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

kernel test robot
2026-01-20T10:50:00Z

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: alpha-allnoconfig (https://download.01.org/0day-ci/archive/20260120/202601201857.7LKBY5dB-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 15.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260120/202601201857.7LKBY5dB-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/202601201857.7LKBY5dB-lkp@intel.com/

All errors (new ones prefixed by >>):

In file included from kernel/dma/direct.h:10,
from kernel/dma/mapping.c:19:
include/linux/dma-direct.h: In function 'phys_to_dma':
>> include/linux/dma-direct.h:103:13: error: implicit declaration of function 'force_dma_unencrypted'; did you mean 'phys_to_dma_unencrypted'? [-Wimplicit-function-declaration]
103 | if (force_dma_unencrypted(dev))
| ^~~~~~~~~~~~~~~~~~~~~
| phys_to_dma_unencrypted
include/linux/dma-direct.h: At top level:
>> include/linux/dma-direct.h:125:20: error: conflicting types for 'force_dma_unencrypted'; have 'bool(struct device *)' {aka '_Bool(struct device *)'}
125 | static inline bool force_dma_unencrypted(struct device *dev)
| ^~~~~~~~~~~~~~~~~~~~~
include/linux/dma-direct.h:103:13: note: previous implicit declaration of 'force_dma_unencrypted' with type 'int()'
103 | if (force_dma_unencrypted(dev))
| ^~~~~~~~~~~~~~~~~~~~~

vim +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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