drivers/gpu/drm/nouveau/nvif/chan.c:11:32: 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/torvalds/linux.git master
head:   e75a43c7cec459a07d91ed17de4de13ede2b7758
commit: d1fb887a08d8a21284e9a4be476f103353a32e7a drm/nouveau/nv50-: separate CHANNEL_GPFIFO handling out from CHANNEL_DMA
date:   12 months ago
config: sparc64-randconfig-r132-20260430 (https://download.01.org/0day-ci/archive/20260430/202604301541.JiYvVcb9-lkp@intel.com/config)
compiler: sparc64-linux-gcc (GCC) 8.5.0
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260430/202604301541.JiYvVcb9-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
| Fixes: d1fb887a08d8 ("drm/nouveau/nv50-: separate CHANNEL_GPFIFO handling out from CHANNEL_DMA")
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202604301541.JiYvVcb9-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/gpu/drm/nouveau/nvif/chan.c:11:32: sparse: sparse: cast removes address space '__iomem' of expression
   drivers/gpu/drm/nouveau/nvif/chan.c:71:29: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected void [noderef] __iomem *ptr @@     got void *userd @@
   drivers/gpu/drm/nouveau/nvif/chan.c:71:29: sparse:     expected void [noderef] __iomem *ptr
   drivers/gpu/drm/nouveau/nvif/chan.c:71:29: sparse:     got void *userd
   drivers/gpu/drm/nouveau/nvif/chan.c:73:30: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected void [noderef] __iomem *ptr @@     got void *gpfifo @@
   drivers/gpu/drm/nouveau/nvif/chan.c:73:30: sparse:     expected void [noderef] __iomem *ptr
   drivers/gpu/drm/nouveau/nvif/chan.c:73:30: sparse:     got void *gpfifo
   drivers/gpu/drm/nouveau/nvif/chan.c:77:39: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected void [noderef] __iomem *ptr @@     got void *push @@
   drivers/gpu/drm/nouveau/nvif/chan.c:77:39: sparse:     expected void [noderef] __iomem *ptr
   drivers/gpu/drm/nouveau/nvif/chan.c:77:39: sparse:     got void *push
   drivers/gpu/drm/nouveau/nvif/chan.c:89:32: sparse: sparse: cast removes address space '__iomem' of expression
   drivers/gpu/drm/nouveau/nvif/chan.c:123:22: sparse: sparse: cast removes address space '__iomem' of expression

vim +/__iomem +11 drivers/gpu/drm/nouveau/nvif/chan.c

     6	
     7	static void
     8	nvif_chan_gpfifo_push_kick(struct nvif_push *push)
     9	{
    10		struct nvif_chan *chan = container_of(push, typeof(*chan), push);
  > 11		u32 put = push->bgn - (u32 *)chan->push.mem.object.map.ptr;
    12		u32 cnt = push->cur - push->bgn;
    13	
    14		chan->func->gpfifo.push(chan, true, chan->push.addr + (put << 2), cnt << 2, false);
    15		chan->func->gpfifo.kick(chan);
    16	}
    17	

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