linux-kernel - Re: [PATCH] mm/thp/migration: switch from flush_tlb_range to flush_pmd_tlb

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Date:	Wed, 10 Feb 2016 14:10:22 +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,
	Mel Gorman <mgorman@...hsingularity.net>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Vineet Gupta <Vineet.Gupta1@...opsys.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Subject: Re: [PATCH] mm/thp/migration: switch from flush_tlb_range to
 flush_pmd_tlb_range

Hi Aneesh,

[auto build test ERROR on v4.5-rc3]
[also build test ERROR on next-20160209]
[cannot apply to arc/for-next]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Aneesh-Kumar-K-V/mm-thp-migration-switch-from-flush_tlb_range-to-flush_pmd_tlb_range/20160210-135701
config: x86_64-randconfig-x012-201606 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   mm/migrate.c: In function 'migrate_misplaced_transhuge_page':
>> mm/migrate.c:1833:3: error: implicit declaration of function 'flush_pmd_tlb_range' [-Werror=implicit-function-declaration]
      flush_pmd_tlb_range(vma, mmun_start, mmun_end);
      ^
   cc1: some warnings being treated as errors

vim +/flush_pmd_tlb_range +1833 mm/migrate.c

  1827		pmdp_huge_clear_flush_notify(vma, mmun_start, pmd);
  1828		set_pmd_at(mm, mmun_start, pmd, entry);
  1829		update_mmu_cache_pmd(vma, address, &entry);
  1830	
  1831		if (page_count(page) != 2) {
  1832			set_pmd_at(mm, mmun_start, pmd, orig_entry);
> 1833			flush_pmd_tlb_range(vma, mmun_start, mmun_end);
  1834			mmu_notifier_invalidate_range(mm, mmun_start, mmun_end);
  1835			update_mmu_cache_pmd(vma, address, &entry);
  1836			page_remove_rmap(new_page, true);

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