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

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Date:   Wed, 15 Mar 2017 05:19:18 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Zi Yan <zi.yan@...t.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,
        zi.yan@...rutgers.edu, dnellans@...dia.com
Subject: Re: [PATCH v4 05/11] mm: thp: enable thp migration in generic path

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':
>> 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]

vim +223 include/linux/swapops.h

   203	}
   204	
   205	static inline void remove_migration_pmd(struct page_vma_mapped_walk *pvmw,
   206			struct page *new)
   207	{
   208		BUILD_BUG();
 > 209		return 0;
   210	}
   211	
   212	static inline void pmd_migration_entry_wait(struct mm_struct *m, pmd_t *p) { }
   213	
   214	static inline swp_entry_t pmd_to_swp_entry(pmd_t pmd)
   215	{
   216		BUILD_BUG();
   217		return swp_entry(0, 0);
   218	}
   219	
   220	static inline pmd_t swp_entry_to_pmd(swp_entry_t entry)
   221	{
   222		BUILD_BUG();
 > 223		return (pmd_t){ 0 };
   224	}
   225	
   226	static inline int is_pmd_migration_entry(pmd_t pmd)

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0-DAY kernel test infrastructure                Open Source Technology Center
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