tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 926f75c8a5ab70567eb4c2d82fbc96963313e564 commit: 06653d57ff283be627a2c769139d73ecc487810f [5670/6619] printk: nbcon: Add emit function and callback function for atomic printing config: s390-randconfig-r004-20230825 (https://download.01.org/0day-ci/archive/20230920/202309201724.M9BMAQIh-lkp@xxxxxxxxx/config) compiler: s390-linux-gcc (GCC) 11.3.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230920/202309201724.M9BMAQIh-lkp@xxxxxxxxx/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 <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202309201724.M9BMAQIh-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): kernel/printk/printk.c: In function 'console_flush_all': >> kernel/printk/printk.c:2871:24: warning: array subscript 0 is outside array bounds of 'char[0]' [-Warray-bounds] 2871 | char *outbuf = &printk_shared_pbufs.outbuf[0]; | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from kernel/printk/printk.c:61: kernel/printk/internal.h:112:17: note: while referencing 'outbuf' 112 | char outbuf[PRINTK_MESSAGE_MAX]; | ^~~~~~ kernel/printk/printk.c:2851:23: note: defined here 'printk_shared_pbufs' 2851 | struct printk_buffers printk_shared_pbufs; | ^~~~~~~~~~~~~~~~~~~ vim +2871 kernel/printk/printk.c d818b56f77521e kernel/printk/printk.c John Ogness 2023-09-16 2852 2830eec14afd18 kernel/printk/printk.c John Ogness 2023-01-09 2853 /* 2830eec14afd18 kernel/printk/printk.c John Ogness 2023-01-09 2854 * Print one record for the given console. The record printed is whatever 2830eec14afd18 kernel/printk/printk.c John Ogness 2023-01-09 2855 * record is the next available record for the given console. 03a749e628fdbc kernel/printk/printk.c John Ogness 2022-04-21 2856 * a699449bb13b70 kernel/printk/printk.c John Ogness 2022-04-21 2857 * @handover will be set to true if a printk waiter has taken over the fc956ae0de7fa2 kernel/printk/printk.c John Ogness 2022-11-16 2858 * console_lock, in which case the caller is no longer holding both the fc956ae0de7fa2 kernel/printk/printk.c John Ogness 2022-11-16 2859 * console_lock and the SRCU read lock. Otherwise it is set to false. fc956ae0de7fa2 kernel/printk/printk.c John Ogness 2022-11-16 2860 * fc956ae0de7fa2 kernel/printk/printk.c John Ogness 2022-11-16 2861 * @cookie is the cookie from the SRCU read lock. ^1da177e4c3f41 kernel/printk.c Linus Torvalds 2005-04-16 2862 * a699449bb13b70 kernel/printk/printk.c John Ogness 2022-04-21 2863 * Returns false if the given console has no next record to print, otherwise a699449bb13b70 kernel/printk/printk.c John Ogness 2022-04-21 2864 * true. ^1da177e4c3f41 kernel/printk.c Linus Torvalds 2005-04-16 2865 * fc956ae0de7fa2 kernel/printk/printk.c John Ogness 2022-11-16 2866 * Requires the console_lock and the SRCU read lock. ^1da177e4c3f41 kernel/printk.c Linus Torvalds 2005-04-16 2867 */ 2830eec14afd18 kernel/printk/printk.c John Ogness 2023-01-09 2868 static bool console_emit_next_record(struct console *con, bool *handover, int cookie) ^1da177e4c3f41 kernel/printk.c Linus Torvalds 2005-04-16 2869 { 2830eec14afd18 kernel/printk/printk.c John Ogness 2023-01-09 2870 bool is_extended = console_srcu_read_flags(con) & CON_EXTENDED; d818b56f77521e kernel/printk/printk.c John Ogness 2023-09-16 @2871 char *outbuf = &printk_shared_pbufs.outbuf[0]; 2830eec14afd18 kernel/printk/printk.c John Ogness 2023-01-09 2872 struct printk_message pmsg = { d818b56f77521e kernel/printk/printk.c John Ogness 2023-09-16 2873 .pbufs = &printk_shared_pbufs, 2830eec14afd18 kernel/printk/printk.c John Ogness 2023-01-09 2874 }; 2830eec14afd18 kernel/printk/printk.c John Ogness 2023-01-09 2875 unsigned long flags; 896fbe20b4e233 kernel/printk/printk.c John Ogness 2020-07-09 2876 a699449bb13b70 kernel/printk/printk.c John Ogness 2022-04-21 2877 *handover = false; 78944e549d3667 kernel/printk.c Antonino A. Daplas 2006-08-05 2878 ea308da1198f8c kernel/printk/printk.c John Ogness 2023-01-09 2879 if (!printk_get_next_message(&pmsg, con->seq, is_extended, true)) a699449bb13b70 kernel/printk/printk.c John Ogness 2022-04-21 2880 return false; 7ff9554bb578ba kernel/printk.c Kay Sievers 