[vbabka-slab:slab/for-next 11/12] mm/slub.c:3256:14: error: call to undeclared function 'node_nr_objs'; ISO C99 and later do not support implicit function declarations

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

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab.git slab/for-next
head:   b6f00c4ef02065161c09fdf560e492cfbb1fec0a
commit: 1c5610f451be71ca2f8b9c6b86ef4712aeed6437 [11/12] slub: introduce count_partial_free_approx()
config: arm-mps2_defconfig (https://download.01.org/0day-ci/archive/20240423/202404231035.P6HbfrHW-lkp@intel.com/config)
compiler: clang version 19.0.0git (https://github.com/llvm/llvm-project 5ef5eb66fb428aaf61fb51b709f065c069c11242)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240423/202404231035.P6HbfrHW-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/202404231035.P6HbfrHW-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from mm/slub.c:13:
   In file included from include/linux/mm.h:2208:
   include/linux/vmstat.h:522:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     522 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
>> mm/slub.c:3256:14: error: call to undeclared function 'node_nr_objs'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    3256 |                 x = min(x, node_nr_objs(n));
         |                            ^
   mm/slub.c:3256:14: note: did you mean 'node_nr_slabs'?
   mm/slub.c:1862:29: note: 'node_nr_slabs' declared here
    1862 | static inline unsigned long node_nr_slabs(struct kmem_cache_node *n)
         |                             ^
>> mm/slub.c:3256:7: error: static assertion failed due to requirement '__builtin_choose_expr((sizeof(int) == sizeof (*(8 ? ((void *)((long)((((unsigned long)(-1)) < (unsigned long)1)) * 0L)) : (int *)8))), (((unsigned long)(-1)) < (unsigned long)1), 0) == __builtin_choose_expr((sizeof(int) == sizeof (*(8 ? ((void *)((long)((((int)(-1)) < (int)1)) * 0L)) : (int *)8))), (((int)(-1)) < (int)1), 0) || __builtin_choose_expr((sizeof(int) == sizeof (*(8 ? ((void *)((long)((((unsigned long)(-1)) < (unsigned long)1)) * 0L)) : (int *)8))), (((unsigned long)(-1)) < (unsigned long)1), 0) == __builtin_choose_expr((sizeof(int) == sizeof (*(8 ? ((void *)((long)((((int)(-1)) < (int)1)) * 0L)) : (int *)8))), (((int)(-1)) < (int)1), 0) || (__builtin_choose_expr((sizeof(int) == sizeof (*(8 ? ((void *)((long)(x) * 0L)) : (int *)8))) && __builtin_choose_expr((sizeof(int) == sizeof (*(8 ? ((void *)((long)((((unsigned long)(-1)) < (unsigned long)1)) * 0L)) : (int *)8))), (((unsigned long)(-1)) < (unsigned long)1), 0), x, -1) >= 0) || (__builtin_choose_expr((sizeof(int) == sizeof (*(8 ? ((void *)((long)(node_nr_objs(n)) * 0L)) : (int *)8))) && __builtin_choose_expr((sizeof(int) == sizeof (*(8 ? ((void *)((long)((((int)(-1)) < (int)1)) * 0L)) : (int *)8))), (((int)(-1)) < (int)1), 0), node_nr_objs(n), -1) >= 0)': min(x, node_nr_objs(n)) signedness error, fix types or consider umin() before min_t()
    3256 |                 x = min(x, node_nr_objs(n));
         |                     ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:85:19: note: expanded from macro 'min'
      85 | #define min(x, y)       __careful_cmp(min, x, y)
         |                         ^~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:58:3: note: expanded from macro '__careful_cmp'
      58 |                 __cmp_once(op, x, y, __UNIQUE_ID(__x), __UNIQUE_ID(__y)))
         |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:51:16: note: expanded from macro '__cmp_once'
      51 |         static_assert(__types_ok(x, y),                 \
         |         ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      52 |                 #op "(" #x ", " #y ") signedness error, fix types or consider u" #op "() before " #op "_t()"); \
         |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   note: (skipping 1 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
   include/linux/minmax.h:31:2: note: expanded from macro '__is_signed'
      31 |         __builtin_choose_expr(__is_constexpr(is_signed_type(typeof(x))),        \
         |         ^
   include/linux/build_bug.h:77:50: note: expanded from macro 'static_assert'
      77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
         |                                  ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:78:56: note: expanded from macro '__static_assert'
      78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
         |                                                        ^~~~
   1 warning and 2 errors generated.


vim +/node_nr_objs +3256 mm/slub.c

  3226	
  3227	static unsigned long count_partial_free_approx(struct kmem_cache_node *n)
  3228	{
  3229		unsigned long flags;
  3230		unsigned long x = 0;
  3231		struct slab *slab;
  3232	
  3233		spin_lock_irqsave(&n->list_lock, flags);
  3234		if (n->nr_partial <= MAX_PARTIAL_TO_SCAN) {
  3235			list_for_each_entry(slab, &n->partial, slab_list)
  3236				x += slab->objects - slab->inuse;
  3237		} else {
  3238			/*
  3239			 * For a long list, approximate the total count of objects in
  3240			 * it to meet the limit on the number of slabs to scan.
  3241			 * Scan from both the list's head and tail for better accuracy.
  3242			 */
  3243			unsigned long scanned = 0;
  3244	
  3245			list_for_each_entry(slab, &n->partial, slab_list) {
  3246				x += slab->objects - slab->inuse;
  3247				if (++scanned == MAX_PARTIAL_TO_SCAN / 2)
  3248					break;
  3249			}
  3250			list_for_each_entry_reverse(slab, &n->partial, slab_list) {
  3251				x += slab->objects - slab->inuse;
  3252				if (++scanned == MAX_PARTIAL_TO_SCAN)
  3253					break;
  3254			}
  3255			x = mult_frac(x, n->nr_partial, scanned);
> 3256			x = min(x, node_nr_objs(n));
  3257		}
  3258		spin_unlock_irqrestore(&n->list_lock, flags);
  3259		return x;
  3260	}
  3261	

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