linux-kernel - drivers/gpu/drm/nouveau/dispnv50/disp.c:134:31: sparse: sparse: subtraction of different types can't work (different address spaces)

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Date: Mon, 22 Jan 2024 22:32:33 +0800
From: kernel test robot <lkp@...el.com>
To: ruanjinjie <ruanjinjie@...wei.com>
CC: <oe-kbuild-all@...ts.linux.dev>, <linux-kernel@...r.kernel.org>, "Lyude
 Paul" <lyude@...hat.com>
Subject: drivers/gpu/drm/nouveau/dispnv50/disp.c:134:31: sparse: sparse:
 subtraction of different types can't work (different address spaces)

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   52b1853b080a082ec3749c3a9577f6c71b1d4a90
commit: 9cf06d6ef7fd08adf51568b704ab7ba6007b6fe8 drm/nouveau/disp: fix cast removes address space of expression warnings
date:   1 year, 3 months ago
:::::: branch date: 7 hours ago
:::::: commit date: 1 year, 3 months ago
config: i386-randconfig-062-20240106 (https://download.01.org/0day-ci/archive/20240107/202401071050.UrV4A3qz-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240107/202401071050.UrV4A3qz-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/r/202401071050.UrV4A3qz-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/gpu/drm/nouveau/dispnv50/disp.c:134:31: sparse: sparse: subtraction of different types can't work (different address spaces)
   drivers/gpu/drm/nouveau/dispnv50/disp.c:197:31: sparse: sparse: subtraction of different types can't work (different address spaces)
   drivers/gpu/drm/nouveau/dispnv50/disp.c:257:19: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected unsigned int [usertype] *ptr @@     got void [noderef] __iomem *ptr @@
   drivers/gpu/drm/nouveau/dispnv50/disp.c:261:25: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected unsigned int [usertype] *bgn @@     got void [noderef] __iomem *ptr @@

vim +134 drivers/gpu/drm/nouveau/dispnv50/disp.c

2853ccf09255aa Ben Skeggs 2020-06-20  128  
2853ccf09255aa Ben Skeggs 2020-06-20  129  static void
2853ccf09255aa Ben Skeggs 2020-06-20  130  nv50_dmac_kick(struct nvif_push *push)
2853ccf09255aa Ben Skeggs 2020-06-20  131  {
2853ccf09255aa Ben Skeggs 2020-06-20  132  	struct nv50_dmac *dmac = container_of(push, typeof(*dmac), _push);
0a96099691c8cd Ben Skeggs 2020-07-21  133  
9cf06d6ef7fd08 ruanjinjie 2022-09-24 @134  	dmac->cur = push->cur - (u32 __iomem *)dmac->_push.mem.object.map.ptr;
0a96099691c8cd Ben Skeggs 2020-07-21  135  	if (dmac->put != dmac->cur) {
0a96099691c8cd Ben Skeggs 2020-07-21  136  		/* Push buffer fetches are not coherent with BAR1, we need to ensure
0a96099691c8cd Ben Skeggs 2020-07-21  137  		 * writes have been flushed right through to VRAM before writing PUT.
0a96099691c8cd Ben Skeggs 2020-07-21  138  		 */
0a96099691c8cd Ben Skeggs 2020-07-21  139  		if (dmac->push->mem.type & NVIF_MEM_VRAM) {
0a96099691c8cd Ben Skeggs 2020-07-21  140  			struct nvif_device *device = dmac->base.device;
0a96099691c8cd Ben Skeggs 2020-07-21  141  			nvif_wr32(&device->object, 0x070000, 0x00000001);
0a96099691c8cd Ben Skeggs 2020-07-21  142  			nvif_msec(device, 2000,
0a96099691c8cd Ben Skeggs 2020-07-21  143  				if (!(nvif_rd32(&device->object, 0x070000) & 0x00000002))
0a96099691c8cd Ben Skeggs 2020-07-21  144  					break;
0a96099691c8cd Ben Skeggs 2020-07-21  145  			);
0a96099691c8cd Ben Skeggs 2020-07-21  146  		}
0a96099691c8cd Ben Skeggs 2020-07-21  147  
0a96099691c8cd Ben Skeggs 2020-07-21  148  		NVIF_WV32(&dmac->base.user, NV507C, PUT, PTR, dmac->cur);
0a96099691c8cd Ben Skeggs 2020-07-21  149  		dmac->put = dmac->cur;
0a96099691c8cd Ben Skeggs 2020-07-21  150  	}
0a96099691c8cd Ben Skeggs 2020-07-21  151  
0a96099691c8cd Ben Skeggs 2020-07-21  152  	push->bgn = push->cur;
0a96099691c8cd Ben Skeggs 2020-07-21  153  }
0a96099691c8cd Ben Skeggs 2020-07-21  154  

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