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

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Date:   Fri, 26 May 2017 01:06:43 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Zi Yan <zi.yan@...t.com>
Cc:     kbuild-all@...org, n-horiguchi@...jp.nec.com,
        kirill.shutemov@...ux.intel.com, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, akpm@...ux-foundation.org, minchan@...nel.org,
        vbabka@...e.cz, mgorman@...hsingularity.net, mhocko@...nel.org,
        khandual@...ux.vnet.ibm.com, zi.yan@...rutgers.edu,
        dnellans@...dia.com, dave.hansen@...el.com
Subject: Re: [PATCH v6 05/10] mm: thp: enable thp migration in generic path

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 }};
                   ^
   include/linux/swapops.h:222:16: note: (near initialization for '(anonymous)')

vim +222 include/linux/swapops.h

   206			struct page *new)
   207	{
   208		BUILD_BUG();
   209	}
   210	
   211	static inline void pmd_migration_entry_wait(struct mm_struct *m, pmd_t *p) { }
   212	
   213	static inline swp_entry_t pmd_to_swp_entry(pmd_t pmd)
   214	{
   215		BUILD_BUG();
   216		return swp_entry(0, 0);
   217	}
   218	
   219	static inline pmd_t swp_entry_to_pmd(swp_entry_t entry)
   220	{
   221		BUILD_BUG();
 > 222		return (pmd_t){{ 0 }};
   223	}
   224	
   225	static inline int is_pmd_migration_entry(pmd_t pmd)
   226	{
   227		return 0;
   228	}
   229	#endif
   230	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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