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Date: Fri, 4 May 2018 13:07:51 +0200
From: Michal Hocko <mhocko@kernel.org>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>,
        Kirill Tkhai <ktkhai@virtuozzo.com>, akpm@linux-foundation.org,
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        Balbir Singh <balbir@linux.vnet.ibm.com>, Tejun Heo <tj@kernel.org>
Subject: Re: [PATCH] memcg: Replace mm->owner with mm->memcg
Message-ID: <20180504110751.GM4535@dhcp22.suse.cz>
References: <20180426130700.GP17484@dhcp22.suse.cz>
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I am getting the following for nommu with MEMCG=y randconfig:
kernel/fork.o: In function `mm_init':
fork.c:(.text+0x948): undefined reference to `mm_update_memcg'
kernel/fork.o: In function `mmput':
fork.c:(.text+0x119c): undefined reference to `mm_update_memcg'
make: *** [vmlinux] Error 1

I am sorry but I didn't get to look at it much more but I suspect you
just have to move mm_update_memcg up before mem_cgroup_do_precharge.
-- 
Michal Hocko
SUSE Labs