Hi Waiman,

I love your patch! Yet something to improve:

[auto build test ERROR on hnaz-mm/master]

url:    https://github.com/0day-ci/linux/commits/Waiman-Long/mm-memcg-Miscellaneous-cleanups/20211002-031125
base:   https://github.com/hnaz/linux-mm master
config: nios2-randconfig-r024-20211001 (attached as .config)
compiler: nios2-linux-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/321484dcb4f16ca7bd626adf390222913d188ecc
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Waiman-Long/mm-memcg-Miscellaneous-cleanups/20211002-031125
        git checkout 321484dcb4f16ca7bd626adf390222913d188ecc
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=nios2 SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <redacted>

All errors (new ones prefixed by >>):

   In file included from include/asm-generic/percpu.h:5,
                    from ./arch/nios2/include/generated/asm/percpu.h:1,
                    from include/linux/irqflags.h:17,
                    from include/asm-generic/cmpxchg.h:15,
                    from ./arch/nios2/include/generated/asm/cmpxchg.h:1,
                    from include/asm-generic/atomic.h:12,
                    from ./arch/nios2/include/generated/asm/atomic.h:1,
                    from include/linux/atomic.h:7,
                    from include/linux/page_counter.h:5,
                    from mm/memcontrol.c:28:
   mm/memcontrol.c: In function 'refill_stock':

quoted

mm/memcontrol.c:2225:27: error: 'struct mem_cgroup' has no member named 'kmem_state'

    2225 |         if (unlikely(memcg->kmem_state != KMEM_ONLINE)) {
         |                           ^~
   include/linux/compiler.h:78:45: note: in definition of macro 'unlikely'
      78 | # define unlikely(x)    __builtin_expect(!!(x), 0)
         |                                             ^


vim +2225 mm/memcontrol.c

  2212	
  2213	/*
  2214	 * Cache charges(val) to local per_cpu area.
  2215	 * This will be consumed by consume_stock() function, later.
  2216	 */
  2217	static void refill_stock(struct mem_cgroup *memcg, unsigned int nr_pages)
  2218	{
  2219		struct memcg_stock_pcp *stock;
  2220		unsigned long flags;
  2221	
  2222		/*
  2223		 * An offlined memcg shouldn't be put into stock.
  2224		 */

2225		if (unlikely(memcg->kmem_state != KMEM_ONLINE)) {

  2226			cancel_charge(memcg, nr_pages);
  2227			return;
  2228		}
  2229	
  2230		local_irq_save(flags);
  2231	
  2232		stock = this_cpu_ptr(&memcg_stock);
  2233		if (stock->cached != memcg) { /* reset if necessary */
  2234			drain_stock(stock);
  2235			css_get(&memcg->css);
  2236			stock->cached = memcg;
  2237		}
  2238		stock->nr_pages += nr_pages;
  2239	
  2240		if (stock->nr_pages > MEMCG_CHARGE_BATCH)
  2241			drain_stock(stock);
  2242	
  2243		local_irq_restore(flags);
  2244	}
  2245	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org