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From: Andrew Morton <akpm@linux-foundation.org>
To: kbuild test robot <lkp@intel.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
	kbuild-all@01.org, Johannes Weiner <hannes@cmpxchg.org>,
	Michal Hocko <mhocko@kernel.org>,
	Kirill Tkhai <ktkhai@virtuozzo.com>,
	peterz@infradead.org, oleg@redhat.com, viro@zeniv.linux.org.uk,
	mingo@kernel.org, paulmck@linux.vnet.ibm.com,
	keescook@chromium.org, riel@redhat.com, tglx@linutronix.de,
	kirill.shutemov@linux.intel.com, marcos.souza.org@gmail.com,
	hoeun.ryu@gmail.com, pasha.tatashin@oracle.com,
	gs051095@gmail.com, dhowells@redhat.com, rppt@linux.vnet.ibm.com,
	linux-kernel@vger.kernel.org,
	Balbir Singh <balbir@linux.vnet.ibm.com>,
	Tejun Heo <tj@kernel.org>
Subject: Re: [PATCH] memcg: Replace mm->owner with mm->memcg
Date: Mon, 7 May 2018 16:18:01 -0700	[thread overview]
Message-ID: <20180507161801.2641b71f63158839b9c528f3@linux-foundation.org> (raw)
In-Reply-To: <201805052304.9QOZSH4V%fengguang.wu@intel.com>

On Sun, 6 May 2018 00:54:48 +0800 kbuild test robot <lkp@intel.com> wrote:

> Hi Eric,
> 
> Thank you for the patch! Yet something to improve:
> 
> [auto build test ERROR on linus/master]
> [also build test ERROR on v4.17-rc3]
> [cannot apply to next-20180504]
> [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/Eric-W-Biederman/memcg-Replace-mm-owner-with-mm-memcg/20180503-120054
> config: xtensa-nommu_kc705_defconfig (attached as .config)
> compiler: xtensa-de212-elf-gcc (crosstool-NG crosstool-ng-1.23.0-307-g452ee331) 7.3.0
> reproduce:
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # save the attached .config to linux build tree
>         make.cross ARCH=xtensa 
> 
> All errors (new ones prefixed by >>):
> 
>    kernel/fork.o: In function `sighand_ctor':
> >> fork.c:(.text+0x3b0): undefined reference to `mm_update_memcg'
>    kernel/fork.o: In function `mmdrop_async':
>    fork.c:(.text+0x43a): undefined reference to `mm_update_memcg'
>    kernel/fork.o: In function `set_task_stack_end_magic':
>    fork.c:(.text+0x752): undefined reference to `mm_update_memcg'

Due to the combination of CONFIG_MMU=n and CONFIG_MEMCG=y. 
mm/memcontrol.c's mm_update_memcg() depends upon CONFIG_MMU=y.

Is this a valid conbination?  Do we actually support (and test!) memcg
on nommu systems?

  reply	other threads:[~2018-05-07 23:18 UTC|newest]

