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

kernel test robot
2026-01-20T09:33:54Z

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@intel.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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