2012-05-03 2881 2830eec14afd18 kernel/printk/printk.c John Ogness 2023-01-09 2882 con->dropped += pmsg.dropped; 896fbe20b4e233 kernel/printk/printk.c John Ogness 2020-07-09 2883 2830eec14afd18 kernel/printk/printk.c John Ogness 2023-01-09 2884 /* Skip messages of formatted length 0. */ 2830eec14afd18 kernel/printk/printk.c John Ogness 2023-01-09 2885 if (pmsg.outbuf_len == 0) { 2830eec14afd18 kernel/printk/printk.c John Ogness 2023-01-09 2886 con->seq = pmsg.seq + 1; 084681d14e429c kernel/printk.c Kay Sievers 2012-06-28 2887 goto skip; 084681d14e429c kernel/printk.c Kay Sievers 2012-06-28 2888 } 649e6ee33f73ba kernel/printk.c Kay Sievers 2012-05-10 2889 c4fcc617e14879 kernel/printk/printk.c John Ogness 2023-01-09 2890 if (con->dropped && !is_extended) { c4fcc617e14879 kernel/printk/printk.c John Ogness 2023-01-09 2891 console_prepend_dropped(&pmsg, con->dropped); c4fcc617e14879 kernel/printk/printk.c John Ogness 2023-01-09 2892 con->dropped = 0; 6fe29354befe4c kernel/printk/printk.c Tejun Heo 2015-06-25 2893 } 7ff9554bb578ba kernel/printk.c Kay Sievers 2012-05-03 2894 dbdda842fe96f8 kernel/printk/printk.c Steven Rostedt (VMware 2018-01-10 2895) /* dbdda842fe96f8 kernel/printk/printk.c Steven Rostedt (VMware 2018-01-10 2896) * While actively printing out messages, if another printk() dbdda842fe96f8 kernel/printk/printk.c Steven Rostedt (VMware 2018-01-10 2897) * were to occur on another CPU, it may wait for this one to dbdda842fe96f8 kernel/printk/printk.c Steven Rostedt (VMware 2018-01-10 2898) * finish. This task can not be preempted if there is a dbdda842fe96f8 kernel/printk/printk.c Steven Rostedt (VMware 2018-01-10 2899) * waiter waiting to take over. 93d102f094be9b kernel/printk/printk.c John Ogness 2021-07-15 2900 * 93d102f094be9b kernel/printk/printk.c John Ogness 2021-07-15 2901 * Interrupts are disabled because the hand over to a waiter 93d102f094be9b kernel/printk/printk.c John Ogness 2021-07-15 2902 * must not be interrupted until the hand over is completed 93d102f094be9b kernel/printk/printk.c John Ogness 2021-07-15 2903 * (@console_waiter is cleared). dbdda842fe96f8 kernel/printk/printk.c Steven Rostedt (VMware 2018-01-10 2904) */ 93d102f094be9b kernel/printk/printk.c John Ogness 2021-07-15 2905 printk_safe_enter_irqsave(flags); c162d5b4338d72 kernel/printk/printk.c Petr Mladek 2018-01-12 2906 console_lock_spinning_enable(); dbdda842fe96f8 kernel/printk/printk.c Steven Rostedt (VMware 2018-01-10 2907) c4fcc617e14879 kernel/printk/printk.c John Ogness 2023-01-09 2908 /* Do not trace print latency. */ c4fcc617e14879 kernel/printk/printk.c John Ogness 2023-01-09 2909 stop_critical_timings(); c4fcc617e14879 kernel/printk/printk.c John Ogness 2023-01-09 2910 c4fcc617e14879 kernel/printk/printk.c John Ogness 2023-01-09 2911 /* Write everything out to the hardware. */ c4fcc617e14879 kernel/printk/printk.c John Ogness 2023-01-09 2912 con->write(con, outbuf, pmsg.outbuf_len); c4fcc617e14879 kernel/printk/printk.c John Ogness 2023-01-09 2913 2d9ef940f89e0a kernel/printk/printk.c Petr Mladek 2022-06-23 2914 start_critical_timings(); dbdda842fe96f8 kernel/printk/printk.c Steven Rostedt (VMware 2018-01-10 2915) 2830eec14afd18 kernel/printk/printk.c John Ogness 2023-01-09 2916 con->seq = pmsg.seq + 1; a699449bb13b70 kernel/printk/printk.c John Ogness 2022-04-21 2917 fc956ae0de7fa2 kernel/printk/printk.c John Ogness 2022-11-16 2918 *handover = console_lock_spinning_disable_and_check(cookie); c162d5b4338d72 kernel/printk/printk.c Petr Mladek 2018-01-12 2919 printk_safe_exit_irqrestore(flags); a699449bb13b70 kernel/printk/printk.c John Ogness 2022-04-21 2920 skip: a699449bb13b70 kernel/printk/printk.c John Ogness 2022-04-21 2921 return true; a699449bb13b70 kernel/printk/printk.c John Ogness 2022-04-21 2922 } a699449bb13b70 kernel/printk/printk.c John Ogness 2022-04-21 2923 :::::: The code at line 2871 was first introduced by commit :::::: d818b56f77521ecc5e3eda71dc9b2beb3d6681e3 printk: Make static printk buffers available to nbcon :::::: TO: John Ogness <john.ogness@xxxxxxxxxxxxx> :::::: CC: Petr Mladek <pmladek@xxxxxxxx> -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
