[android-common:android15-6.6-2025-05 0/5] include/linux/blk-mq.h:865:31: sparse: sparse: unsigned value that used to be signed checked against zero?

[kernel test robot <lkp@intel.com>]

:::::: 
:::::: Manual check reason: "low confidence static check warning: include/linux/blk-mq.h:865:31: sparse: sparse: unsigned value that used to be signed checked against zero?"
:::::: 

BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
TO: cros-kernel-buildreports@googlegroups.com

tree:   https://android.googlesource.com/kernel/common android15-6.6-2025-05
head:   69e9e5ccddbc3e3bc5614ab8465b6fcd8fafd443
commit: 99ca540851ee906ae15d36566ed3447e6e415780 [0/5] block: cleanup and fix batch completion adding conditions
:::::: branch date: 5 days ago
:::::: commit date: 1 year, 3 months ago
config: i386-randconfig-062-20260516 (https://download.01.org/0day-ci/archive/20260516/202605161755.Z2bS6Oi4-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260516/202605161755.Z2bS6Oi4-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/r/202605161755.Z2bS6Oi4-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   drivers/block/null_blk/main.c: note: in included file (through drivers/block/null_blk/null_blk.h):
>> include/linux/blk-mq.h:865:31: sparse: sparse: unsigned value that used to be signed checked against zero?
   drivers/block/null_blk/main.c:1677:46: sparse: signed value source

vim +865 include/linux/blk-mq.h

99e48cd6855e953 John Garry 2022-07-06  842  
f794f3351f2672d Jens Axboe 2021-10-08  843  /*
f794f3351f2672d Jens Axboe 2021-10-08  844   * Batched completions only work when there is no I/O error and no special
f794f3351f2672d Jens Axboe 2021-10-08  845   * ->end_io handler.
f794f3351f2672d Jens Axboe 2021-10-08  846   */
f794f3351f2672d Jens Axboe 2021-10-08  847  static inline bool blk_mq_add_to_batch(struct request *req,
f794f3351f2672d Jens Axboe 2021-10-08  848  				       struct io_comp_batch *iob, int ioerror,
f794f3351f2672d Jens Axboe 2021-10-08  849  				       void (*complete)(struct io_comp_batch *))
f794f3351f2672d Jens Axboe 2021-10-08  850  {
c6b7a3a26e809c9 Ming Lei   2023-06-24  851  	/*
99ca540851ee906 Jens Axboe 2025-02-13  852  	 * Check various conditions that exclude batch processing:
99ca540851ee906 Jens Axboe 2025-02-13  853  	 * 1) No batch container
99ca540851ee906 Jens Axboe 2025-02-13  854  	 * 2) Has scheduler data attached
99ca540851ee906 Jens Axboe 2025-02-13  855  	 * 3) Not a passthrough request and end_io set
99ca540851ee906 Jens Axboe 2025-02-13  856  	 * 4) Not a passthrough request and an ioerror
c6b7a3a26e809c9 Ming Lei   2023-06-24  857  	 */
99ca540851ee906 Jens Axboe 2025-02-13  858  	if (!iob)
f794f3351f2672d Jens Axboe 2021-10-08  859  		return false;
99ca540851ee906 Jens Axboe 2025-02-13  860  	if (req->rq_flags & RQF_SCHED_TAGS)
99ca540851ee906 Jens Axboe 2025-02-13  861  		return false;
99ca540851ee906 Jens Axboe 2025-02-13  862  	if (!blk_rq_is_passthrough(req)) {
99ca540851ee906 Jens Axboe 2025-02-13  863  		if (req->end_io)
99ca540851ee906 Jens Axboe 2025-02-13  864  			return false;
99ca540851ee906 Jens Axboe 2025-02-13 @865  		if (ioerror < 0)
99ca540851ee906 Jens Axboe 2025-02-13  866  			return false;
99ca540851ee906 Jens Axboe 2025-02-13  867  	}
ab3e1d3bbab9e97 Jens Axboe 2022-09-21  868  
f794f3351f2672d Jens Axboe 2021-10-08  869  	if (!iob->complete)
f794f3351f2672d Jens Axboe 2021-10-08  870  		iob->complete = complete;
f794f3351f2672d Jens Axboe 2021-10-08  871  	else if (iob->complete != complete)
f794f3351f2672d Jens Axboe 2021-10-08  872  		return false;
f794f3351f2672d Jens Axboe 2021-10-08  873  	iob->need_ts |= blk_mq_need_time_stamp(req);
f794f3351f2672d Jens Axboe 2021-10-08  874  	rq_list_add(&iob->req_list, req);
f794f3351f2672d Jens Axboe 2021-10-08  875  	return true;
f794f3351f2672d Jens Axboe 2021-10-08  876  }
320ae51feed5c2f Jens Axboe 2013-10-24  877  

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