[openeuler:openEuler-1.0-LTS 1402/1402] block/blk-merge.c:688:16: warning: no previous prototype for 'blk_try_req_merge'

[openeuler:openEuler-1.0-LTS 1402/1402] block/blk-merge.c:688:16: warning: no previous prototype for 'blk_try_req_merge'

[kernel test robot]

tree:   https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS
head:   97f98c391a1fd153ae010a2faf73f9e03270da6e
commit: 5f100bc6aabbe30e55cf20af8e163bb6dba3a3aa [1402/1402] block: fix the DISCARD request merge
config: x86_64-buildonly-randconfig-006-20250109 (https://download.01.org/0day-ci/archive/20250109/202501092100.YDIEEEHw-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250109/202501092100.YDIEEEHw-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/202501092100.YDIEEEHw-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> block/blk-merge.c:688:16: warning: no previous prototype for 'blk_try_req_merge' [-Wmissing-prototypes]
     688 | enum elv_merge blk_try_req_merge(struct request *req, struct request *next)
         |                ^~~~~~~~~~~~~~~~~


vim +/blk_try_req_merge +688 block/blk-merge.c

   687	
 > 688	enum elv_merge blk_try_req_merge(struct request *req, struct request *next)
   689	{
   690		if (blk_discard_mergable(req))
   691			return ELEVATOR_DISCARD_MERGE;
   692		else if (blk_rq_pos(req) + blk_rq_sectors(req) == blk_rq_pos(next))
   693			return ELEVATOR_BACK_MERGE;
   694	
   695		return ELEVATOR_NO_MERGE;
   696	}
   697	

-- 
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https://github.com/intel/lkp-tests/wiki