linux-kernel - Re: [PATCH v2] cpuset: fix a deadlock due to incomplete patching of cpusets

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Date:   Sat, 29 Jul 2017 12:56:44 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Dima Zavin <dmitriyz@...mo.com>
Cc:     kbuild-all@...org, Christopher Lameter <cl@...ux.com>,
        Li Zefan <lizefan@...wei.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Cliff Spradlin <cspradlin@...mo.com>,
        Mel Gorman <mgorman@...hsingularity.net>
Subject: Re: [PATCH v2] cpuset: fix a deadlock due to incomplete patching of
 cpusets_enabled()

Hi Dima,

[auto build test WARNING on v4.12]
[cannot apply to cgroup/for-next linus/master v4.13-rc2 v4.13-rc1 next-20170728]
[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/Dima-Zavin/cpuset-fix-a-deadlock-due-to-incomplete-patching-of-cpusets_enabled/20170729-123852
config: i386-randconfig-x019-201730 (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 warnings (new ones prefixed by >>):

   In file included from kernel/sched/core.c:13:0:
   include/linux/cpuset.h: In function 'read_mems_allowed_begin':
>> include/linux/cpuset.h:261:9: warning: 'return' with a value, in function returning void
     return 0;
            ^
   include/linux/cpuset.h:259:20: note: declared here
    static inline void read_mems_allowed_begin(struct cpuset_mems_cookie *cookie)
                       ^~~~~~~~~~~~~~~~~~~~~~~

vim +/return +261 include/linux/cpuset.h

58568d2a Miao Xie   2009-06-16  258  
6b828cc9 Dima Zavin 2017-07-27  259  static inline void read_mems_allowed_begin(struct cpuset_mems_cookie *cookie)
c0ff7453 Miao Xie   2010-05-24  260  {
cc9a6c87 Mel Gorman 2012-03-21 @261  	return 0;
c0ff7453 Miao Xie   2010-05-24  262  }
c0ff7453 Miao Xie   2010-05-24  263  

:::::: The code at line 261 was first introduced by commit
:::::: cc9a6c8776615f9c194ccf0b63a0aa5628235545 cpuset: mm: reduce large amounts of memory barrier related damage v3

:::::: TO: Mel Gorman <mgorman@...e.de>
:::::: CC: Linus Torvalds <torvalds@...ux-foundation.org>

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