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From: Geert Uytterhoeven <geert@linux-m68k.org>
Date: Wed, 15 Mar 2017 10:01:08 +0100
Message-ID: <CAMuHMdXQqdZpvtv9un8AoNu-9D5Aq+ZdoPjTrCqka1afi5RQsA@mail.gmail.com>
Subject: Re: [PATCH v4 05/11] mm: thp: enable thp migration in generic path
To: Zi Yan <zi.yan@cs.rutgers.edu>
Cc: kbuild test robot <lkp@intel.com>,
        "kbuild-all@01.org" <kbuild-all@01.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Linux MM <linux-mm@kvack.org>,
        "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Minchan Kim <minchan@kernel.org>, Vlastimil Babka <vbabka@suse.cz>,
        Mel Gorman <mgorman@techsingularity.net>,
        Michal Hocko <mhocko@kernel.org>,
        Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
        Anshuman Khandual <khandual@linux.vnet.ibm.com>, dnellans@nvidia.com
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On Tue, Mar 14, 2017 at 10:55 PM, Zi Yan <zi.yan@cs.rutgers.edu> wrote:
>>>> include/linux/swapops.h:223:2: warning: missing braces around initializer [-Wmissing-braces]
>>      return (pmd_t){ 0 };
>>      ^
>>    include/linux/swapops.h:223:2: warning: (near initialization for '(anonymous).pmd') [-Wmissing-braces]
>
> I do not have any warning with gcc 6.3.0. This seems to be a GCC bug
> (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53119).

I guess you need

    return (pmd_t) { { 0, }};

to kill the warning.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds