linux-kernel - Re: [PATCH v4 1/4] iommu/amd: Add support to remap/unmap IOMMU buffers for kdump

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Message-ID: <202507241929.76UExdsw-lkp@intel.com>
Date: Thu, 24 Jul 2025 20:00:01 +0800
From: kernel test robot <lkp@...el.com>
To: Ashish Kalra <Ashish.Kalra@....com>, joro@...tes.org,
	suravee.suthikulpanit@....com, thomas.lendacky@....com,
	Sairaj.ArunKodilkar@....com, Vasant.Hegde@....com,
	herbert@...dor.apana.org.au
Cc: oe-kbuild-all@...ts.linux.dev, seanjc@...gle.com, pbonzini@...hat.com,
	will@...nel.org, robin.murphy@....com, john.allen@....com,
	davem@...emloft.net, michael.roth@....com, iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
	kvm@...r.kernel.org
Subject: Re: [PATCH v4 1/4] iommu/amd: Add support to remap/unmap IOMMU
 buffers for kdump

Hi Ashish,

kernel test robot noticed the following build warnings:

[auto build test WARNING on herbert-cryptodev-2.6/master]
[also build test WARNING on herbert-crypto-2.6/master linus/master v6.16-rc7 next-20250724]
[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/Ashish-Kalra/iommu-amd-Add-support-to-remap-unmap-IOMMU-buffers-for-kdump/20250722-055642
base:   https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git master
patch link:    https://lore.kernel.org/r/6a48567cd99a0ef915862b3c6590d1415d287870.1753133022.git.ashish.kalra%40amd.com
patch subject: [PATCH v4 1/4] iommu/amd: Add support to remap/unmap IOMMU buffers for kdump
config: x86_64-randconfig-r133-20250724 (https://download.01.org/0day-ci/archive/20250724/202507241929.76UExdsw-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14+deb12u1) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250724/202507241929.76UExdsw-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/202507241929.76UExdsw-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/iommu/amd/init.c:723:41: sparse: sparse: incorrect type in return expression (different address spaces) @@     expected void * @@     got void [noderef] __iomem * @@
   drivers/iommu/amd/init.c:723:41: sparse:     expected void *
   drivers/iommu/amd/init.c:723:41: sparse:     got void [noderef] __iomem *
>> drivers/iommu/amd/init.c:723:41: sparse: sparse: incorrect type in return expression (different address spaces) @@     expected void * @@     got void [noderef] __iomem * @@
   drivers/iommu/amd/init.c:723:41: sparse:     expected void *
   drivers/iommu/amd/init.c:723:41: sparse:     got void [noderef] __iomem *
>> drivers/iommu/amd/init.c:723:41: sparse: sparse: incorrect type in return expression (different address spaces) @@     expected void * @@     got void [noderef] __iomem * @@
   drivers/iommu/amd/init.c:723:41: sparse:     expected void *
   drivers/iommu/amd/init.c:723:41: sparse:     got void [noderef] __iomem *

vim +723 drivers/iommu/amd/init.c

   707	
   708	static inline void *iommu_memremap(unsigned long paddr, size_t size)
   709	{
   710		phys_addr_t phys;
   711	
   712		if (!paddr)
   713			return NULL;
   714	
   715		/*
   716		 * Obtain true physical address in kdump kernel when SME is enabled.
   717		 * Currently, previous kernel with SME enabled and kdump kernel
   718		 * with SME support disabled is not supported.
   719		 */
   720		phys = __sme_clr(paddr);
   721	
   722		if (cc_platform_has(CC_ATTR_HOST_MEM_ENCRYPT))
 > 723			return ioremap_encrypted(phys, size);
   724		else
   725			return memremap(phys, size, MEMREMAP_WB);
   726	}
   727	

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