linux-kernel - Re: [PATCH 1/2] mm: move vma_is_anonymous check within pmd_move_must

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Message-ID: <201611071732.njM40txT%fengguang.wu@intel.com>
Date:   Mon, 7 Nov 2016 17:27:38 +0800
From:   kbuild test robot <lkp@...el.com>
To:     "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:     kbuild-all@...org, akpm@...ux-foundation.org,
        benh@...nel.crashing.org, paulus@...ba.org, mpe@...erman.id.au,
        "Kirill A . Shutemov" <kirill@...temov.name>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Subject: Re: [PATCH 1/2] mm: move vma_is_anonymous check within
 pmd_move_must_withdraw

Hi Aneesh,

[auto build test ERROR on mmotm/master]
[also build test ERROR on v4.9-rc4 next-20161028]
[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/Aneesh-Kumar-K-V/mm-move-vma_is_anonymous-check-within-pmd_move_must_withdraw/20161107-164033
base:   git://git.cmpxchg.org/linux-mmotm.git master
config: i386-randconfig-x006-201645 (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 error/warnings (new ones prefixed by >>):

   mm/huge_memory.c: In function 'pmd_move_must_withdraw':
>> mm/huge_memory.c:1441:58: error: 'vma' undeclared (first use in this function)
     return (new_pmd_ptl != old_pmd_ptl) && vma_is_anonymous(vma);
                                                             ^~~
   mm/huge_memory.c:1441:58: note: each undeclared identifier is reported only once for each function it appears in
>> mm/huge_memory.c:1442:1: warning: control reaches end of non-void function [-Wreturn-type]
    }
    ^

vim +/vma +1441 mm/huge_memory.c

  1435		/*
  1436		 * With split pmd lock we also need to move preallocated
  1437		 * PTE page table if new_pmd is on different PMD page table.
  1438		 *
  1439		 * We also don't deposit and withdraw tables for file pages.
  1440		 */
> 1441		return (new_pmd_ptl != old_pmd_ptl) && vma_is_anonymous(vma);
> 1442	}
  1443	#endif
  1444	
  1445	bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr,

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