linux-kernel - drivers/gpu/drm/nouveau/nvif/chanc36f.c:36:9: sparse: sparse: cast removes address space '_

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Message-ID: <202512140137.EYqILJ1z-lkp@intel.com>
Date: Sun, 14 Dec 2025 01:12:14 +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/chanc36f.c:36:9: sparse: sparse: cast
 removes address space '__iomem' of expression

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   9d9c1cfec01cdbf24bd9322ed555713a20422115
commit: 862450a85b85a3e88e9065c9d2421f3ef17d054c drm/nouveau/gf100-: track chan progress with non-WFI semaphore release
date:   7 months ago
config: powerpc-randconfig-r121-20251213 (https://download.01.org/0day-ci/archive/20251214/202512140137.EYqILJ1z-lkp@intel.com/config)
compiler: powerpc-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251214/202512140137.EYqILJ1z-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/202512140137.EYqILJ1z-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/gpu/drm/nouveau/nvif/chanc36f.c:36:9: sparse: sparse: cast removes address space '__iomem' of expression
>> drivers/gpu/drm/nouveau/nvif/chanc36f.c:36:9: sparse: sparse: cast removes address space '__iomem' of expression
>> drivers/gpu/drm/nouveau/nvif/chanc36f.c:36:9: sparse: sparse: cast removes address space '__iomem' of expression
>> drivers/gpu/drm/nouveau/nvif/chanc36f.c:36:9: sparse: sparse: cast removes address space '__iomem' of expression
   drivers/gpu/drm/nouveau/nvif/chanc36f.c:42:9: sparse: sparse: cast removes address space '__iomem' of expression
   drivers/gpu/drm/nouveau/nvif/chanc36f.c:42:9: sparse: sparse: cast removes address space '__iomem' of expression

vim +/__iomem +36 drivers/gpu/drm/nouveau/nvif/chanc36f.c

    25	
    26	static int
    27	nvif_chanc36f_sem_release(struct nvif_chan *chan, u64 addr, u32 data)
    28	{
    29		struct nvif_push *push = &chan->push;
    30		int ret;
    31	
    32		ret = PUSH_WAIT(push, NVIF_CHANC36F_SEM_RELEASE_SIZE);
    33		if (ret)
    34			return ret;
    35	
  > 36		PUSH_MTHD(push, NVC36F, SEM_ADDR_LO, lower_32_bits(addr),
    37	
    38					SEM_ADDR_HI, upper_32_bits(addr),
    39	
    40					SEM_PAYLOAD_LO, data);
    41	
    42		PUSH_MTHD(push, NVC36F, SEM_EXECUTE,
    43			  NVDEF(NVC36F, SEM_EXECUTE, OPERATION, RELEASE) |
    44			  NVDEF(NVC36F, SEM_EXECUTE, RELEASE_WFI, DIS) |
    45			  NVDEF(NVC36F, SEM_EXECUTE, PAYLOAD_SIZE, 32BIT) |
    46			  NVDEF(NVC36F, SEM_EXECUTE, RELEASE_TIMESTAMP, DIS));
    47	
    48		return 0;
    49	}
    50	

-- 
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https://github.com/intel/lkp-tests/wiki