linux-kernel - [peterz-queue:x86/mm.pae 5/9] mm/khugepaged.c:865:16: error: implicit declaration of function 'pmd_read

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Message-ID: <202210132122.DnShsQeP-lkp@intel.com>
Date:   Thu, 13 Oct 2022 21:49:03 +0800
From:   kernel test robot <lkp@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [peterz-queue:x86/mm.pae 5/9] mm/khugepaged.c:865:16: error:
 implicit declaration of function 'pmd_read_atomic'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git x86/mm.pae
head:   ce0487547e80c85cd1deec9bce726a58110457fe
commit: 833e9fc96f63a8e37d78baad15362b5ad8baac3c [5/9] mm: Rename pmd_read_atomic()
config: x86_64-randconfig-a013
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/commit/?id=833e9fc96f63a8e37d78baad15362b5ad8baac3c
        git remote add peterz-queue https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git
        git fetch --no-tags peterz-queue x86/mm.pae
        git checkout 833e9fc96f63a8e37d78baad15362b5ad8baac3c
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

   mm/khugepaged.c: In function 'find_pmd_or_thp_or_none':
>> mm/khugepaged.c:865:16: error: implicit declaration of function 'pmd_read_atomic' [-Werror=implicit-function-declaration]
     865 |         pmde = pmd_read_atomic(*pmd);
         |                ^~~~~~~~~~~~~~~
>> mm/khugepaged.c:865:16: error: incompatible types when assigning to type 'pmd_t' from type 'int'
   cc1: some warnings being treated as errors


vim +/pmd_read_atomic +865 mm/khugepaged.c

b46e756f5e47031 Kirill A. Shutemov 2016-07-26  854  
507228044236804 Zach O'Keefe       2022-07-06  855  static int find_pmd_or_thp_or_none(struct mm_struct *mm,
507228044236804 Zach O'Keefe       2022-07-06  856  				   unsigned long address,
507228044236804 Zach O'Keefe       2022-07-06  857  				   pmd_t **pmd)
507228044236804 Zach O'Keefe       2022-07-06  858  {
507228044236804 Zach O'Keefe       2022-07-06  859  	pmd_t pmde;
507228044236804 Zach O'Keefe       2022-07-06  860  
507228044236804 Zach O'Keefe       2022-07-06  861  	*pmd = mm_find_pmd(mm, address);
507228044236804 Zach O'Keefe       2022-07-06  862  	if (!*pmd)
507228044236804 Zach O'Keefe       2022-07-06  863  		return SCAN_PMD_NULL;
507228044236804 Zach O'Keefe       2022-07-06  864  
507228044236804 Zach O'Keefe       2022-07-06 @865  	pmde = pmd_read_atomic(*pmd);
507228044236804 Zach O'Keefe       2022-07-06  866  

:::::: The code at line 865 was first introduced by commit
:::::: 50722804423680488b8063f6cc9a451333bf6f9b mm/khugepaged: record SCAN_PMD_MAPPED when scan_pmd() finds hugepage

:::::: TO: Zach O'Keefe <zokeefe@...gle.com>
:::::: CC: Andrew Morton <akpm@...ux-foundation.org>

-- 
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https://01.org/lkp

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