linux-kernel - drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmgm200.c:32:9: sparse: sparse: cast truncates bits from constant value (100000000 becomes 0)

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Date:   Wed, 13 Sep 2023 08:40:40 +0800
From:   kernel test robot <lkp@...el.com>
To:     Pali Rohár <pali@...nel.org>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Hans de Goede <hdegoede@...hat.com>
Subject: drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmgm200.c:32:9: sparse:
 sparse: cast truncates bits from constant value (100000000 becomes 0)

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   3669558bdf354cd352be955ef2764cde6a9bf5ec
commit: 6dd9eb95cb6d895be2827b40fd965d9ec2a0747b platform/x86: dell-wmi: Add WMI event 0x0012 0x0003 to the list
date:   1 year ago
config: i386-randconfig-061-20230909 (https://download.01.org/0day-ci/archive/20230913/202309130832.Qg1tPWee-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/20230913/202309130832.Qg1tPWee-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/202309130832.Qg1tPWee-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmgm200.c:32:9: sparse: sparse: cast truncates bits from constant value (100000000 becomes 0)
   drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmgm200.c:57:9: sparse: sparse: cast truncates bits from constant value (800000000 becomes 0)

vim +32 drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmgm200.c

5f300fed645597 Ben Skeggs 2017-11-01  26  
e12cf6ad43888c Ben Skeggs 2017-11-01  27  static void
e12cf6ad43888c Ben Skeggs 2017-11-01  28  gm200_vmm_pgt_sparse(struct nvkm_vmm *vmm,
e12cf6ad43888c Ben Skeggs 2017-11-01  29  		     struct nvkm_mmu_pt *pt, u32 ptei, u32 ptes)
e12cf6ad43888c Ben Skeggs 2017-11-01  30  {
e12cf6ad43888c Ben Skeggs 2017-11-01  31  	/* VALID_FALSE + VOL tells the MMU to treat the PTE as sparse. */
e12cf6ad43888c Ben Skeggs 2017-11-01 @32  	VMM_FO064(pt, vmm, ptei * 8, BIT_ULL(32) /* VOL. */, ptes);
e12cf6ad43888c Ben Skeggs 2017-11-01  33  }
e12cf6ad43888c Ben Skeggs 2017-11-01  34  

:::::: The code at line 32 was first introduced by commit
:::::: e12cf6ad43888c152c3b2edb59525587cd98a227 drm/nouveau/mmu/gm200,gm20b: implement new vmm backend

:::::: TO: Ben Skeggs <bskeggs@...hat.com>
:::::: CC: Ben Skeggs <bskeggs@...hat.com>

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