[PATCH 03/26] mm/percpu: Annotate static information into meminspect

[kernel test robot]

Hi Eugen,

kernel test robot noticed the following build errors:

[auto build test ERROR on rppt-memblock/fixes]
[also build test ERROR on linus/master v6.18-rc6]
[cannot apply to akpm-mm/mm-everything rppt-memblock/for-next next-20251121]
[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/Eugen-Hristev/kernel-Introduce-meminspect/20251119-235912
base:   https://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock.git fixes
patch link:    https://lore.kernel.org/r/20251119154427.1033475-4-eugen.hristev%40linaro.org
patch subject: [PATCH 03/26] mm/percpu: Annotate static information into meminspect
config: sparc64-allmodconfig (https://download.01.org/0day-ci/archive/20251122/202511220241.7y7acdEZ-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 9e9fe08b16ea2c4d9867fb4974edf2a3776d6ece)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251122/202511220241.7y7acdEZ-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202511220241.7y7acdEZ-lkp@intel.com/

All errors (new ones prefixed by >>):

>> mm/percpu.c:3350:25: error: use of undeclared identifier '__per_cpu_offset'; did you mean '__per_cpu_start'?
    3350 | MEMINSPECT_SIMPLE_ENTRY(__per_cpu_offset);
         |                         ^~~~~~~~~~~~~~~~
         |                         __per_cpu_start
   include/linux/meminspect.h:101:40: note: expanded from macro 'MEMINSPECT_SIMPLE_ENTRY'
     101 |         MEMINSPECT_ENTRY(MEMINSPECT_ID_##sym, sym, sizeof(sym))
         |                                               ^~~
   include/linux/meminspect.h:92:29: note: expanded from macro 'MEMINSPECT_ENTRY'
      92 |                                                .va = (void *)&(sym),            \
         |                                                                ^~~
   include/asm-generic/sections.h:42:13: note: '__per_cpu_start' declared here
      42 | extern char __per_cpu_start[], __per_cpu_end[];
         |             ^
>> mm/percpu.c:3350:25: error: use of undeclared identifier '__per_cpu_offset'; did you mean '__per_cpu_start'?
    3350 | MEMINSPECT_SIMPLE_ENTRY(__per_cpu_offset);
         |                         ^~~~~~~~~~~~~~~~
         |                         __per_cpu_start
   include/linux/meminspect.h:101:52: note: expanded from macro 'MEMINSPECT_SIMPLE_ENTRY'
     101 |         MEMINSPECT_ENTRY(MEMINSPECT_ID_##sym, sym, sizeof(sym))
         |                                                           ^~~
   include/linux/meminspect.h:93:22: note: expanded from macro 'MEMINSPECT_ENTRY'
      93 |                                                .size = (sz),                    \
         |                                                         ^~
   include/asm-generic/sections.h:42:13: note: '__per_cpu_start' declared here
      42 | extern char __per_cpu_start[], __per_cpu_end[];
         |             ^
>> mm/percpu.c:3350:1: error: invalid application of 'sizeof' to an incomplete type 'char[]'
    3350 | MEMINSPECT_SIMPLE_ENTRY(__per_cpu_offset);
         | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/meminspect.h:101:51: note: expanded from macro 'MEMINSPECT_SIMPLE_ENTRY'
     101 |         MEMINSPECT_ENTRY(MEMINSPECT_ID_##sym, sym, sizeof(sym))
         |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~
   include/linux/meminspect.h:93:22: note: expanded from macro 'MEMINSPECT_ENTRY'
      93 |                                                .size = (sz),                    \
         |                                                         ^~
   3 errors generated.


vim +3350 mm/percpu.c

  3349	
> 3350	MEMINSPECT_SIMPLE_ENTRY(__per_cpu_offset);
  3351	/*
  3352	 * pcpu_nr_pages - calculate total number of populated backing pages
  3353	 *
  3354	 * This reflects the number of pages populated to back chunks.  Metadata is
  3355	 * excluded in the number exposed in meminfo as the number of backing pages
  3356	 * scales with the number of cpus and can quickly outweigh the memory used for
  3357	 * metadata.  It also keeps this calculation nice and simple.
  3358	 *
  3359	 * RETURNS:
  3360	 * Total number of populated backing pages in use by the allocator.
  3361	 */
  3362	unsigned long pcpu_nr_pages(void)
  3363	{
  3364		return data_race(READ_ONCE(pcpu_nr_populated)) * pcpu_nr_units;
  3365	}
  3366	

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