buts, sizeof(buts))) { 2967acbb257a6a kernel/trace/blktrace.c Jens Axboe 2017-11-19 616 __blk_trace_remove(q); 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 617 return -EFAULT; 9a8c28c8311e30 kernel/trace/blktrace.c Dmitry Monakhov 2010-02-27 618 } 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 619 return 0; 171044d449611c block/blktrace.c Arnd Bergmann 2007-10-09 620 } 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 621 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 622 int blk_trace_setup(struct request_queue *q, char *name, dev_t dev, 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 623 struct block_device *bdev, 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 624 char __user *arg) 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 625 { 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 626 int ret; 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 627 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 628 mutex_lock(&q->blk_trace_mutex); 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 629 ret = __blk_trace_setup(q, name, dev, bdev, arg); 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 630 mutex_unlock(&q->blk_trace_mutex); 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 631 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 632 return ret; 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 633 } 6da127ad0918f9 block/blktrace.c Christof Schmitt 2008-01-11 @634 EXPORT_SYMBOL_GPL(blk_trace_setup); 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 635 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 636 #if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64) 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 637 static int compat_blk_trace_setup(struct request_queue *q, char *name, 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 638 dev_t dev, struct block_device *bdev, 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 639 char __user *arg) 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 640 { 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 641 struct blk_user_trace_setup buts; 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 642 struct compat_blk_user_trace_setup cbuts; 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 643 int ret; 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 644 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 645 if (copy_from_user(&cbuts, arg, sizeof(cbuts))) 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 646 return -EFAULT; 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 647 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 648 buts = (struct blk_user_trace_setup) { 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 649 .act_mask = cbuts.act_mask, 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 650 .buf_size = cbuts.buf_size, 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 651 .buf_nr = cbuts.buf_nr, 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 652 .start_lba = cbuts.start_lba, 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 653 .end_lba = cbuts.end_lba, 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 654 .pid = cbuts.pid, 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 655 }; 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 656 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 657 ret = do_blk_trace_setup(q, name, dev, bdev, &buts); 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 658 if (ret) 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 659 return ret; 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 660 f8c5e94486671f kernel/trace/blktrace.c Chen Gang 2013-11-03 661 if (copy_to_user(arg, &buts.name, ARRAY_SIZE(buts.name))) { 2967acbb257a6a kernel/trace/blktrace.c Jens Axboe 2017-11-19 662 __blk_trace_remove(q); 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 663 return -EFAULT; 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 664 } 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 665 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 666 return 0; 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 667 } 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 668 #endif 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 669 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 @670 static int __blk_trace_startstop(struct request_queue *q, int start) 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 671 { 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 672 int ret; c780e86dd48ef6 kernel/trace/blktrace.c Jan Kara 2020-02-06 673 struct blk_trace *bt; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 674 c780e86dd48ef6 kernel/trace/blktrace.c Jan Kara 2020-02-06 675 bt = rcu_dereference_protected(q->blk_trace, c780e86dd48ef6 kernel/trace/blktrace.c Jan Kara 2020-02-06 676 lockdep_is_held(&q->blk_trace_mutex)); 939b366977d29b block/blktrace.c Arnaldo Carvalho de Melo 2009-02-03 677 if (bt == NULL) 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 678 return -EINVAL; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 679 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 680 /* 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 681 * For starting a trace, we can transition from a setup or stopped 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 682 * trace. For stopping a trace, the state must be running 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 683 */ 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 