Re: [PATCH] NULL pointer in raid1_make_request passed to bio_trim when adding md as bcache caching dev

Hi Eric,

[auto build test ERROR on linus/master]
[also build test ERROR on v4.8-rc1 next-20160811]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Eric-Wheeler/NULL-pointer-in-raid1_make_request-passed-to-bio_trim-when-adding-md-as-bcache-caching-dev/20160811-115046
config: i386-randconfig-s0-201632 (attached as .config)
compiler: gcc-6 (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

Note: the linux-review/Eric-Wheeler/NULL-pointer-in-raid1_make_request-passed-to-bio_trim-when-adding-md-as-bcache-caching-dev/20160811-115046 HEAD 84e331216ae8d3359dd0e7bf2cf4e11e30ca73e5 builds fine.
      It only hurts bisectibility.

All errors (new ones prefixed by >>):

   In file included from fs/btrfs/super.c:19:0:

quoted

include/linux/blkdev.h:1179:24: error: 'BIO_MAX_SECTORS' undeclared here (not in a function)

     BLK_DEF_MAX_SECTORS = BIO_MAX_SECTORS,
                           ^~~~~~~~~~~~~~~

vim +/BIO_MAX_SECTORS +1179 include/linux/blkdev.h

  1173		BLK_MAX_SEGMENTS	= 128,
  1174		BLK_SAFE_MAX_SECTORS	= 255,
  1175		/*
  1176		 * if you change this, please also change bvec_alloc and BIO_MAX_PAGES.
  1177		 * Otherwise bio_alloc_bioset will break.
  1178		 */

1179		BLK_DEF_MAX_SECTORS	= BIO_MAX_SECTORS,

  1180		BLK_MAX_SEGMENT_SIZE	= 65536,
  1181		BLK_SEG_BOUNDARY_MASK	= 0xFFFFFFFFUL,
  1182	};

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