Re: [PATCH] mm, proc: make clear_refs killable

From: kbuild test robot <lkp@intel.com>
To: Michal Hocko <mhocko@kernel.org>
Cc: kbuild-all@01.org, LKML <linux-kernel@vger.kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	linux-mm@kvack.org, Michal Hocko <mhocko@suse.com>,
	Oleg Nesterov <oleg@redhat.com>,
	Petr Cermak <petrcermak@chromium.org>
Subject: Re: [PATCH] mm, proc: make clear_refs killable
Date: Tue, 1 Mar 2016 04:25:11 +0800	[thread overview]
Message-ID: <201603010429.Etlkooix%fengguang.wu@intel.com> (raw)
In-Reply-To: <1456768587-24893-1-git-send-email-mhocko@kernel.org>

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Hi Michal,

[auto build test ERROR on v4.5-rc6]
[also build test ERROR on next-20160229]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Michal-Hocko/mm-proc-make-clear_refs-killable/20160301-020426
config: x86_64-lkp (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   fs/proc/task_mmu.c: In function 'clear_refs_write':
>> fs/proc/task_mmu.c:1016:4: error: implicit declaration of function 'down_write_killable' [-Werror=implicit-function-declaration]
       if (down_write_killable(&mm->mmap_sem)) {
       ^
   cc1: some warnings being treated as errors

vim +/down_write_killable +1016 fs/proc/task_mmu.c

  1010				.test_walk = clear_refs_test_walk,
  1011				.mm = mm,
  1012				.private = &cp,
  1013			};
  1014	
  1015			if (type == CLEAR_REFS_MM_HIWATER_RSS) {
> 1016				if (down_write_killable(&mm->mmap_sem)) {
  1017					count = -EINTR;
  1018					goto out_mm;
  1019				}

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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