linux-kernel - Re: [PATCH 3/6] mm/migrate: Add copy_pages

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Message-ID: <201702172013.pEgvczPM%fengguang.wu@intel.com>
Date:   Fri, 17 Feb 2017 20:27:43 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Anshuman Khandual <khandual@...ux.vnet.ibm.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, mhocko@...e.com, vbabka@...e.cz,
        mgorman@...e.de, minchan@...nel.org,
        aneesh.kumar@...ux.vnet.ibm.com, bsingharora@...il.com,
        srikar@...ux.vnet.ibm.com, haren@...ux.vnet.ibm.com,
        jglisse@...hat.com, dave.hansen@...el.com,
        dan.j.williams@...el.com, zi.yan@...rutgers.edu
Subject: Re: [PATCH 3/6] mm/migrate: Add copy_pages_mthread function

Hi Zi,

[auto build test WARNING on linus/master]
[also build test WARNING on v4.10-rc8 next-20170216]
[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/Anshuman-Khandual/Enable-parallel-page-migration/20170217-200523
config: i386-tinyconfig (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 >>):

   mm/copy_pages_mthread.c: In function 'copy_pages_mthread':
>> mm/copy_pages_mthread.c:49:10: warning: assignment discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
     cpumask = cpumask_of_node(node);
             ^

vim +/const +49 mm/copy_pages_mthread.c

    33	static void copythread(struct work_struct *work)
    34	{
    35		struct copy_info *info = (struct copy_info *) work;
    36	
    37		copy_pages(info->to, info->from, info->chunk_size);
    38	}
    39	
    40	int copy_pages_mthread(struct page *to, struct page *from, int nr_pages)
    41	{
    42		struct cpumask *cpumask;
    43		struct copy_info *work_items;
    44		char *vto, *vfrom;
    45		unsigned long i, cthreads, cpu, node, chunk_size;
    46		int cpu_id_list[32] = {0};
    47	
    48		node = page_to_nid(to);
  > 49		cpumask = cpumask_of_node(node);
    50		cthreads = nr_copythreads;
    51		cthreads = min_t(unsigned int, cthreads, cpumask_weight(cpumask));
    52		cthreads = (cthreads / 2) * 2;
    53		work_items = kcalloc(cthreads, sizeof(struct copy_info), GFP_KERNEL);
    54		if (!work_items)
    55			return -ENOMEM;
    56	
    57		i = 0;

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

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