linux-kernel - drivers/gpu/drm/nouveau/dispnv50/crcca7d.c:28:17: sparse: sparse: cast removes address space '_

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Message-ID: <202601162023.AzRe6Ekz-lkp@intel.com>
Date: Fri, 16 Jan 2026 20:28:21 +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/dispnv50/crcca7d.c:28:17: sparse:
 sparse: cast removes address space '__iomem' of expression

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   983d014aafb14ee5e4915465bf8948e8f3a723b5
commit: 6cc6e08d4542473d79ea83d9123d9d35e9c01c92 drm/nouveau/kms: add support for GB20x
date:   8 months ago
config: x86_64-randconfig-121-20260113 (https://download.01.org/0day-ci/archive/20260116/202601162023.AzRe6Ekz-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
rustc: rustc 1.88.0 (6b00bc388 2025-06-23)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260116/202601162023.AzRe6Ekz-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/202601162023.AzRe6Ekz-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   drivers/gpu/drm/nouveau/dispnv50/crcca7d.c: note: in included file (through drivers/gpu/drm/nouveau/nouveau_drv.h, drivers/gpu/drm/nouveau/nouveau_display.h, ...):
   drivers/gpu/drm/nouveau/include/nvif/ioctl.h:9:1: sparse: sparse: directive in macro's argument list
   drivers/gpu/drm/nouveau/include/nvif/ioctl.h:10:1: sparse: sparse: directive in macro's argument list
   drivers/gpu/drm/nouveau/include/nvif/ioctl.h:11:1: sparse: sparse: directive in macro's argument list
   drivers/gpu/drm/nouveau/include/nvif/ioctl.h:12:1: sparse: sparse: directive in macro's argument list
   drivers/gpu/drm/nouveau/include/nvif/ioctl.h:13:1: sparse: sparse: directive in macro's argument list
   drivers/gpu/drm/nouveau/include/nvif/ioctl.h:14:1: sparse: sparse: directive in macro's argument list
   drivers/gpu/drm/nouveau/include/nvif/ioctl.h:17:1: sparse: sparse: directive in macro's argument list
   drivers/gpu/drm/nouveau/include/nvif/ioctl.h:18:1: sparse: sparse: directive in macro's argument list
   drivers/gpu/drm/nouveau/include/nvif/ioctl.h:20:1: sparse: sparse: directive in macro's argument list
   drivers/gpu/drm/nouveau/include/nvif/ioctl.h:21:1: sparse: sparse: directive in macro's argument list
>> drivers/gpu/drm/nouveau/dispnv50/crcca7d.c:28:17: sparse: sparse: cast removes address space '__iomem' of expression
>> drivers/gpu/drm/nouveau/dispnv50/crcca7d.c:28:17: sparse: sparse: cast removes address space '__iomem' of expression
>> drivers/gpu/drm/nouveau/dispnv50/crcca7d.c:28:17: sparse: sparse: cast removes address space '__iomem' of expression
   drivers/gpu/drm/nouveau/dispnv50/crcca7d.c:35:17: sparse: sparse: cast removes address space '__iomem' of expression
   drivers/gpu/drm/nouveau/dispnv50/crcca7d.c:35:17: sparse: sparse: cast removes address space '__iomem' of expression
   drivers/gpu/drm/nouveau/dispnv50/crcca7d.c:55:17: sparse: sparse: cast removes address space '__iomem' of expression
   drivers/gpu/drm/nouveau/dispnv50/crcca7d.c:55:17: sparse: sparse: cast removes address space '__iomem' of expression
   drivers/gpu/drm/nouveau/dispnv50/crcca7d.c:79:9: sparse: sparse: cast removes address space '__iomem' of expression
   drivers/gpu/drm/nouveau/dispnv50/crcca7d.c:79:9: sparse: sparse: cast removes address space '__iomem' of expression

vim +/__iomem +28 drivers/gpu/drm/nouveau/dispnv50/crcca7d.c

    12	
    13	static int
    14	crcca7d_set_ctx(struct nv50_head *head, struct nv50_crc_notifier_ctx *ctx)
    15	{
    16		struct nvif_push *push = &head->disp->core->chan.push;
    17		const int i = head->base.index;
    18		int ret;
    19	
    20		ret = PUSH_WAIT(push, ctx ? 3 : 2);
    21		if (ret)
    22			return ret;
    23	
    24		if (ctx) {
    25			const u32 crc_hi = upper_32_bits(ctx->mem.addr);
    26			const u32 crc_lo = lower_32_bits(ctx->mem.addr);
    27	
  > 28			PUSH_MTHD(push, NVCA7D, HEAD_SET_SURFACE_ADDRESS_HI_CRC(i), crc_hi,
    29	
    30						HEAD_SET_SURFACE_ADDRESS_LO_CRC(i),
    31				  NVVAL(NVCA7D, HEAD_SET_SURFACE_ADDRESS_LO_CRC, ADDRESS_LO, crc_lo >> 4) |
    32				  NVDEF(NVCA7D, HEAD_SET_SURFACE_ADDRESS_LO_CRC, TARGET, PHYSICAL_NVM) |
    33				  NVDEF(NVCA7D, HEAD_SET_SURFACE_ADDRESS_LO_CRC, ENABLE, ENABLE));
    34		} else {
    35			PUSH_MTHD(push, NVCA7D, HEAD_SET_SURFACE_ADDRESS_LO_CRC(i),
    36				  NVDEF(NVCA7D, HEAD_SET_SURFACE_ADDRESS_LO_CRC, ENABLE, DISABLE));
    37		}
    38	
    39		return 0;
    40	}
    41	

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