[vbabka:slub-percpu-caches-v4r1-BROKEN 2/6] mm/slub.c:4905:13: warning: 'flush_pca' defined but not used

[vbabka:slub-percpu-caches-v4r1-BROKEN 2/6] mm/slub.c:4905:13: warning: 'flush_pca' defined but not used

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vbabka/linux.git slub-percpu-caches-v4r1-BROKEN
head:   769a361e3d36bf4b006b69c6adbdcd24fe2e470a
commit: 8f3b3550b6d09f88b11b9d89eb1d6a215c48bf98 [2/6] mm/slub: add opt-in percpu array cache of objects
config: openrisc-defconfig (https://download.01.org/0day-ci/archive/20240203/202402032111.AEPLIyDN-lkp@intel.com/config)
compiler: or1k-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240203/202402032111.AEPLIyDN-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/202402032111.AEPLIyDN-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> mm/slub.c:4905:13: warning: 'flush_pca' defined but not used [-Wunused-function]
    4905 | static void flush_pca(struct kmem_cache *s, unsigned int count)
         |             ^~~~~~~~~


vim +/flush_pca +4905 mm/slub.c

  4904	
> 4905	static void flush_pca(struct kmem_cache *s, unsigned int count)
  4906	{
  4907		struct slub_percpu_array *pca;
  4908		unsigned int batch, remaining;
  4909		void *objects[PCA_BATCH_MAX];
  4910		unsigned long flags;
  4911	
  4912		local_lock_irqsave(&s->cpu_array->lock, flags);
  4913		pca = this_cpu_read(s->cpu_array);
  4914	
  4915	next_batch:
  4916		batch = min(count, PCA_BATCH_MAX);
  4917	
  4918		batch = min(batch, pca->used);
  4919	
  4920		for (unsigned int i = 0; i < batch; i++) {
  4921			objects[i] = pca->objects[--pca->used];
  4922		}
  4923	
  4924		remaining = pca->used;
  4925	
  4926		local_unlock_irqrestore(&s->cpu_array->lock, flags);
  4927	
  4928		__kmem_cache_free_bulk(s, batch, &objects[0]);
  4929	
  4930		stat_add(s, PCA_FLUSH, batch);
  4931	
  4932		if (batch < count && remaining > 0) {
  4933			count -= batch;
  4934			local_lock_irqsave(&s->cpu_array->lock, flags);
  4935			pca = this_cpu_read(s->cpu_array);
  4936			goto next_batch;
  4937		}
  4938	}
  4939	

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