Re: [PATCH v3 3/3] overflow: Remove is_non_negative() and is_negative()

kernel test robot
2025-12-25T06:04:50Z

Hi Vincent,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 3e7f562e20ee87a25e104ef4fce557d39d62fa85]

url: https://github.com/intel-lab-lkp/linux/commits/Vincent-Mailhol/kbuild-remove-gcc-s-Wtype-limits/20251220-190509
base: 3e7f562e20ee87a25e104ef4fce557d39d62fa85
patch link: https://lore.kernel.org/r/20251220-remove_wtype-limits-v3-3-24b170af700e%40kernel.org
patch subject: [PATCH v3 3/3] overflow: Remove is_non_negative() and is_negative()
config: i386-randconfig-141-20251225 (https://download.01.org/0day-ci/archive/20251225/202512251340.UApIFw9R-lkp@intel.com/config)
compiler: gcc-13 (Debian 13.3.0-16) 13.3.0

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/202512251340.UApIFw9R-lkp@intel.com/

smatch warnings:
drivers/md/dm-stripe.c:463 stripe_io_hints() warn: unsigned '*_d' is never less than zero.
drivers/md/dm-stripe.c:463 stripe_io_hints() warn: unsigned '_a' is never less than zero.

vim +463 drivers/md/dm-stripe.c

af4874e03ed82f Mike Snitzer 2009-06-22 454
40bea431274c24 Mike Snitzer 2009-09-04 455 static void stripe_io_hints(struct dm_target *ti,
40bea431274c24 Mike Snitzer 2009-09-04 456 struct queue_limits *limits)
40bea431274c24 Mike Snitzer 2009-09-04 457 {
40bea431274c24 Mike Snitzer 2009-09-04 458 struct stripe_c *sc = ti->private;
1071d560afb4c2 Mikulas Patocka 2025-08-11 459 unsigned int io_min, io_opt;
40bea431274c24 Mike Snitzer 2009-09-04 460
5fb9d4341b782a John Garry 2025-07-11 461 limits->chunk_sectors = sc->chunk_size;
1071d560afb4c2 Mikulas Patocka 2025-08-11 462
1071d560afb4c2 Mikulas Patocka 2025-08-11 @463 if (!check_shl_overflow(sc->chunk_size, SECTOR_SHIFT, &io_min) &&
1071d560afb4c2 Mikulas Patocka 2025-08-11 464 !check_mul_overflow(io_min, sc->stripes, &io_opt)) {
1071d560afb4c2 Mikulas Patocka 2025-08-11 465 limits->io_min = io_min;
1071d560afb4c2 Mikulas Patocka 2025-08-11 466 limits->io_opt = io_opt;
1071d560afb4c2 Mikulas Patocka 2025-08-11 467 }
40bea431274c24 Mike Snitzer 2009-09-04 468 }
40bea431274c24 Mike Snitzer 2009-09-04 469

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