drivers/clk/bcm/clk-bcm2835.c:952:1-7: WARNING: do_div() does a 64-by-32 division, please consider using div64_ul instead.

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

Hi Thomas,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   6addb4f385570ebc11c4eb499a4f1c149f313e84
commit: 031cdd3bc3f369553933c1b0f4cb18000162c8ff kunit: Enable PCI on UML without triggering WARN()
date:   1 year, 1 month ago
config: um-randconfig-r2104-20261004 (https://download.01.org/0day-ci/archive/20261004/202610041410.n4VXsQjz-lkp@intel.com/config)
compiler: clang version 24.0.0git (https://github.com/llvm/llvm-project d7e4505dd447d115d85fdea45cd71030ac1d86ee)

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
| Fixes: 031cdd3bc3f3 ("kunit: Enable PCI on UML without triggering WARN()")
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202610041410.n4VXsQjz-lkp@intel.com/

cocci warnings: (new ones prefixed by >>)
>> drivers/clk/bcm/clk-bcm2835.c:952:1-7: WARNING: do_div() does a 64-by-32 division, please consider using div64_ul instead.
   drivers/clk/bcm/clk-bcm2835.c:554:1-7: WARNING: do_div() does a 64-by-32 division, please consider using div64_ul instead.
--
>> drivers/phy/rockchip/phy-rockchip-inno-dsidphy.c:327:2-8: WARNING: do_div() does a 64-by-32 division, please consider using div64_ul instead.
--
>> drivers/watchdog/rti_wdt.c:187:1-7: WARNING: do_div() does a 64-by-32 division, please consider using div64_ul instead.
   drivers/watchdog/rti_wdt.c:279:2-8: WARNING: do_div() does a 64-by-32 division, please consider using div64_ul instead.
--
>> drivers/gpu/drm/tegra/output.c:167:8-28: WARNING: Threaded IRQ with no primary handler requested without IRQF_ONESHOT (unless it is nested IRQ)
--
>> drivers/gpu/drm/kmb/kmb_drv.c:520:2-8: ERROR: missing put_device; call of_find_device_by_node on line 507, but without a corresponding object release within this function.
   drivers/gpu/drm/kmb/kmb_drv.c:523:2-8: ERROR: missing put_device; call of_find_device_by_node on line 507, but without a corresponding object release within this function.
   drivers/gpu/drm/kmb/kmb_drv.c:530:2-8: ERROR: missing put_device; call of_find_device_by_node on line 507, but without a corresponding object release within this function.
   drivers/gpu/drm/kmb/kmb_drv.c:580:1-7: ERROR: missing put_device; call of_find_device_by_node on line 507, but without a corresponding object release within this function.
--
>> drivers/gpu/drm/panthor/panthor_heap.c:404:28-33: ERROR: invalid reference to the index variable of the iterator on line 392

vim +952 drivers/clk/bcm/clk-bcm2835.c

41691b8862e2a3 Eric Anholt   2015-10-08  940  
41691b8862e2a3 Eric Anholt   2015-10-08  941  static u32 bcm2835_clock_choose_div(struct clk_hw *hw,
41691b8862e2a3 Eric Anholt   2015-10-08  942  				    unsigned long rate,
8ca011ef4af48a Maxime Ripard 2021-09-22  943  				    unsigned long parent_rate)
41691b8862e2a3 Eric Anholt   2015-10-08  944  {
41691b8862e2a3 Eric Anholt   2015-10-08  945  	struct bcm2835_clock *clock = bcm2835_clock_from_hw(hw);
41691b8862e2a3 Eric Anholt   2015-10-08  946  	const struct bcm2835_clock_data *data = clock->data;
9c95b32ca09364 Remi Pommarel 2015-12-06  947  	u32 unused_frac_mask =
9c95b32ca09364 Remi Pommarel 2015-12-06  948  		GENMASK(CM_DIV_FRAC_BITS - data->frac_bits, 0) >> 1;
41691b8862e2a3 Eric Anholt   2015-10-08  949  	u64 temp = (u64)parent_rate << CM_DIV_FRAC_BITS;
959ca92a3235fc Martin Sperl  2016-02-29  950  	u32 div, mindiv, maxdiv;
41691b8862e2a3 Eric Anholt   2015-10-08  951  
88110a9f6209be Stefan Wahren 2022-04-28 @952  	do_div(temp, rate);
41691b8862e2a3 Eric Anholt   2015-10-08  953  	div = temp;
41691b8862e2a3 Eric Anholt   2015-10-08  954  	div &= ~unused_frac_mask;
41691b8862e2a3 Eric Anholt   2015-10-08  955  
959ca92a3235fc Martin Sperl  2016-02-29  956  	/* different clamping limits apply for a mash clock */
959ca92a3235fc Martin Sperl  2016-02-29  957  	if (data->is_mash_clock) {
959ca92a3235fc Martin Sperl  2016-02-29  958  		/* clamp to min divider of 2 */
959ca92a3235fc Martin Sperl  2016-02-29  959  		mindiv = 2 << CM_DIV_FRAC_BITS;
959ca92a3235fc Martin Sperl  2016-02-29  960  		/* clamp to the highest possible integer divider */
959ca92a3235fc Martin Sperl  2016-02-29  961  		maxdiv = (BIT(data->int_bits) - 1) << CM_DIV_FRAC_BITS;
959ca92a3235fc Martin Sperl  2016-02-29  962  	} else {
997f16bd5d2e9b Martin Sperl  2016-02-29  963  		/* clamp to min divider of 1 */
959ca92a3235fc Martin Sperl  2016-02-29  964  		mindiv = 1 << CM_DIV_FRAC_BITS;
997f16bd5d2e9b Martin Sperl  2016-02-29  965  		/* clamp to the highest possible fractional divider */
959ca92a3235fc Martin Sperl  2016-02-29  966  		maxdiv = GENMASK(data->int_bits + CM_DIV_FRAC_BITS - 1,
959ca92a3235fc Martin Sperl  2016-02-29  967  				 CM_DIV_FRAC_BITS - data->frac_bits);
959ca92a3235fc Martin Sperl  2016-02-29  968  	}
959ca92a3235fc Martin Sperl  2016-02-29  969  
959ca92a3235fc Martin Sperl  2016-02-29  970  	/* apply the clamping  limits */
959ca92a3235fc Martin Sperl  2016-02-29  971  	div = max_t(u32, div, mindiv);
959ca92a3235fc Martin Sperl  2016-02-29  972  	div = min_t(u32, div, maxdiv);
41691b8862e2a3 Eric Anholt   2015-10-08  973  
41691b8862e2a3 Eric Anholt   2015-10-08  974  	return div;
41691b8862e2a3 Eric Anholt   2015-10-08  975  }
41691b8862e2a3 Eric Anholt   2015-10-08  976  

:::::: The code at line 952 was first introduced by commit
:::::: 88110a9f6209be1ed7312bae029d000bc7c7e88f clk: bcm2835: fix bcm2835_clock_choose_div

:::::: TO: Stefan Wahren <stefan.wahren@i2se.com>
:::::: CC: Stephen Boyd <sboyd@kernel.org>

--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki