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

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Date:   Wed, 8 Mar 2017 21:10:38 +0530
From:   Anshuman Khandual <khandual@...ux.vnet.ibm.com>
To:     kbuild test robot <lkp@...el.com>,
        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

On 02/17/2017 05:57 PM, kbuild test robot wrote:
> 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);

My bad. This fixes the above warning. Will fix it up next time
around.

diff --git a/mm/copy_pages_mthread.c b/mm/copy_pages_mthread.c
index 9ad2ef6..46b22b1 100644
--- a/mm/copy_pages_mthread.c
+++ b/mm/copy_pages_mthread.c
@@ -46,7 +46,7 @@ int copy_pages_mthread(struct page *to, struct page
*from, int nr_pages)
        int cpu_id_list[32] = {0};

        node = page_to_nid(to);
-       cpumask = cpumask_of_node(node);
+       cpumask = (struct cpumask *) cpumask_of_node(node);
        cthreads = nr_copythreads;
        cthreads = min_t(unsigned int, cthreads, cpumask_weight(cpumask));
        cthreads = (cthreads / 2) * 2;