linux-kernel - Re: [PATCH v3 3/7] iommu/arm-smmu-v3: Introduce a per-domain arm_smmu

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Message-ID: <202510172156.WHU485ad-lkp@intel.com>
Date: Fri, 17 Oct 2025 21:47:07 +0800
From: kernel test robot <lkp@...el.com>
To: Nicolin Chen <nicolinc@...dia.com>, will@...nel.org, jgg@...dia.com
Cc: oe-kbuild-all@...ts.linux.dev, jean-philippe@...aro.org,
	robin.murphy@....com, joro@...tes.org, balbirs@...dia.com,
	miko.lenczewski@....com, peterz@...radead.org, kevin.tian@...el.com,
	praan@...gle.com, linux-arm-kernel@...ts.infradead.org,
	iommu@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/7] iommu/arm-smmu-v3: Introduce a per-domain
 arm_smmu_invs array

Hi Nicolin,

kernel test robot noticed the following build warnings:

[auto build test WARNING on soc/for-next]
[also build test WARNING on linus/master v6.18-rc1 next-20251016]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Nicolin-Chen/iommu-arm-smmu-v3-Explicitly-set-smmu_domain-stage-for-SVA/20251016-034754
base:   https://git.kernel.org/pub/scm/linux/kernel/git/soc/soc.git for-next
patch link:    https://lore.kernel.org/r/345bb7703ebd19992694758b47e371900267fa0e.1760555863.git.nicolinc%40nvidia.com
patch subject: [PATCH v3 3/7] iommu/arm-smmu-v3: Introduce a per-domain arm_smmu_invs array
config: arm64-randconfig-r123-20251017 (https://download.01.org/0day-ci/archive/20251017/202510172156.WHU485ad-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 754ebc6ebb9fb9fbee7aef33478c74ea74949853)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251017/202510172156.WHU485ad-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/202510172156.WHU485ad-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c: note: in included file:
>> drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h:1048:9: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected struct callback_head *head @@     got struct callback_head [noderef] __rcu * @@
   drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h:1048:9: sparse:     expected struct callback_head *head
   drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h:1048:9: sparse:     got struct callback_head [noderef] __rcu *
>> drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h:1048:9: sparse: sparse: cast removes address space '__rcu' of expression
--
   drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c: note: in included file (through arch/arm64/include/asm/atomic.h, include/linux/atomic.h, include/asm-generic/bitops/atomic.h, ...):
   arch/arm64/include/asm/cmpxchg.h:168:1: sparse: sparse: cast truncates bits from constant value (ffffffff80000000 becomes 0)
   arch/arm64/include/asm/cmpxchg.h:168:1: sparse: sparse: cast truncates bits from constant value (ffffffff80000000 becomes 0)
   drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c: note: in included file:
>> drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h:1048:9: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected struct callback_head *head @@     got struct callback_head [noderef] __rcu * @@
   drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h:1048:9: sparse:     expected struct callback_head *head
   drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h:1048:9: sparse:     got struct callback_head [noderef] __rcu *
>> drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h:1048:9: sparse: sparse: cast removes address space '__rcu' of expression
>> drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h:1048:9: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected struct callback_head *head @@     got struct callback_head [noderef] __rcu * @@
   drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h:1048:9: sparse:     expected struct callback_head *head
   drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h:1048:9: sparse:     got struct callback_head [noderef] __rcu *
>> drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h:1048:9: sparse: sparse: cast removes address space '__rcu' of expression

vim +1048 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h

  1045	
  1046	static inline void arm_smmu_domain_free(struct arm_smmu_domain *smmu_domain)
  1047	{
> 1048		kfree_rcu(smmu_domain->invs, rcu);
  1049		kfree(smmu_domain);
  1050	}
  1051	

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