Re: [PATCH] dma-buf: add no-op stubs when CONFIG_DMA_SHARED_BUFFER is disabled

Re: [PATCH] dma-buf: add no-op stubs when CONFIG_DMA_SHARED_BUFFER is disabled

[kernel test robot]

Hi Viresh,

kernel test robot noticed the following build warnings:

[auto build test WARNING on sailus-media-tree/master]
[also build test WARNING on linus/master v6.18-rc7 next-20251127]
[cannot apply to sailus-media-tree/streams]
[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/Viresh-Kumar/dma-buf-add-no-op-stubs-when-CONFIG_DMA_SHARED_BUFFER-is-disabled/20251127-154307
base:   git://linuxtv.org/sailus/media_tree.git master
patch link:    https://lore.kernel.org/r/6202945f4af2d10e0fb6602b25ff9cb454c1ee85.1764229204.git.viresh.kumar%40linaro.org
patch subject: [PATCH] dma-buf: add no-op stubs when CONFIG_DMA_SHARED_BUFFER is disabled
config: x86_64-allnoconfig (https://download.01.org/0day-ci/archive/20251127/202511271739.cjidjUdn-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251127/202511271739.cjidjUdn-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/202511271739.cjidjUdn-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from io_uring/io_uring.c:101:
   In file included from io_uring/zcrx.h:6:
>> include/linux/dma-buf.h:660:51: warning: omitting the parameter name in a function definition is a C23 extension [-Wc23-extensions]
     660 | dma_buf_map_attachment(struct dma_buf_attachment *, enum dma_data_direction)
         |                                                   ^
   include/linux/dma-buf.h:660:76: warning: omitting the parameter name in a function definition is a C23 extension [-Wc23-extensions]
     660 | dma_buf_map_attachment(struct dma_buf_attachment *, enum dma_data_direction)
         |                                                                            ^
   include/linux/dma-buf.h:665:72: warning: omitting the parameter name in a function definition is a C23 extension [-Wc23-extensions]
     665 | static inline void dma_buf_unmap_attachment(struct dma_buf_attachment *,
         |                                                                        ^
   include/linux/dma-buf.h:666:27: warning: omitting the parameter name in a function definition is a C23 extension [-Wc23-extensions]
     666 |                                             struct sg_table *,
         |                                                              ^
   include/linux/dma-buf.h:667:33: warning: omitting the parameter name in a function definition is a C23 extension [-Wc23-extensions]
     667 |                                             enum dma_data_direction) { }
         |                                                                    ^
   include/linux/dma-buf.h:695:48: warning: omitting the parameter name in a function definition is a C23 extension [-Wc23-extensions]
     695 | static inline int dma_buf_mmap(struct dma_buf *, struct vm_area_struct *,
         |                                                ^
   include/linux/dma-buf.h:695:73: warning: omitting the parameter name in a function definition is a C23 extension [-Wc23-extensions]
     695 | static inline int dma_buf_mmap(struct dma_buf *, struct vm_area_struct *,
         |                                                                         ^
   include/linux/dma-buf.h:696:24: warning: omitting the parameter name in a function definition is a C23 extension [-Wc23-extensions]
     696 |                                unsigned long)
         |                                             ^
   8 warnings generated.


vim +660 include/linux/dma-buf.h

   658	
   659	static inline struct sg_table *
 > 660	dma_buf_map_attachment(struct dma_buf_attachment *, enum dma_data_direction)
   661	{
   662		return NULL;
   663	}
   664	

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