[xfs:xfs-4.7-writeback-bio 2/3] fs/xfs/xfs_aops.c:97:16: warning: unused variable 'blockmask'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/dgc/linux-xfs.git xfs-4.7-writeback-bio
head:   0e51a8e191dbd9b9c7b7bb0a1c28d57cd2be8e6a
commit: 37992c18bba3f578860c6448b7bae18a14e535d3 [2/3] xfs: don't release bios on completion immediately
config: i386-randconfig-x013-201614 (attached as .config)
reproduce:
        git checkout 37992c18bba3f578860c6448b7bae18a14e535d3
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   fs/xfs/xfs_aops.c: In function 'xfs_finish_page_writeback':
>> fs/xfs/xfs_aops.c:97:16: warning: unused variable 'blockmask' [-Wunused-variable]
     unsigned int  blockmask = (1 << inode->i_blkbits) - 1;
                   ^

vim +/blockmask +97 fs/xfs/xfs_aops.c

    81			return mp->m_rtdev_targp->bt_bdev;
    82		else
    83			return mp->m_ddev_targp->bt_bdev;
    84	}
    85	
    86	/*
    87	 * We're now finished for good with this page.  Update the page state via the
    88	 * associated buffer_heads, paying attention to the start and end offsets that
    89	 * we need to process on the page.
    90	 */
    91	static void
    92	xfs_finish_page_writeback(
    93		struct inode		*inode,
    94		struct bio_vec		*bvec,
    95		int			error)
    96	{
  > 97		unsigned int		blockmask = (1 << inode->i_blkbits) - 1;
    98		unsigned int		end = bvec->bv_offset + bvec->bv_len - 1;
    99		struct buffer_head	*head, *bh;
   100		unsigned int		off = 0;
   101	
   102		ASSERT(bvec->bv_offset < PAGE_SIZE);
   103		ASSERT((bvec->bv_offset & blockmask) == 0);
   104		ASSERT(end < PAGE_SIZE);
   105		ASSERT((bvec->bv_len & blockmask) == 0);

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