Re: [PATCH] Staging: iommu: Replace null pointer check with IS_ERR in arm_smmu_domain_alloc_user()

[kernel test robot <lkp@intel.com>]

Hi Dipendra,

kernel test robot noticed the following build errors:

[auto build test ERROR on staging/staging-testing]

url:    https://github.com/intel-lab-lkp/linux/commits/Dipendra-Khadka/Staging-iommu-Replace-null-pointer-check-with-IS_ERR-in-arm_smmu_domain_alloc_user/20240922-235756
base:   staging/staging-testing
patch link:    https://lore.kernel.org/r/20240922155621.49432-1-kdipendra88%40gmail.com
patch subject: [PATCH] Staging: iommu:  Replace null pointer check with IS_ERR in arm_smmu_domain_alloc_user()
config: arm64-randconfig-003-20240925 (https://download.01.org/0day-ci/archive/20240925/202409250755.nLQtNlCf-lkp@intel.com/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 7773243d9916f98ba0ffce0c3a960e4aa9f03e81)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240925/202409250755.nLQtNlCf-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202409250755.nLQtNlCf-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c:15:
   In file included from include/linux/crash_dump.h:5:
   In file included from include/linux/kexec.h:18:
   In file included from include/linux/vmcore_info.h:6:
   In file included from include/linux/elfcore.h:11:
   In file included from include/linux/ptrace.h:10:
   In file included from include/linux/pid_namespace.h:7:
   In file included from include/linux/mm.h:2228:
   include/linux/vmstat.h:514:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     514 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
>> drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c:3066:10: error: incompatible pointer types returning 'struct arm_smmu_domain *' from a function with result type 'struct iommu_domain *' [-Werror,-Wincompatible-pointer-types]
    3066 |                 return smmu_domain;
         |                        ^~~~~~~~~~~
   1 warning and 1 error generated.


vim +3066 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c

  3048	
  3049	static struct iommu_domain *
  3050	arm_smmu_domain_alloc_user(struct device *dev, u32 flags,
  3051				   struct iommu_domain *parent,
  3052				   const struct iommu_user_data *user_data)
  3053	{
  3054		struct arm_smmu_master *master = dev_iommu_priv_get(dev);
  3055		const u32 PAGING_FLAGS = IOMMU_HWPT_ALLOC_DIRTY_TRACKING;
  3056		struct arm_smmu_domain *smmu_domain;
  3057		int ret;
  3058	
  3059		if (flags & ~PAGING_FLAGS)
  3060			return ERR_PTR(-EOPNOTSUPP);
  3061		if (parent || user_data)
  3062			return ERR_PTR(-EOPNOTSUPP);
  3063	
  3064		smmu_domain = arm_smmu_domain_alloc();
  3065		if (IS_ERR(smmu_domain))
> 3066			return smmu_domain;
  3067	
  3068		smmu_domain->domain.type = IOMMU_DOMAIN_UNMANAGED;
  3069		smmu_domain->domain.ops = arm_smmu_ops.default_domain_ops;
  3070		ret = arm_smmu_domain_finalise(smmu_domain, master->smmu, flags);
  3071		if (ret)
  3072			goto err_free;
  3073		return &smmu_domain->domain;
  3074	
  3075	err_free:
  3076		kfree(smmu_domain);
  3077		return ERR_PTR(ret);
  3078	}
  3079	

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