[djwong-xfs:timestats-hoist 414/457] fs/iomap/buffered-io.c:402:15: sparse: sparse: Using plain integer as NULL pointer

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux.git timestats-hoist
head:   ed4cedcef505729c94212031f8ed784a5fd81ac5
commit: f0eab2ef375fb100ef4441c0e275fd7cfaac65a0 [414/457] iomap: integrate fs-verity verification into iomap's read path
config: hexagon-randconfig-r113-20240413 (https://download.01.org/0day-ci/archive/20240413/202404132008.NdtiWG9k-lkp@intel.com/config)
compiler: clang version 19.0.0git (https://github.com/llvm/llvm-project 8b3b4a92adee40483c27f26c478a384cd69c6f05)
reproduce: (https://download.01.org/0day-ci/archive/20240413/202404132008.NdtiWG9k-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/202404132008.NdtiWG9k-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> fs/iomap/buffered-io.c:402:15: sparse: sparse: Using plain integer as NULL pointer

vim +402 fs/iomap/buffered-io.c

   380	
   381	static int iomap_fsverity_init_bioset(void)
   382	{
   383		struct bio_set *bs, *old;
   384		int error;
   385	
   386		bs = kzalloc(sizeof(*bs), GFP_KERNEL);
   387		if (!bs)
   388			return -ENOMEM;
   389	
   390		error = bioset_init(bs, IOMAP_POOL_SIZE,
   391				    offsetof(struct iomap_fsverity_bio, bio),
   392				    BIOSET_NEED_BVECS);
   393		if (error) {
   394			kfree(bs);
   395			return error;
   396		}
   397	
   398		/*
   399		 * This has to be atomic as readaheads can race to create the
   400		 * bioset.  If someone set the pointer before us, we drop ours.
   401		 */
 > 402		old = cmpxchg(&iomap_fsverity_bioset, NULL, bs);
   403		if (old) {
   404			bioset_exit(bs);
   405			kfree(bs);
   406		}
   407	
   408		return 0;
   409	}
   410	

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