linux-kernel - Re: [PATCH 2/2] dma-direct: Make phys_to_dma() pick encrypted vs unencrypted per device

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Message-ID: <202601201747.22JsrCCp-lkp@intel.com>
Date: Tue, 20 Jan 2026 17:33:27 +0800
From: kernel test robot <lkp@...el.com>
To: "Aneesh Kumar K.V (Arm)" <aneesh.kumar@...nel.org>,
	linux-kernel@...r.kernel.org, iommu@...ts.linux.dev,
	linux-coco@...ts.linux.dev
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	Catalin Marinas <catalin.marinas@....com>, will@...nel.org,
	robin.murphy@....com, suzuki.poulose@....com, jgg@...pe.ca,
	steven.price@....com, Marek Szyprowski <m.szyprowski@...sung.com>,
	"Aneesh Kumar K.V (Arm)" <aneesh.kumar@...nel.org>
Subject: Re: [PATCH 2/2] dma-direct: Make phys_to_dma() pick encrypted vs
 unencrypted per device

Hi Aneesh,

kernel test robot noticed the following build errors:

[auto build test ERROR on linus/master]
[also build test ERROR on v6.19-rc6 next-20260119]
[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/Aneesh-Kumar-K-V-Arm/dma-direct-Make-phys_to_dma-pick-encrypted-vs-unencrypted-per-device/20260120-145025
base:   linus/master
patch link:    https://lore.kernel.org/r/20260120064255.179425-2-aneesh.kumar%40kernel.org
patch subject: [PATCH 2/2] dma-direct: Make phys_to_dma() pick encrypted vs unencrypted per device
config: arm-allnoconfig (https://download.01.org/0day-ci/archive/20260120/202601201747.22JsrCCp-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 9b8addffa70cee5b2acc5454712d9cf78ce45710)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260120/202601201747.22JsrCCp-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/202601201747.22JsrCCp-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from kernel/dma/mapping.c:19:
   In file included from kernel/dma/direct.h:10:
>> include/linux/dma-direct.h:103:6: error: call to undeclared function 'force_dma_unencrypted'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     103 |         if (force_dma_unencrypted(dev))
         |             ^
   include/linux/dma-direct.h:103:6: note: did you mean 'phys_to_dma_unencrypted'?
   include/linux/dma-direct.h:88:26: note: 'phys_to_dma_unencrypted' declared here
      88 | static inline dma_addr_t phys_to_dma_unencrypted(struct device *dev,
         |                          ^
      89 |                                                 phys_addr_t paddr)
      90 | {
      91 |         return dma_addr_unencrypted(__phys_to_dma(dev, paddr));
      92 | }
      93 | 
      94 | static inline dma_addr_t phys_to_dma_encrypted(struct device *dev,
      95 |                                                phys_addr_t paddr)
      96 | {
      97 |         return dma_addr_encrypted(__phys_to_dma(dev, paddr));
      98 | }
      99 | 
     100 | static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
     101 | {
     102 | 
     103 |         if (force_dma_unencrypted(dev))
         |             ~~~~~~~~~~~~~~~~~~~~~
         |             phys_to_dma_unencrypted
>> include/linux/dma-direct.h:125:20: error: conflicting types for 'force_dma_unencrypted'
     125 | static inline bool force_dma_unencrypted(struct device *dev)
         |                    ^
   include/linux/dma-direct.h:103:6: note: previous implicit declaration is here
     103 |         if (force_dma_unencrypted(dev))
         |             ^
   2 errors generated.


vim +/force_dma_unencrypted +103 include/linux/dma-direct.h

   102	
 > 103		if (force_dma_unencrypted(dev))
   104			return phys_to_dma_unencrypted(dev, paddr);
   105		return phys_to_dma_encrypted(dev, paddr);
   106	}
   107	
   108	static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dma_addr)
   109	{
   110		phys_addr_t paddr;
   111	
   112		dma_addr = dma_addr_canonical(dma_addr);
   113		if (dev->dma_range_map)
   114			paddr = translate_dma_to_phys(dev, dma_addr);
   115		else
   116			paddr = dma_addr;
   117	
   118		return paddr;
   119	}
   120	#endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */
   121	
   122	#ifdef CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTED
   123	bool force_dma_unencrypted(struct device *dev);
   124	#else
 > 125	static inline bool force_dma_unencrypted(struct device *dev)
   126	{
   127		return false;
   128	}
   129	#endif /* CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTED */
   130	

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