linux-kernel - Re: [v4 2/4] mm, oom: cgroup-aware OOM killer

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Message-ID: <201707280527.uGsOPEe0%fengguang.wu@intel.com>
Date:   Fri, 28 Jul 2017 05:41:07 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Roman Gushchin <guro@...com>
Cc:     kbuild-all@...org, linux-mm@...ck.org,
        Roman Gushchin <guro@...com>, Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        David Rientjes <rientjes@...gle.com>,
        Tejun Heo <tj@...nel.org>, kernel-team@...com,
        cgroups@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [v4 2/4] mm, oom: cgroup-aware OOM killer

Hi Roman,

[auto build test ERROR on linus/master]
[also build test ERROR on v4.13-rc2 next-20170727]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Roman-Gushchin/cgroup-aware-OOM-killer/20170728-051627
config: i386-tinyconfig (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   mm/oom_kill.c: In function 'oom_kill_memcg_victim':
>> mm/oom_kill.c:1005:24: error: dereferencing pointer to incomplete type 'struct mem_cgroup'
       if (oc->chosen_memcg->oom_kill_all_tasks)
                           ^~

vim +1005 mm/oom_kill.c

   982	
   983	static bool oom_kill_memcg_victim(struct oom_control *oc)
   984	{
   985		if (oc->chosen) {
   986			if (oc->chosen != (void *)-1UL) {
   987				__oom_kill_process(oc->chosen);
   988				put_task_struct(oc->chosen);
   989				schedule_timeout_killable(1);
   990			}
   991			return true;
   992	
   993		} else if (oc->chosen_memcg) {
   994			if (oc->chosen_memcg == (void *)-1UL)
   995				return true;
   996	
   997			/* Always begin with the biggest task */
   998			oc->chosen_points = 0;
   999			oc->chosen = NULL;
  1000			mem_cgroup_scan_tasks(oc->chosen_memcg, oom_evaluate_task, oc);
  1001			if (oc->chosen && oc->chosen != (void *)-1UL) {
  1002				__oom_kill_process(oc->chosen);
  1003				put_task_struct(oc->chosen);
  1004	
> 1005				if (oc->chosen_memcg->oom_kill_all_tasks)
  1006					mem_cgroup_scan_tasks(oc->chosen_memcg,
  1007							      oom_kill_memcg_member,
  1008							      NULL);
  1009			}
  1010	
  1011			mem_cgroup_put(oc->chosen_memcg);
  1012			oc->chosen_memcg = NULL;
  1013			return true;
  1014	
  1015		} else {
  1016			oc->chosen_points = 0;
  1017			return false;
  1018		}
  1019	}
  1020	

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