Thread overview: 96+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-26 11:00 [PATCH 0/4] exit: Make unlikely case in mm_update_next_owner() more scalable Kirill Tkhai
2018-04-26 11:00 ` [PATCH 1/4] exit: Move read_unlock() up in mm_update_next_owner() Kirill Tkhai
2018-04-26 15:01   ` Oleg Nesterov
2018-04-26 11:00 ` [PATCH 2/4] exit: Use rcu instead of get_task_struct() " Kirill Tkhai
2018-04-26 11:00 ` [PATCH 3/4] exit: Rename assign_new_owner label " Kirill Tkhai
2018-04-26 11:01 ` [PATCH 4/4] exit: Lockless iteration over task list " Kirill Tkhai
2018-04-26 12:35   ` Andrea Parri
2018-04-26 13:52     ` Kirill Tkhai
2018-04-26 15:20       ` Peter Zijlstra
2018-04-26 15:56         ` Kirill Tkhai
2018-04-26 15:20       ` Peter Zijlstra
2018-04-26 16:04         ` Kirill Tkhai
2018-04-26 15:29       ` Andrea Parri
2018-04-26 16:11         ` Kirill Tkhai
2018-04-26 13:07 ` [PATCH 0/4] exit: Make unlikely case in mm_update_next_owner() more scalable Michal Hocko
2018-04-26 13:52   ` Oleg Nesterov
2018-04-26 14:07   ` Kirill Tkhai
2018-04-26 15:10     ` Oleg Nesterov
2018-04-26 16:19   ` Eric W. Biederman
2018-04-26 19:28     ` Michal Hocko
2018-04-27  7:08       ` Michal Hocko
2018-04-27 18:05         ` Eric W. Biederman
2018-05-01 17:22           ` Eric W. Biederman
2018-05-01 17:35             ` [RFC][PATCH] memcg: Replace mm->owner with mm->memcg Eric W. Biederman
2018-05-02  8:47               ` Michal Hocko
2018-05-02 13:20                 ` Johannes Weiner
2018-05-02 14:05                   ` Eric W. Biederman
2018-05-02 19:21                   ` [PATCH] " Eric W. Biederman
2018-05-02 21:04                     ` Andrew Morton
2018-05-02 21:35                       ` Eric W. Biederman
2018-05-03 13:33                     ` Oleg Nesterov
2018-05-03 14:39                       ` Eric W. Biederman
2018-05-04 14:20                         ` Oleg Nesterov
2018-05-04 14:36                           ` Eric W. Biederman
2018-05-04 14:54                             ` Oleg Nesterov
2018-05-04 15:49                               ` Eric W. Biederman
2018-05-04 16:22                                 ` Oleg Nesterov
2018-05-04 16:40                                   ` Eric W. Biederman
2018-05-04 17:26                                     ` [PATCH 0/2] mm->owner to mm->memcg fixes Eric W. Biederman
2018-05-04 17:26                                       ` [PATCH 1/2] memcg: Update the mm->memcg maintenance to work when !CONFIG_MMU Eric W. Biederman
2018-05-04 17:27                                       ` [PATCH 2/2] memcg: Close the race between migration and installing bprm->mm as mm Eric W. Biederman
2018-05-09 14:51                                         ` Oleg Nesterov
2018-05-10  3:00                                           ` Eric W. Biederman
2018-05-10 12:14                                       ` [PATCH 0/2] mm->owner to mm->memcg fixes Michal Hocko
2018-05-10 12:18                                         ` Michal Hocko
2018-05-22 12:57                                         ` Michal Hocko
2018-05-23 19:46                                           ` Eric W. Biederman
2018-05-24 11:10                                             ` Michal Hocko
2018-05-24 21:16                                               ` Andrew Morton
2018-05-24 23:37                                                 ` Andrea Parri
2018-05-30 12:17                                                 ` Michal Hocko
2018-05-31 18:41                                                   ` Eric W. Biederman
2018-06-01  1:57                                                     ` [PATCH] memcg: Replace mm->owner with mm->memcg Eric W. Biederman
2018-06-01 14:52                                                       ` [RFC][PATCH 0/2] memcg: Require every task that uses an mm to migrate together Eric W. Biederman
2018-06-01 14:53                                                         ` [RFC][PATCH 1/2] memcg: Ensure every task that uses an mm is in the same memory cgroup Eric W. Biederman
2018-06-01 16:50                                                           ` Tejun Heo
2018-06-01 18:11                                                             ` Eric W. Biederman
2018-06-01 19:16                                                               ` Tejun Heo
2018-06-04 13:01                                                                 ` Michal Hocko
2018-06-04 18:47                                                                   ` Tejun Heo
2018-06-04 19:11                                                                     ` Eric W. Biederman
2018-06-06 11:13                                                           ` Michal Hocko
2018-06-07 11:42                                                             ` Eric W. Biederman
2018-06-07 12:19                                                               ` Michal Hocko
2018-06-01 14:53                                                         ` [RFC][PATCH 2/2] memcgl: Remove dead code now that all tasks of an mm share a memcg Eric W. Biederman
2018-06-01 14:07                                                     ` [PATCH 0/2] mm->owner to mm->memcg fixes Michal Hocko
2018-05-24 21:17                                               ` Andrew Morton
2018-05-30 11:52                                             ` Michal Hocko
2018-05-31 17:43                                               ` Eric W. Biederman
2018-05-07 14:33                                     ` [PATCH] memcg: Replace mm->owner with mm->memcg Oleg Nesterov
2018-05-08  3:15                                       ` Eric W. Biederman
2018-05-09 14:40                                         ` Oleg Nesterov
2018-05-10  3:09                                           ` Eric W. Biederman
2018-05-10  4:03                                             ` [RFC][PATCH] cgroup: Don't mess with tasks in exec Eric W. Biederman
2018-05-10 12:15                                               ` Oleg Nesterov
2018-05-10 12:35                                                 ` Tejun Heo
2018-05-10 12:38                                             ` [PATCH] memcg: Replace mm->owner with mm->memcg Oleg Nesterov
2018-05-04 11:07                     ` Michal Hocko
2018-05-05 16:54                     ` kbuild test robot
2018-05-07 23:18                       ` Andrew Morton [this message]
2018-05-08  2:17                         ` Eric W. Biederman
2018-05-09 21:00                         ` Michal Hocko
2018-05-02 23:59               ` [RFC][PATCH] " Balbir Singh
2018-05-03 15:11                 ` Eric W. Biederman
2018-05-04  4:59                   ` Balbir Singh
2018-05-03 10:52           ` [PATCH 0/4] exit: Make unlikely case in mm_update_next_owner() more scalable Kirill Tkhai
2018-06-01  1:07   ` Eric W. Biederman
2018-06-01 13:57     ` Michal Hocko
2018-06-01 14:32       ` Eric W. Biederman
2018-06-01 15:02         ` Michal Hocko
2018-06-01 15:25           ` Eric W. Biederman
2018-06-04  6:54             ` Michal Hocko
2018-06-04 14:31               ` Eric W. Biederman
2018-06-05  8:15                 ` Michal Hocko
2018-06-05  8:48             ` Kirill Tkhai
2018-06-05 15:36               ` Eric W. Biederman

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