Re: [PATCH 2/5] buffer: Calculate block number inside folio_init_buffers()

Re: [PATCH 2/5] buffer: Calculate block number inside folio_init_buffers()

[kernel test robot]

Hi Matthew,

kernel test robot noticed the following build errors:

[auto build test ERROR on akpm-mm/mm-everything]
[also build test ERROR on linus/master next-20231108]
[cannot apply to v6.6]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Matthew-Wilcox-Oracle/buffer-Return-bool-from-grow_dev_folio/20231108-035905
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20231107194152.3374087-3-willy%40infradead.org
patch subject: [PATCH 2/5] buffer: Calculate block number inside folio_init_buffers()
config: i386-randconfig-141-20231108 (https://download.01.org/0day-ci/archive/20231109/202311090123.FRvXagQt-lkp@intel.com/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231109/202311090123.FRvXagQt-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202311090123.FRvXagQt-lkp@intel.com/

All errors (new ones prefixed by >>):

   ld: fs/buffer.o: in function `folio_init_buffers':
>> fs/buffer.c:1003: undefined reference to `__divdi3'


vim +1003 fs/buffer.c

   993	
   994	/*
   995	 * Initialise the state of a blockdev folio's buffers.
   996	 */ 
   997	static sector_t folio_init_buffers(struct folio *folio,
   998			struct block_device *bdev, int size)
   999	{
  1000		struct buffer_head *head = folio_buffers(folio);
  1001		struct buffer_head *bh = head;
  1002		bool uptodate = folio_test_uptodate(folio);
> 1003		sector_t block = folio_pos(folio) / size;
  1004		sector_t end_block = blkdev_max_block(bdev, size);
  1005	
  1006		do {
  1007			if (!buffer_mapped(bh)) {
  1008				bh->b_end_io = NULL;
  1009				bh->b_private = NULL;
  1010				bh->b_bdev = bdev;
  1011				bh->b_blocknr = block;
  1012				if (uptodate)
  1013					set_buffer_uptodate(bh);
  1014				if (block < end_block)
  1015					set_buffer_mapped(bh);
  1016			}
  1017			block++;
  1018			bh = bh->b_this_page;
  1019		} while (bh != head);
  1020	
  1021		/*
  1022		 * Caller needs to validate requested block against end of device.
  1023		 */
  1024		return end_block;
  1025	}
  1026	

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