linux-kernel - Re: [PATCH v5 5/5] lib/dlock-list: Make sibling CPUs share the same linked list

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Message-ID: <201608100243.zu4sjVF8%fengguang.wu@intel.com>
Date:	Wed, 10 Aug 2016 02:23:10 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Waiman Long <Waiman.Long@....com>
Cc:	kbuild-all@...org, Alexander Viro <viro@...iv.linux.org.uk>,
	Jan Kara <jack@...e.com>,
	Jeff Layton <jlayton@...chiereds.net>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Tejun Heo <tj@...nel.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andi Kleen <andi@...stfloor.org>,
	Dave Chinner <dchinner@...hat.com>,
	Boqun Feng <boqun.feng@...il.com>,
	Scott J Norton <scott.norton@....com>,
	Douglas Hatch <doug.hatch@....com>,
	Waiman Long <Waiman.Long@....com>
Subject: Re: [PATCH v5 5/5] lib/dlock-list: Make sibling CPUs share the same
 linked list

Hi Waiman,

[auto build test ERROR on linus/master]
[also build test ERROR on v4.8-rc1 next-20160809]
[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/Waiman-Long/vfs-Use-dlock-list-for-SB-s-s_inodes-list/20160810-012457
config: i386-randconfig-s0-201632 (attached as .config)
compiler: gcc-6 (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All error/warnings (new ones prefixed by >>):

   lib/dlock-list.c: In function 'cpu2list_init':
>> lib/dlock-list.c:60:15: error: assignment to expression with array type
     sibling_mask = topology_sibling_cpumask(0);
                  ^
>> lib/dlock-list.c:61:6: warning: the address of 'sibling_mask' will always evaluate as 'true' [-Waddress]
     if (!sibling_mask)
         ^
   lib/dlock-list.c:74:16: error: assignment to expression with array type
      sibling_mask = topology_sibling_cpumask(cpu);
                   ^

vim +60 lib/dlock-list.c

    54		cpumask_var_t sibling_mask;
    55		static struct cpumask mask __initdata;
    56	
    57		/*
    58		 * Check # of sibling CPUs for CPU 0
    59		 */
  > 60		sibling_mask = topology_sibling_cpumask(0);
  > 61		if (!sibling_mask)
    62			goto done;
    63		nr_siblings = cpumask_weight(sibling_mask);
    64		if (nr_siblings == 1)

---
0-DAY kernel test infrastructure                Open Source Technology Center
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