[linux-rt-devel:linux-5.4.y-rt-rebase 125/282] mm/memcontrol.c:2268:11: error: implicit declaration of function 'get_cpu_light'; did you mean 'get_cpu_mask'?

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

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-5.4.y-rt-rebase
head:   964adfc6507208b201ce44e346375624b0b7a65a
commit: a64ba411ef1f57d3b882a4429c28bdff5e12ca63 [125/282] mm/memcontrol: Don't call schedule_work_on in preemption disabled context
config: m68k-allmodconfig (attached as .config)
compiler: m68k-linux-gcc (GCC) 7.5.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout a64ba411ef1f57d3b882a4429c28bdff5e12ca63
        # save the attached .config to linux build tree
        GCC_VERSION=7.5.0 make.cross ARCH=m68k 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>

Note: the linux-rt-devel/linux-5.4.y-rt-rebase HEAD 964adfc6507208b201ce44e346375624b0b7a65a builds fine.
      It only hurts bisectibility.

All errors (new ones prefixed by >>):

   In file included from arch/m68k/include/asm/atomic.h:7:0,
                    from include/linux/atomic.h:7,
                    from include/linux/page_counter.h:5,
                    from mm/memcontrol.c:25:
   mm/memcontrol.c: In function '__invalidate_reclaim_iterators':
   arch/m68k/include/asm/cmpxchg.h:122:3: warning: value computed is not used [-Wunused-value]
     ((__typeof__(*(ptr)))__cmpxchg((ptr), (unsigned long)(o),     \
     ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
       (unsigned long)(n), sizeof(*(ptr))))
       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   mm/memcontrol.c:1161:4: note: in expansion of macro 'cmpxchg'
       cmpxchg(&iter->position,
       ^~~~~~~
   mm/memcontrol.c: In function 'drain_all_stock':
>> mm/memcontrol.c:2268:11: error: implicit declaration of function 'get_cpu_light'; did you mean 'get_cpu_mask'? [-Werror=implicit-function-declaration]
     curcpu = get_cpu_light();
              ^~~~~~~~~~~~~
              get_cpu_mask
>> mm/memcontrol.c:2289:2: error: implicit declaration of function 'put_cpu_light'; did you mean 'fput_light'? [-Werror=implicit-function-declaration]
     put_cpu_light();
     ^~~~~~~~~~~~~
     fput_light
   cc1: some warnings being treated as errors

vim +2268 mm/memcontrol.c

  2250	
  2251	/*
  2252	 * Drains all per-CPU charge caches for given root_memcg resp. subtree
  2253	 * of the hierarchy under it.
  2254	 */
  2255	static void drain_all_stock(struct mem_cgroup *root_memcg)
  2256	{
  2257		int cpu, curcpu;
  2258	
  2259		/* If someone's already draining, avoid adding running more workers. */
  2260		if (!mutex_trylock(&percpu_charge_mutex))
  2261			return;
  2262		/*
  2263		 * Notify other cpus that system-wide "drain" is running
  2264		 * We do not care about races with the cpu hotplug because cpu down
  2265		 * as well as workers from this path always operate on the local
  2266		 * per-cpu data. CPU up doesn't touch memcg_stock at all.
  2267		 */
> 2268		curcpu = get_cpu_light();
  2269		for_each_online_cpu(cpu) {
  2270			struct memcg_stock_pcp *stock = &per_cpu(memcg_stock, cpu);
  2271			struct mem_cgroup *memcg;
  2272			bool flush = false;
  2273	
  2274			rcu_read_lock();
  2275			memcg = stock->cached;
  2276			if (memcg && stock->nr_pages &&
  2277			    mem_cgroup_is_descendant(memcg, root_memcg))
  2278				flush = true;
  2279			rcu_read_unlock();
  2280	
  2281			if (flush &&
  2282			    !test_and_set_bit(FLUSHING_CACHED_CHARGE, &stock->flags)) {
  2283				if (cpu == curcpu)
  2284					drain_local_stock(&stock->work);
  2285				else
  2286					schedule_work_on(cpu, &stock->work);
  2287			}
  2288		}
> 2289		put_cpu_light();
  2290		mutex_unlock(&percpu_charge_mutex);
  2291	}
  2292	

---
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