Hi Chao,

[FYI, it's a private test report for your RFC patch.]
[auto build test ERROR on f2fs/dev-test]
[also build test ERROR on v5.14-rc4 next-20210803]
[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/0day-ci/linux/commits/Chao-Yu/f2fs-extent-cache-support-unaligned-extent/20210804-102614
base:   https://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs.git dev-test
config: i386-randconfig-a015-20210804 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/5c974bb7b3024da2ab740ed59459e96ef4b52d5c
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Chao-Yu/f2fs-extent-cache-support-unaligned-extent/20210804-102614
        git checkout 5c974bb7b3024da2ab740ed59459e96ef4b52d5c
        # save the attached .config to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash fs/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   In file included from fs/f2fs/dir.c:13:
   fs/f2fs/f2fs.h: In function '__is_extent_mergeable':
>> fs/f2fs/f2fs.h:842:9: error: dereferencing pointer to incomplete type 'struct extent_info_unaligned'
     842 |   if (be->ei.len != be->plen || fe->ei.len != fe->plen)
         |         ^~
--
   In file included from fs/f2fs/extent_cache.c:14:
   fs/f2fs/f2fs.h: In function '__is_extent_mergeable':
>> fs/f2fs/f2fs.h:842:9: error: dereferencing pointer to incomplete type 'struct extent_info_unaligned'
     842 |   if (be->ei.len != be->plen || fe->ei.len != fe->plen)
         |         ^~
   fs/f2fs/extent_cache.c: In function '__attach_extent_node':
   fs/f2fs/extent_cache.c:251:5: error: 'struct extent_node' has no member named 'plen'
     251 |   en->plen = ((struct extent_info_unaligned *)ei)->plen;
         |     ^~
>> fs/f2fs/extent_cache.c:251:50: error: dereferencing pointer to incomplete type 'struct extent_info_unaligned'
     251 |   en->plen = ((struct extent_info_unaligned *)ei)->plen;
         |                                                  ^~


vim +842 fs/f2fs/f2fs.h

   832	
   833	static inline bool __is_extent_mergeable(struct extent_info *back,
   834					struct extent_info *front, bool unaligned)
   835	{
   836		if (unaligned) {
   837			struct extent_info_unaligned *be =
   838					(struct extent_info_unaligned *)back;
   839			struct extent_info_unaligned *fe =
   840					(struct extent_info_unaligned *)front;
   841	
 > 842			if (be->ei.len != be->plen || fe->ei.len != fe->plen)
   843				return false;
   844		}
   845	
   846		return (back->fofs + back->len == front->fofs &&
   847				back->blk + back->len == front->blk);
   848	}
   849	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org