lib/sys_info.c:154:3: error: call to undeclared function 'ftrace_dump'; ISO C99 and later do not support implicit function declarations

[kernel test robot <lkp@intel.com>]

tree:   https://github.com/intel-lab-lkp/linux/commits/Steven-Rostedt/tracing-Move-non-trace_printk-prototypes-back-to-kernel-h/20260814-235157
head:   5803c3be0223106fdafb05968cefd241bf88fef1
commit: 5803c3be0223106fdafb05968cefd241bf88fef1 tracing: Add CONFIG_TRACE_PRINTK_DEBUGGING to clean up kernel.h
date:   2 days ago
config: x86_64-kexec (https://download.01.org/0day-ci/archive/20260816/202608161529.P5YMPr86-lkp@intel.com/config)
compiler: clang version 22.1.8 (https://github.com/llvm/llvm-project ca7933e47d3a3451d81e72ac174dcb5aa28b59d1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260816/202608161529.P5YMPr86-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 <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202608161529.P5YMPr86-lkp@intel.com/

All errors (new ones prefixed by >>):

>> lib/sys_info.c:154:3: error: call to undeclared function 'ftrace_dump'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     154 |                 ftrace_dump(DUMP_ALL);
         |                 ^
   lib/sys_info.c:154:3: note: did you mean 'ftrace_bug'?
   include/linux/ftrace.h:739:6: note: 'ftrace_bug' declared here
     739 | void ftrace_bug(int err, struct dyn_ftrace *rec);
         |      ^
>> lib/sys_info.c:154:15: error: use of undeclared identifier 'DUMP_ALL'
     154 |                 ftrace_dump(DUMP_ALL);
         |                             ^~~~~~~~
   2 errors generated.
--
>> drivers/tty/sysrq.c:331:2: error: call to undeclared function 'ftrace_dump'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     331 |         ftrace_dump(DUMP_ALL);
         |         ^
   drivers/tty/sysrq.c:331:2: note: did you mean 'ftrace_bug'?
   include/linux/ftrace.h:739:6: note: 'ftrace_bug' declared here
     739 | void ftrace_bug(int err, struct dyn_ftrace *rec);
         |      ^
>> drivers/tty/sysrq.c:331:14: error: use of undeclared identifier 'DUMP_ALL'
     331 |         ftrace_dump(DUMP_ALL);
         |                     ^~~~~~~~
   2 errors generated.
--
   In file included from kernel/rcu/tree.c:4951:
>> kernel/rcu/tree_stall.h:238:3: error: call to undeclared function 'ftrace_dump'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     238 |                 rcu_ftrace_dump(DUMP_ALL);
         |                 ^
   kernel/rcu/rcu.h:337:3: note: expanded from macro 'rcu_ftrace_dump'
     337 |                 ftrace_dump(oops_dump_mode); \
         |                 ^
   kernel/rcu/tree_stall.h:238:3: note: did you mean 'ftrace_bug'?
   kernel/rcu/rcu.h:337:3: note: expanded from macro 'rcu_ftrace_dump'
     337 |                 ftrace_dump(oops_dump_mode); \
         |                 ^
   include/linux/ftrace.h:739:6: note: 'ftrace_bug' declared here
     739 | void ftrace_bug(int err, struct dyn_ftrace *rec);
         |      ^
   In file included from kernel/rcu/tree.c:4951:
>> kernel/rcu/tree_stall.h:238:19: error: use of undeclared identifier 'DUMP_ALL'
     238 |                 rcu_ftrace_dump(DUMP_ALL);
         |                                 ^~~~~~~~
   kernel/rcu/tree_stall.h:859:4: error: call to undeclared function 'ftrace_dump'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     859 |                         rcu_ftrace_dump(DUMP_ALL);
         |                         ^
   kernel/rcu/rcu.h:337:3: note: expanded from macro 'rcu_ftrace_dump'
     337 |                 ftrace_dump(oops_dump_mode); \
         |                 ^
   In file included from kernel/rcu/tree.c:4951:
   kernel/rcu/tree_stall.h:859:20: error: use of undeclared identifier 'DUMP_ALL'
     859 |                         rcu_ftrace_dump(DUMP_ALL);
         |                                         ^~~~~~~~
   4 errors generated.


vim +/ftrace_dump +154 lib/sys_info.c

d747755917bf8ae Feng Tang       2025-07-03  138  
03ef32d665e8a23 Feng Tang       2025-11-13  139  static void __sys_info(unsigned long si_mask)
b76e89e50fc3693 Feng Tang       2025-07-03  140  {
b76e89e50fc3693 Feng Tang       2025-07-03  141  	if (si_mask & SYS_INFO_TASKS)
b76e89e50fc3693 Feng Tang       2025-07-03  142  		show_state();
b76e89e50fc3693 Feng Tang       2025-07-03  143  
b76e89e50fc3693 Feng Tang       2025-07-03  144  	if (si_mask & SYS_INFO_MEM)
b76e89e50fc3693 Feng Tang       2025-07-03  145  		show_mem();
b76e89e50fc3693 Feng Tang       2025-07-03  146  
b76e89e50fc3693 Feng Tang       2025-07-03  147  	if (si_mask & SYS_INFO_TIMERS)
b76e89e50fc3693 Feng Tang       2025-07-03  148  		sysrq_timer_list_show();
b76e89e50fc3693 Feng Tang       2025-07-03  149  
b76e89e50fc3693 Feng Tang       2025-07-03  150  	if (si_mask & SYS_INFO_LOCKS)
b76e89e50fc3693 Feng Tang       2025-07-03  151  		debug_show_all_locks();
b76e89e50fc3693 Feng Tang       2025-07-03  152  
b76e89e50fc3693 Feng Tang       2025-07-03  153  	if (si_mask & SYS_INFO_FTRACE)
b76e89e50fc3693 Feng Tang       2025-07-03 @154  		ftrace_dump(DUMP_ALL);
b76e89e50fc3693 Feng Tang       2025-07-03  155  
760fc597c33d5a7 Andy Shevchenko 2025-10-30  156  	if (si_mask & SYS_INFO_ALL_BT)
b76e89e50fc3693 Feng Tang       2025-07-03  157  		trigger_all_cpu_backtrace();
b76e89e50fc3693 Feng Tang       2025-07-03  158  
b76e89e50fc3693 Feng Tang       2025-07-03  159  	if (si_mask & SYS_INFO_BLOCKED_TASKS)
b76e89e50fc3693 Feng Tang       2025-07-03  160  		show_state_filter(TASK_UNINTERRUPTIBLE);
b76e89e50fc3693 Feng Tang       2025-07-03  161  }
03ef32d665e8a23 Feng Tang       2025-11-13  162  

--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki