linux-kernel - drivers/gpu/drm/nouveau/dispnv50/crcc57d.c:40:17: sparse: sparse: cast removes address space '_

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Date:   Fri, 14 Jan 2022 01:41:01 +0800
From:   kernel test robot <lkp@...el.com>
To:     Lyude Paul <lyude@...hat.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Karol Herbst <kherbst@...hat.com>,
        Ben Skeggs <bskeggs@...hat.com>
Subject: drivers/gpu/drm/nouveau/dispnv50/crcc57d.c:40:17: sparse: sparse:
 cast removes address space '__iomem' of expression

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   455e73a07f6e288b0061dfcf4fcf54fa9fe06458
commit: 57cbdbe65e5f9ba9bfd67b66bc3ce24ef1c54643 drm/nouveau/kms/nv140-: Use hard-coded wndws or core channel for CRC channel
date:   9 weeks ago
config: sparc64-randconfig-s032-20220113 (https://download.01.org/0day-ci/archive/20220114/202201140142.b2CYChpW-lkp@intel.com/config)
compiler: sparc64-linux-gcc (GCC) 11.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=57cbdbe65e5f9ba9bfd67b66bc3ce24ef1c54643
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 57cbdbe65e5f9ba9bfd67b66bc3ce24ef1c54643
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=sparc64 SHELL=/bin/bash drivers/gpu/drm/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>


sparse warnings: (new ones prefixed by >>)
>> drivers/gpu/drm/nouveau/dispnv50/crcc57d.c:40:17: sparse: sparse: cast removes address space '__iomem' of expression
>> drivers/gpu/drm/nouveau/dispnv50/crcc57d.c:40:17: sparse: sparse: cast removes address space '__iomem' of expression
   drivers/gpu/drm/nouveau/dispnv50/crcc57d.c:41:17: sparse: sparse: cast removes address space '__iomem' of expression
   drivers/gpu/drm/nouveau/dispnv50/crcc57d.c:41:17: sparse: sparse: cast removes address space '__iomem' of expression
   drivers/gpu/drm/nouveau/dispnv50/crcc57d.c:43:17: sparse: sparse: cast removes address space '__iomem' of expression
   drivers/gpu/drm/nouveau/dispnv50/crcc57d.c:43:17: sparse: sparse: cast removes address space '__iomem' of expression
   drivers/gpu/drm/nouveau/dispnv50/crcc57d.c:44:17: sparse: sparse: cast removes address space '__iomem' of expression
   drivers/gpu/drm/nouveau/dispnv50/crcc57d.c:44:17: sparse: sparse: cast removes address space '__iomem' of expression

vim +/__iomem +40 drivers/gpu/drm/nouveau/dispnv50/crcc57d.c

    12	
    13	static int crcc57d_set_src(struct nv50_head *head, int or, enum nv50_crc_source_type source,
    14				   struct nv50_crc_notifier_ctx *ctx)
    15	{
    16		struct nvif_push *push = nv50_disp(head->base.base.dev)->core->chan.push;
    17		const int i = head->base.index;
    18		u32 crc_args = NVDEF(NVC57D, HEAD_SET_CRC_CONTROL, CONTROLLING_CHANNEL, CORE) |
    19			       NVDEF(NVC57D, HEAD_SET_CRC_CONTROL, EXPECT_BUFFER_COLLAPSE, FALSE) |
    20			       NVDEF(NVC57D, HEAD_SET_CRC_CONTROL, SECONDARY_CRC, NONE) |
    21			       NVDEF(NVC57D, HEAD_SET_CRC_CONTROL, CRC_DURING_SNOOZE, DISABLE);
    22		int ret;
    23	
    24		switch (source) {
    25		case NV50_CRC_SOURCE_TYPE_SOR:
    26			crc_args |= NVDEF(NVC57D, HEAD_SET_CRC_CONTROL, PRIMARY_CRC, SOR(or));
    27			break;
    28		case NV50_CRC_SOURCE_TYPE_SF:
    29			crc_args |= NVDEF(NVC57D, HEAD_SET_CRC_CONTROL, PRIMARY_CRC, SF);
    30			break;
    31		default:
    32			break;
    33		}
    34	
    35		ret = PUSH_WAIT(push, 4);
    36		if (ret)
    37			return ret;
    38	
    39		if (source) {
  > 40			PUSH_MTHD(push, NVC57D, HEAD_SET_CONTEXT_DMA_CRC(i), ctx->ntfy.handle);
    41			PUSH_MTHD(push, NVC57D, HEAD_SET_CRC_CONTROL(i), crc_args);
    42		} else {
    43			PUSH_MTHD(push, NVC57D, HEAD_SET_CRC_CONTROL(i), 0);
    44			PUSH_MTHD(push, NVC57D, HEAD_SET_CONTEXT_DMA_CRC(i), 0);
    45		}
    46	
    47		return 0;
    48	}
    49	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org