linux-ext4 - Re: [PATCH 04/20] mm/migrate: Convert buffer_migrate_page() to buffer_migrate

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Date:   Tue, 7 Jun 2022 16:01:02 +0800
From:   kernel test robot <lkp@...el.com>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-fsdevel@...r.kernel.org
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-aio@...ck.org, linux-btrfs@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
        cluster-devel@...hat.com, linux-mm@...ck.org,
        linux-xfs@...r.kernel.org, linux-nfs@...r.kernel.org,
        linux-ntfs-dev@...ts.sourceforge.net, ocfs2-devel@....oracle.com,
        linux-mtd@...ts.infradead.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH 04/20] mm/migrate: Convert buffer_migrate_page() to
 buffer_migrate_folio()

Hi "Matthew,

I love your patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v5.19-rc1 next-20220607]
[cannot apply to jaegeuk-f2fs/dev-test trondmy-nfs/linux-next kdave/for-next xfs-linux/for-next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/intel-lab-lkp/linux/commits/Matthew-Wilcox-Oracle/Convert-aops-migratepage-to-aops-migrate_folio/20220607-044509
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git f2906aa863381afb0015a9eb7fefad885d4e5a56
config: s390-randconfig-c005-20220606 (https://download.01.org/0day-ci/archive/20220607/202206071552.6lOdScLW-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project b92436efcb7813fc481b30f2593a4907568d917a)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install s390 cross compiling tool for clang build
        # apt-get install binutils-s390x-linux-gnu
        # https://github.com/intel-lab-lkp/linux/commit/96e64ba8b1be545885d89f44b1d8b968b22bdb4d
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Matthew-Wilcox-Oracle/Convert-aops-migratepage-to-aops-migrate_folio/20220607-044509
        git checkout 96e64ba8b1be545885d89f44b1d8b968b22bdb4d
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash

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

All warnings (new ones prefixed by >>):

>> mm/migrate.c:775: warning: expecting prototype for buffer_migrate_folio_noref(). Prototype was for buffer_migrate_folio_norefs() instead


vim +775 mm/migrate.c

89cb0888ca1483 Jan Kara                2018-12-28  758  
96e64ba8b1be54 Matthew Wilcox (Oracle  2022-06-06  759) /**
96e64ba8b1be54 Matthew Wilcox (Oracle  2022-06-06  760)  * buffer_migrate_folio_noref() - Migration function for folios with buffers.
96e64ba8b1be54 Matthew Wilcox (Oracle  2022-06-06  761)  * @mapping: The address space containing @src.
96e64ba8b1be54 Matthew Wilcox (Oracle  2022-06-06  762)  * @dst: The folio to migrate to.
96e64ba8b1be54 Matthew Wilcox (Oracle  2022-06-06  763)  * @src: The folio to migrate from.
96e64ba8b1be54 Matthew Wilcox (Oracle  2022-06-06  764)  * @mode: How to migrate the folio.
96e64ba8b1be54 Matthew Wilcox (Oracle  2022-06-06  765)  *
96e64ba8b1be54 Matthew Wilcox (Oracle  2022-06-06  766)  * Like buffer_migrate_folio() except that this variant is more careful
96e64ba8b1be54 Matthew Wilcox (Oracle  2022-06-06  767)  * and checks that there are also no buffer head references. This function
96e64ba8b1be54 Matthew Wilcox (Oracle  2022-06-06  768)  * is the right one for mappings where buffer heads are directly looked
96e64ba8b1be54 Matthew Wilcox (Oracle  2022-06-06  769)  * up and referenced (such as block device mappings).
96e64ba8b1be54 Matthew Wilcox (Oracle  2022-06-06  770)  *
96e64ba8b1be54 Matthew Wilcox (Oracle  2022-06-06  771)  * Return: 0 on success or a negative errno on failure.
89cb0888ca1483 Jan Kara                2018-12-28  772   */
96e64ba8b1be54 Matthew Wilcox (Oracle  2022-06-06  773) int buffer_migrate_folio_norefs(struct address_space *mapping,
96e64ba8b1be54 Matthew Wilcox (Oracle  2022-06-06  774) 		struct folio *dst, struct folio *src, enum migrate_mode mode)
89cb0888ca1483 Jan Kara                2018-12-28 @775  {
96e64ba8b1be54 Matthew Wilcox (Oracle  2022-06-06  776) 	return __buffer_migrate_folio(mapping, dst, src, mode, true);
89cb0888ca1483 Jan Kara                2018-12-28  777  }
9361401eb7619c David Howells           2006-09-30  778  #endif
1d8b85ccf1ed53 Christoph Lameter       2006-06-23  779  

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