linux-kernel - Re: [PATCH v4 05/11] mm: thp: enable thp migration in generic path

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Date:   Tue, 14 Mar 2017 16:55:02 -0500
From:   Zi Yan <zi.yan@...rutgers.edu>
To:     kbuild test robot <lkp@...el.com>
CC:     <kbuild-all@...org>, <linux-kernel@...r.kernel.org>,
        <linux-mm@...ck.org>, <kirill.shutemov@...ux.intel.com>,
        <akpm@...ux-foundation.org>, <minchan@...nel.org>,
        <vbabka@...e.cz>, <mgorman@...hsingularity.net>,
        <mhocko@...nel.org>, <n-horiguchi@...jp.nec.com>,
        <khandual@...ux.vnet.ibm.com>, <dnellans@...dia.com>
Subject: Re: [PATCH v4 05/11] mm: thp: enable thp migration in generic path



On 03/14/2017 04:19 PM, kbuild test robot wrote:
> Hi Naoya,
>
> [auto build test WARNING on mmotm/master]
> [also build test WARNING on next-20170310]
> [cannot apply to v4.11-rc2]
> [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/20170315-042736
> base:   git://git.cmpxchg.org/linux-mmotm.git master
> config: m68k-sun3_defconfig (attached as .config)
> compiler: m68k-linux-gcc (GCC) 4.9.0
> reproduce:
>         wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # save the attached .config to linux build tree
>         make.cross ARCH=m68k 
>
> All warnings (new ones prefixed by >>):
>
>    In file included from fs/proc/task_mmu.c:15:0:
>    include/linux/swapops.h: In function 'remove_migration_pmd':
>    include/linux/swapops.h:209:2: warning: 'return' with a value, in function returning void
>      return 0;
>      ^
>    include/linux/swapops.h: In function 'swp_entry_to_pmd':

I will remove "return 0;" in next version.

--- a/include/linux/swapops.h
+++ b/include/linux/swapops.h
@@ -208,7 +208,6 @@ static inline void remove_migration_pmd(struct
page_vma_mapped_walk *pvmw,
                struct page *new)
 {
        BUILD_BUG();
-       return 0;
 }

 static inline void pmd_migration_entry_wait(struct mm_struct *m, pmd_t
*p) { }


>>> 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).


-- 
Best Regards,
Yan Zi



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