Messages in this thread | | | Date | Tue, 23 Nov 2021 07:39:13 +0800 | From | kernel test robot <> | Subject | [mcgrof-next:20211116-sysctl-cleanups-v4 3/35] kernel/hung_task.c:69:8: error: redefinition of 'sysctl_hung_task_timeout_secs' |
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tree: https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git 20211116-sysctl-cleanups-v4 head: 5347239461f25fc50aa761923245b9ec4a4aafec commit: e854631643628749ab037f54ca9c26d69ffabb3e [3/35] hung_task: Move hung_task sysctl interface to hung_task.c config: x86_64-randconfig-a003-20211116 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 4c2cf3a314d9131b1b288e7c8ab0c75ac1b2be1d) 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 # https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git/commit/?id=e854631643628749ab037f54ca9c26d69ffabb3e git remote add mcgrof-next https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git git fetch --no-tags mcgrof-next 20211116-sysctl-cleanups-v4 git checkout e854631643628749ab037f54ca9c26d69ffabb3e # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash
If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@intel.com>
All errors (new ones prefixed by >>):
>> kernel/hung_task.c:69:8: error: redefinition of 'sysctl_hung_task_timeout_secs' enum { sysctl_hung_task_timeout_secs = 0 }; ^ kernel/hung_task.c:45:29: note: previous definition is here unsigned long __read_mostly sysctl_hung_task_timeout_secs = CONFIG_DEFAULT_HUNG_TASK_TIMEOUT; ^ >> kernel/hung_task.c:144:7: error: use of undeclared identifier 'sysctl_hung_task_all_cpu_backtrace' if (sysctl_hung_task_all_cpu_backtrace) ^ 2 errors generated.
vim +/sysctl_hung_task_timeout_secs +69 kernel/hung_task.c
60 61 #ifdef CONFIG_SMP 62 /* 63 * Should we dump all CPUs backtraces in a hung task event? 64 * Defaults to 0, can be changed via sysctl. 65 */ 66 unsigned int __read_mostly sysctl_hung_task_all_cpu_backtrace; 67 #else 68 /* Avoid need for ifdefs elsewhere in the code */ > 69 enum { sysctl_hung_task_timeout_secs = 0 }; 70 #endif /* CONFIG_SMP */ 71 72 /* 73 * Should we panic (and reboot, if panic_timeout= is set) when a 74 * hung task is detected: 75 */ 76 unsigned int __read_mostly sysctl_hung_task_panic = 77 CONFIG_BOOTPARAM_HUNG_TASK_PANIC_VALUE; 78 79 static int 80 hung_task_panic(struct notifier_block *this, unsigned long event, void *ptr) 81 { 82 did_panic = 1; 83 84 return NOTIFY_DONE; 85 } 86 87 static struct notifier_block panic_block = { 88 .notifier_call = hung_task_panic, 89 }; 90 91 static void check_hung_task(struct task_struct *t, unsigned long timeout) 92 { 93 unsigned long switch_count = t->nvcsw + t->nivcsw; 94 95 /* 96 * Ensure the task is not frozen. 97 * Also, skip vfork and any other user process that freezer should skip. 98 */ 99 if (unlikely(t->flags & (PF_FROZEN | PF_FREEZER_SKIP))) 100 return; 101 102 /* 103 * When a freshly created task is scheduled once, changes its state to 104 * TASK_UNINTERRUPTIBLE without having ever been switched out once, it 105 * musn't be checked. 106 */ 107 if (unlikely(!switch_count)) 108 return; 109 110 if (switch_count != t->last_switch_count) { 111 t->last_switch_count = switch_count; 112 t->last_switch_time = jiffies; 113 return; 114 } 115 if (time_is_after_jiffies(t->last_switch_time + timeout * HZ)) 116 return; 117 118 trace_sched_process_hang(t); 119 120 if (sysctl_hung_task_panic) { 121 console_verbose(); 122 hung_task_show_lock = true; 123 hung_task_call_panic = true; 124 } 125 126 /* 127 * Ok, the task did not get scheduled for more than 2 minutes, 128 * complain: 129 */ 130 if (sysctl_hung_task_warnings) { 131 if (sysctl_hung_task_warnings > 0) 132 sysctl_hung_task_warnings--; 133 pr_err("INFO: task %s:%d blocked for more than %ld seconds.\n", 134 t->comm, t->pid, (jiffies - t->last_switch_time) / HZ); 135 pr_err(" %s %s %.*s\n", 136 print_tainted(), init_utsname()->release, 137 (int)strcspn(init_utsname()->version, " "), 138 init_utsname()->version); 139 pr_err("\"echo 0 > /proc/sys/kernel/hung_task_timeout_secs\"" 140 " disables this message.\n"); 141 sched_show_task(t); 142 hung_task_show_lock = true; 143 > 144 if (sysctl_hung_task_all_cpu_backtrace) 145 hung_task_show_all_bt = true; 146 } 147 148 touch_nmi_watchdog(); 149 } 150
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