linux-kernel - Re: [PATCH 1/3] mm, memcg: Don't put offlined memcg into local stock

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Date:   Sat, 2 Oct 2021 07:06:12 +0800
From:   kernel test robot <lkp@...el.com>
To:     Waiman Long <longman@...hat.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>, Roman Gushchin <guro@...com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        Linux Memory Management List <linux-mm@...ck.org>,
        linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
        Shakeel Butt <shakeelb@...gle.com>
Subject: Re: [PATCH 1/3] mm, memcg: Don't put offlined memcg into local stock

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: x86_64-randconfig-a016-20211001 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 962e503cc8bc411f7523cc393acae8aae425b1c4)
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=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

>> mm/memcontrol.c:2225:22: error: no member named 'kmem_state' in 'struct mem_cgroup'
           if (unlikely(memcg->kmem_state != KMEM_ONLINE)) {
                        ~~~~~  ^
   include/linux/compiler.h:78:42: note: expanded from macro 'unlikely'
   # define unlikely(x)    __builtin_expect(!!(x), 0)
                                               ^
   1 error generated.


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@lists.01.org

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