684 ret = -EINVAL; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 685 if (start) { 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 686 if (bt->trace_state == Blktrace_setup || 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 687 bt->trace_state == Blktrace_stopped) { 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 688 blktrace_seq++; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 689 smp_mb(); 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 690 bt->trace_state = Blktrace_running; a404d5576bbe58 kernel/trace/blktrace.c Jan Kara 2013-09-17 691 spin_lock_irq(&running_trace_lock); a404d5576bbe58 kernel/trace/blktrace.c Jan Kara 2013-09-17 692 list_add(&bt->running_list, &running_trace_list); a404d5576bbe58 kernel/trace/blktrace.c Jan Kara 2013-09-17 693 spin_unlock_irq(&running_trace_lock); be1c63411addba block/blktrace.c Olaf Kirch 2006-12-01 694 be1c63411addba block/blktrace.c Olaf Kirch 2006-12-01 695 trace_note_time(bt); 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 696 ret = 0; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 697 } 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 698 } else { 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 699 if (bt->trace_state == Blktrace_running) { 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 700 bt->trace_state = Blktrace_stopped; a404d5576bbe58 kernel/trace/blktrace.c Jan Kara 2013-09-17 701 spin_lock_irq(&running_trace_lock); a404d5576bbe58 kernel/trace/blktrace.c Jan Kara 2013-09-17 702 list_del_init(&bt->running_list); a404d5576bbe58 kernel/trace/blktrace.c Jan Kara 2013-09-17 703 spin_unlock_irq(&running_trace_lock); 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 704 relay_flush(bt->rchan); 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 705 ret = 0; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 706 } 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 707 } 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 708 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 709 return ret; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 710 } 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 711 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 712 int blk_trace_startstop(struct request_queue *q, int start) 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 713 { 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 714 int ret; 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 715 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 716 mutex_lock(&q->blk_trace_mutex); 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 717 ret = __blk_trace_startstop(q, start); 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 718 mutex_unlock(&q->blk_trace_mutex); 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 719 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 720 return ret; 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 721 } 6da127ad0918f9 block/blktrace.c Christof Schmitt 2008-01-11 @722 EXPORT_SYMBOL_GPL(blk_trace_startstop); 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 723 5acb3cc2c2e9d3 kernel/trace/blktrace.c Waiman Long 2017-09-20 724 /* 5acb3cc2c2e9d3 kernel/trace/blktrace.c Waiman Long 2017-09-20 725 * When reading or writing the blktrace sysfs files, the references to the 5acb3cc2c2e9d3 kernel/trace/blktrace.c Waiman Long 2017-09-20 726 * opened sysfs or device files should prevent the underlying block device 5acb3cc2c2e9d3 kernel/trace/blktrace.c Waiman Long 2017-09-20 727 * from being removed. So no further delete protection is really needed. 5acb3cc2c2e9d3 kernel/trace/blktrace.c Waiman Long 2017-09-20 728 */ 5acb3cc2c2e9d3 kernel/trace/blktrace.c Waiman Long 2017-09-20 729 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 730 /** 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 731 * blk_trace_ioctl: - handle the ioctls associated with tracing 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 732 * @bdev: the block device 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 733 * @cmd: the ioctl cmd 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 734 * @arg: the argument data, if any 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 735 * 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 736 **/ 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 737 int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg) 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 738 { 165125e1e480f9 block/blktrace.c Jens Axboe 2007-07-24 739 struct request_queue *q; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 740 int ret, start = 0; 6da127ad0918f9 block/blktrace.c Christof Schmitt 2008-01-11 741 char b[BDEVNAME_SIZE]; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 742 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 743 q = bdev_get_queue(bdev); 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 744 if (!q) 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 745 return -ENXIO; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 746 5acb3cc2c2e9d3 kernel/trace/blktrace.c Waiman Long 2017-09-20 747 mutex_lock(&q->blk_trace_mutex); 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 748 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 749 switch (cmd) { 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 750 case BLKTRACESETUP: f36f21ecca9ee6 block/blktrace.c Jean Delvare 2008-05-12 751 bdevname(bdev, b); 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 752 ret = __blk_trace_setup(q, b, bdev->bd_dev, bdev, arg); 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 753 break; 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 754 #if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64) 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 755 case BLKTRACESETUP32: 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 756 bdevname(bdev, b); 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 757 ret = compat_blk_trace_setup(q, b, bdev->bd_dev, bdev, arg); 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 758 break; 62c2a7d969f301 kernel/trace/blktrace.c Arnd Bergmann 2010-07-07 759 #endif 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 760 case BLKTRACESTART: 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 761 start = 1; f6d85f04e29859 kernel/trace/blktrace.c Mathieu Malaterre 2019-01-14 762 /* fall through */ 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 763 case BLKTRACESTOP: 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 764 ret = __blk_trace_startstop(q, start); 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 765 break; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 766 case BLKTRACETEARDOWN: 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 767 ret = __blk_trace_remove(q); 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 768 break; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 769 default: 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 770 ret = -ENOTTY; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 771 break; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 772 } 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 773 5acb3cc2c2e9d3 kernel/trace/blktrace.c Waiman Long 2017-09-20 774 mutex_unlock(&q->blk_trace_mutex); 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 775 return ret; 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 776 } 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 777 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 778 /** 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 779 * blk_trace_shutdown: - stop and cleanup trace structures 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 780 * @q: the request queue associated with the device 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 781 * 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 782 **/ 165125e1e480f9 block/blktrace.c Jens Axboe 2007-07-24 783 void blk_trace_shutdown(struct request_queue *q) 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 784 { 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 785 mutex_lock(&q->blk_trace_mutex); c780e86dd48ef6 kernel/trace/blktrace.c Jan Kara 2020-02-06 786 if (rcu_dereference_protected(q->blk_trace, c780e86dd48ef6 kernel/trace/blktrace.c Jan Kara 2020-02-06 787 lockdep_is_held(&q->blk_trace_mutex))) { 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 788 __blk_trace_startstop(q, 0); 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 789 __blk_trace_remove(q); 2056a782f8e7e6 block/blktrace.c Jens Axboe 2006-03-23 790 } 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 791 1f2cac107c591c kernel/trace/blktrace.c Jens Axboe 2017-11-05 792 mutex_unlock(&q->blk_trace_mutex); 6c5c934153513d block/blktrace.c Alexey Dobriyan 2006-09-29 793 } 5f3ea37c7716db block/blktrace.c Arnaldo Carvalho de Melo 2008-10-30 794 ca1136c99b66b1 kernel/trace/blktrace.c Shaohua Li 2017-07-12 795 #ifdef CONFIG_BLK_CGROUP 67c0496e87d193 kernel/trace/blktrace.c Tejun Heo 2019-11-04 @796 static u64 blk_trace_bio_get_cgid(struct request_queue *q, struct bio *bio) ca1136c99b66b1 kernel/trace/blktrace.c Shaohua Li 2017-07-12 797 { c780e86dd48ef6 kernel/trace/blktrace.c Jan Kara 2020-02-06 798 struct blk_trace *bt; ca1136c99b66b1 kernel/trace/blktrace.c Shaohua Li 2017-07-12 799 c780e86dd48ef6 kernel/trace/blktrace.c Jan Kara 2020-02-06 800 /* We don't use the 'bt' value here except as an optimization... */ c780e86dd48ef6 kernel/trace/blktrace.c Jan Kara 2020-02-06 801 bt = rcu_dereference_protected(q->blk_trace, 1); ca1136c99b66b1 kernel/trace/blktrace.c Shaohua Li 2017-07-12 802 if (!bt || !(blk_tracer_flags.val & TRACE_BLK_OPT_CGROUP)) 67c0496e87d193 kernel/trace/blktrace.c Tejun Heo 2019-11-04 803 return 0; ca1136c99b66b1 kernel/trace/blktrace.c Shaohua Li 2017-07-12 804 db6638d7d177a8 kernel/trace/blktrace.c Dennis Zhou 2018-12-05 805 if (!bio->bi_blkg) 67c0496e87d193 kernel/trace/blktrace.c Tejun Heo 2019-11-04 806 return 0; 743210386c0354 kernel/trace/blktrace.c Tejun Heo 2019-11-04 807 return cgroup_id(bio_blkcg(bio)->css.cgroup); ca1136c99b66b1 kernel/trace/blktrace.c Shaohua Li 2017-07-12 808 } ca1136c99b66b1 kernel/trace/blktrace.c Shaohua Li 2017-07-12 809 #else 67c0496e87d193 kernel/trace/blktrace.c Tejun Heo 2019-11-04 810 u64 blk_trace_bio_get_cgid(struct request_queue *q, struct bio *bio) ca1136c99b66b1 kernel/trace/blktrace.c Shaohua Li 2017-07-12 811 { 67c0496e87d193 kernel/trace/blktrace.c Tejun Heo 2019-11-04 812 return 0; ca1136c99b66b1 kernel/trace/blktrace.c Shaohua Li 2017-07-12 813 } ca1136c99b66b1 kernel/trace/blktrace.c Shaohua Li 2017-07-12 814 #endif ca1136c99b66b1 kernel/trace/blktrace.c Shaohua Li 2017-07-12 815 :::::: The code at line 601 was first introduced by commit :::::: 1f2cac107c591c24b60b115d6050adc213d10fc0 blktrace: fix unlocked access to init/start-stop/teardown :::::: TO: Jens Axboe <axboe(a)kernel.dk&gt; :::::: CC: Jens Axboe <axboe(a)kernel.dk&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org