Re: [PATCH v1 1/4] bpf: Add wakeup_source iterator

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

Hi Samuel,

kernel test robot noticed the following build errors:

[auto build test ERROR on bpf-next/master]
[also build test ERROR on bpf/master shuah-kselftest/next shuah-kselftest/fixes linus/master v6.18 next-20251204]
[cannot apply to bpf-next/net]
[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/Samuel-Wu/bpf-Add-wakeup_source-iterator/20251204-111108
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
patch link:    https://lore.kernel.org/r/20251204025003.3162056-2-wusamuel%40google.com
patch subject: [PATCH v1 1/4] bpf: Add wakeup_source iterator
config: um-randconfig-001-20251205 (https://download.01.org/0day-ci/archive/20251205/202512050548.YLgRm659-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251205/202512050548.YLgRm659-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/202512050548.YLgRm659-lkp@intel.com/

All errors (new ones prefixed by >>):

   kernel/bpf/wakeup_source_iter.c: In function 'wakeup_source_iter_seq_start':
   kernel/bpf/wakeup_source_iter.c:20:20: error: implicit declaration of function 'wakeup_sources_read_lock'; did you mean 'wakeup_source_register'? [-Wimplicit-function-declaration]
      20 |         *srcuidx = wakeup_sources_read_lock();
         |                    ^~~~~~~~~~~~~~~~~~~~~~~~
         |                    wakeup_source_register
   kernel/bpf/wakeup_source_iter.c:22:14: error: implicit declaration of function 'wakeup_sources_walk_start'; did you mean 'wakeup_source_register'? [-Wimplicit-function-declaration]
      22 |         ws = wakeup_sources_walk_start();
         |              ^~~~~~~~~~~~~~~~~~~~~~~~~
         |              wakeup_source_register
>> kernel/bpf/wakeup_source_iter.c:22:12: error: assignment to 'struct wakeup_source *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
      22 |         ws = wakeup_sources_walk_start();
         |            ^
   kernel/bpf/wakeup_source_iter.c:24:22: error: implicit declaration of function 'wakeup_sources_walk_next' [-Wimplicit-function-declaration]
      24 |                 ws = wakeup_sources_walk_next(ws);
         |                      ^~~~~~~~~~~~~~~~~~~~~~~~
   kernel/bpf/wakeup_source_iter.c:24:20: error: assignment to 'struct wakeup_source *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
      24 |                 ws = wakeup_sources_walk_next(ws);
         |                    ^
   kernel/bpf/wakeup_source_iter.c: In function 'wakeup_source_iter_seq_next':
>> kernel/bpf/wakeup_source_iter.c:35:16: error: returning 'int' from a function with return type 'void *' makes pointer from integer without a cast [-Wint-conversion]
      35 |         return wakeup_sources_walk_next(ws);
         |                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
   kernel/bpf/wakeup_source_iter.c: In function 'wakeup_source_iter_seq_stop':
   kernel/bpf/wakeup_source_iter.c:43:17: error: implicit declaration of function 'wakeup_sources_read_unlock' [-Wimplicit-function-declaration]
      43 |                 wakeup_sources_read_unlock(*srcuidx);
         |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~


vim +22 kernel/bpf/wakeup_source_iter.c

    13	
    14	static void *wakeup_source_iter_seq_start(struct seq_file *seq, loff_t *pos)
    15	{
    16		int *srcuidx = seq->private;
    17		struct wakeup_source *ws;
    18		loff_t i;
    19	
    20		*srcuidx = wakeup_sources_read_lock();
    21	
  > 22		ws = wakeup_sources_walk_start();
    23		for (i = 0; ws && i < *pos; i++)
    24			ws = wakeup_sources_walk_next(ws);
    25	
    26		return ws;
    27	}
    28	
    29	static void *wakeup_source_iter_seq_next(struct seq_file *seq, void *v, loff_t *pos)
    30	{
    31		struct wakeup_source *ws = v;
    32	
    33		++*pos;
    34	
  > 35		return wakeup_sources_walk_next(ws);
    36	}
    37	

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