linux-kernel - [hnaz-mm:master 88/435] mm/memcontrol.c:2775:13: error: unused function 'cancel

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Message-ID: <202111052333.8nqyEDXk-lkp@intel.com>
Date:   Fri, 5 Nov 2021 23:21:52 +0800
From:   kernel test robot <lkp@...el.com>
To:     Shakeel Butt <shakeelb@...gle.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, Johannes Weiner <hannes@...xchg.org>,
        Muchun Song <songmuchun@...edance.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: [hnaz-mm:master 88/435] mm/memcontrol.c:2775:13: error: unused
 function 'cancel_charge'

tree:   https://github.com/hnaz/linux-mm master
head:   b8280145cf2a894c873fdf91fb2af474c52ac6cc
commit: 1105665c1f686ecdaccb1981afea6fb27ab6ff61 [88/435] memcg, kmem: further deprecate kmem.limit_in_bytes
config: arm-buildonly-randconfig-r005-20211105 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 847a6807332b13f43704327c2d30103ec0347c77)
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
        # install arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://github.com/hnaz/linux-mm/commit/1105665c1f686ecdaccb1981afea6fb27ab6ff61
        git remote add hnaz-mm https://github.com/hnaz/linux-mm
        git fetch --no-tags hnaz-mm master
        git checkout 1105665c1f686ecdaccb1981afea6fb27ab6ff61
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=arm 

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:2775:13: error: unused function 'cancel_charge' [-Werror,-Wunused-function]
   static void cancel_charge(struct mem_cgroup *memcg, unsigned int nr_pages)
               ^
   mm/memcontrol.c:3341:19: error: unused function 'mem_cgroup_move_swap_account' [-Werror,-Wunused-function]
   static inline int mem_cgroup_move_swap_account(swp_entry_t entry,
                     ^
   2 errors generated.


vim +/cancel_charge +2775 mm/memcontrol.c

c5c8b16b596e15 Muchun Song       2021-06-28  2773  
f0e45fb4da2974 Johannes Weiner   2020-06-03  2774  #if defined(CONFIG_MEMCG_KMEM) || defined(CONFIG_MMU)
00501b531c4723 Johannes Weiner   2014-08-08 @2775  static void cancel_charge(struct mem_cgroup *memcg, unsigned int nr_pages)
a3032a2c15c696 Daisuke Nishimura 2009-12-15  2776  {
ce00a967377baa Johannes Weiner   2014-09-05  2777  	if (mem_cgroup_is_root(memcg))
ce00a967377baa Johannes Weiner   2014-09-05  2778  		return;
ce00a967377baa Johannes Weiner   2014-09-05  2779  
3e32cb2e0a12b6 Johannes Weiner   2014-12-10  2780  	page_counter_uncharge(&memcg->memory, nr_pages);
7941d2145abc4d Johannes Weiner   2016-01-14  2781  	if (do_memsw_account())
3e32cb2e0a12b6 Johannes Weiner   2014-12-10  2782  		page_counter_uncharge(&memcg->memsw, nr_pages);
d01dd17f1067ca KAMEZAWA Hiroyuki 2012-05-29  2783  }
f0e45fb4da2974 Johannes Weiner   2020-06-03  2784  #endif
d01dd17f1067ca KAMEZAWA Hiroyuki 2012-05-29  2785  

:::::: The code at line 2775 was first introduced by commit
:::::: 00501b531c4723972aa11d6d4ebcf8d6552007c8 mm: memcontrol: rewrite charge API

:::::: TO: Johannes Weiner <hannes@...xchg.org>
:::::: CC: Linus Torvalds <torvalds@...ux-foundation.org>

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

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