linux-kernel - drivers/gpu/drm/nouveau/nvif/chan.c:71:29: sparse: sparse: incorrect type in assignment (different address spaces)

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Message-ID: <202512140520.YnlRkcFb-lkp@intel.com>
Date: Sun, 14 Dec 2025 05:10:38 +0800
From: kernel test robot <lkp@...el.com>
To: Ben Skeggs <bskeggs@...dia.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Dave Airlie <airlied@...hat.com>, Timur Tabi <ttabi@...dia.com>
Subject: drivers/gpu/drm/nouveau/nvif/chan.c:71:29: sparse: sparse: incorrect
 type in assignment (different address spaces)

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   9d9c1cfec01cdbf24bd9322ed555713a20422115
commit: d1fb887a08d8a21284e9a4be476f103353a32e7a drm/nouveau/nv50-: separate CHANNEL_GPFIFO handling out from CHANNEL_DMA
date:   7 months ago
config: sparc64-randconfig-r133-20251213 (https://download.01.org/0day-ci/archive/20251214/202512140520.YnlRkcFb-lkp@intel.com/config)
compiler: sparc64-linux-gcc (GCC) 13.4.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251214/202512140520.YnlRkcFb-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202512140520.YnlRkcFb-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 +71 drivers/gpu/drm/nouveau/nvif/chan.c

    64	
    65	void
    66	nvif_chan_gpfifo_ctor(const struct nvif_chan_func *func, void *userd, void *gpfifo, u32 gpfifo_size,
    67			      void *push, u64 push_addr, u32 push_size, struct nvif_chan *chan)
    68	{
    69		chan->func = func;
    70	
  > 71		chan->userd.map.ptr = userd;
    72	
    73		chan->gpfifo.map.ptr = gpfifo;
    74		chan->gpfifo.max = (gpfifo_size >> 3) - 1;
    75		chan->gpfifo.free = chan->gpfifo.max;
    76	
    77		chan->push.mem.object.map.ptr = push;
    78		chan->push.wait = nvif_chan_gpfifo_push_wait;
    79		chan->push.kick = nvif_chan_gpfifo_push_kick;
    80		chan->push.addr = push_addr;
    81		chan->push.hw.max = push_size >> 2;
    82		chan->push.bgn = chan->push.cur = chan->push.end = push;
    83	}
    84	

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