Re: [PATCH] Add interface to trigger backtrace on specified CPUs

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

Hi Liu,

kernel test robot noticed the following build errors:

[auto build test ERROR on akpm-mm/mm-nonmm-unstable]
[also build test ERROR on linus/master v6.12-rc7 next-20241113]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Liu-Chao/Add-interface-to-trigger-backtrace-on-specified-CPUs/20241112-210050
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-nonmm-unstable
patch link:    https://lore.kernel.org/r/20241112125609.1406586-1-liuchao173%40huawei.com
patch subject: [PATCH] Add interface to trigger backtrace on specified CPUs
config: s390-allmodconfig (https://download.01.org/0day-ci/archive/20241113/202411132108.ZvhAmel0-lkp@intel.com/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 592c0fe55f6d9a811028b5f3507be91458ab2713)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241113/202411132108.ZvhAmel0-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/202411132108.ZvhAmel0-lkp@intel.com/

All errors (new ones prefixed by >>):

>> kernel/backtrace.c:29:12: error: use of undeclared identifier 'no_llseek'; did you mean 'noop_llseek'?
      29 |         .llseek = no_llseek,
         |                   ^~~~~~~~~
         |                   noop_llseek
   include/linux/fs.h:3241:15: note: 'noop_llseek' declared here
    3241 | extern loff_t noop_llseek(struct file *file, loff_t offset, int whence);
         |               ^
   1 error generated.


vim +29 kernel/backtrace.c

    25	
    26	static const struct file_operations backtrace_fops = {
    27		.owner  = THIS_MODULE,
    28		.write  = backtrace_write,
  > 29		.llseek = no_llseek,
    30	};
    31	

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