[jfern:nova-core-experiments 154/411] drivers/gpu/drm/nouveau/nvif/dispchan.c:93:9: sparse: sparse: cast removes address space '__iomem' of expression

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jfern/linux.git nova-core-experiments
head:   3b93174b3502247b0c46bd54a7cf5f4105274edb
commit: b31c153a3d075fcae5f7fd482a74b060f5365081 [154/411] drm/nouveau/nvif: rework disp "new chan" apis
config: s390-randconfig-r133-20250308 (https://download.01.org/0day-ci/archive/20250308/202503081649.TxBe0OC5-lkp@intel.com/config)
compiler: clang version 15.0.7 (https://github.com/llvm/llvm-project 8dfdcc7b7bf66834a761bd8de445840ef68e4d1a)
reproduce: (https://download.01.org/0day-ci/archive/20250308/202503081649.TxBe0OC5-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/202503081649.TxBe0OC5-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   drivers/gpu/drm/nouveau/nvif/dispchan.c:36:34: sparse: sparse: subtraction of different types can't work (different address spaces)
>> drivers/gpu/drm/nouveau/nvif/dispchan.c:93:9: sparse: sparse: cast removes address space '__iomem' of expression
   drivers/gpu/drm/nouveau/nvif/dispchan.c:107:34: sparse: sparse: subtraction of different types can't work (different address spaces)
   drivers/gpu/drm/nouveau/nvif/dispchan.c:189:24: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected unsigned int [usertype] *bgn @@     got void [noderef] __iomem *ptr @@

vim +/__iomem +93 drivers/gpu/drm/nouveau/nvif/dispchan.c

    71	
    72	static int
    73	nvif_dispchan_wind(struct nvif_dispchan *chan)
    74	{
    75		struct nvif_push *push = &chan->push;
    76	
    77		/* Wait for GET to depart from the beginning of the push buffer to
    78		 * prevent writing PUT == GET, which would be ignored by HW.
    79		 */
    80		u32 get = NVIF_RV32(chan, NV507C, GET, PTR);
    81		if (get == 0) {
    82			/* Corner-case, HW idle, but non-committed work pending. */
    83			if (push->hw.put == 0)
    84				nvif_dispchan_kick(&chan->push);
    85	
    86			if (nvif_msec(chan->disp->device, 2000,
    87				if (NVIF_TV32(chan, NV507C, GET, PTR, >, 0))
    88					break;
    89			) < 0)
    90				return -ETIMEDOUT;
    91		}
    92	
  > 93		PUSH_RSVD(&chan->push, PUSH_JUMP(&chan->push, 0));
    94		push->hw.cur = 0;
    95		return 0;
    96	}
    97	

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