linux-kernel - Re: [PATCH v6 05/10] mm: thp: enable thp migration in generic path

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Date:   Thu, 25 May 2017 15:43:28 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     "Zi Yan" <zi.yan@...rutgers.edu>
Cc:     "kbuild test robot" <lkp@...el.com>, kbuild-all@...org,
        n-horiguchi@...jp.nec.com, kirill.shutemov@...ux.intel.com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        minchan@...nel.org, vbabka@...e.cz, mgorman@...hsingularity.net,
        mhocko@...nel.org, khandual@...ux.vnet.ibm.com,
        dnellans@...dia.com, dave.hansen@...el.com
Subject: Re: [PATCH v6 05/10] mm: thp: enable thp migration in generic path

On Thu, 25 May 2017 13:19:54 -0400 "Zi Yan" <zi.yan@...rutgers.edu> wrote:

> On 25 May 2017, at 13:06, kbuild test robot wrote:
> 
> > Hi Zi,
> >
> > [auto build test WARNING on mmotm/master]
> > [also build test WARNING on v4.12-rc2 next-20170525]
> > [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/Zi-Yan/mm-page-migration-enhancement-for-thp/20170526-003749
> > base:   git://git.cmpxchg.org/linux-mmotm.git master
> > config: i386-randconfig-x016-201721 (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 fs/proc/task_mmu.c:15:0:
> >    include/linux/swapops.h: In function 'swp_entry_to_pmd':
> >>> include/linux/swapops.h:222:16: warning: missing braces around initializer [-Wmissing-braces]
> >      return (pmd_t){{ 0 }};
> >                    ^
> 
> The braces are added to eliminate the warning from "m68k-linux-gcc (GCC) 4.9.0",
> which has the bug: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53119.

I think we'd prefer to have a warning on m68k than on i386!  Is there
something smarter we can do here?