[linux-next:master 12573/13550] kernel/dma/swiotlb.c:771:5: error: implicit declaration of function 'debugfs_create_dir'; did you mean 'kernfs_create_dir'?

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   8702f95941c215501826ea8743a8b64b83479209
commit: 461021875c5057b3a408db0aa91b15119064ffa8 [12573/13550] swiotlb: Add restricted DMA pool initialization
config: microblaze-randconfig-r016-20210625 (attached as .config)
compiler: microblaze-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=461021875c5057b3a408db0aa91b15119064ffa8
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout 461021875c5057b3a408db0aa91b15119064ffa8
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=microblaze 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <redacted>

All errors (new ones prefixed by >>):

   kernel/dma/swiotlb.c: In function 'rmem_swiotlb_device_init':

quoted

kernel/dma/swiotlb.c:771:5: error: implicit declaration of function 'debugfs_create_dir'; did you mean 'kernfs_create_dir'? [-Werror=implicit-function-declaration]

     771 |     debugfs_create_dir(rmem->name, debugfs_dir);
         |     ^~~~~~~~~~~~~~~~~~
         |     kernfs_create_dir

quoted

kernel/dma/swiotlb.c:771:36: error: 'debugfs_dir' undeclared (first use in this function)

     771 |     debugfs_create_dir(rmem->name, debugfs_dir);
         |                                    ^~~~~~~~~~~
   kernel/dma/swiotlb.c:771:36: note: each undeclared identifier is reported only once for each function it appears in

quoted

kernel/dma/swiotlb.c:772:4: error: implicit declaration of function 'swiotlb_create_debugfs_files' [-Werror=implicit-function-declaration]

     772 |    swiotlb_create_debugfs_files(mem);
         |    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +771 kernel/dma/swiotlb.c

   744	
   745	static int rmem_swiotlb_device_init(struct reserved_mem *rmem,
   746					    struct device *dev)
   747	{
   748		struct io_tlb_mem *mem = rmem->priv;
   749		unsigned long nslabs = rmem->size >> IO_TLB_SHIFT;
   750	
   751		/*
   752		 * Since multiple devices can share the same pool, the private data,
   753		 * io_tlb_mem struct, will be initialized by the first device attached
   754		 * to it.
   755		 */
   756		if (!mem) {
   757			mem = kzalloc(struct_size(mem, slots, nslabs), GFP_KERNEL);
   758			if (!mem)
   759				return -ENOMEM;
   760	
   761			set_memory_decrypted((unsigned long)phys_to_virt(rmem->base),
   762					     rmem->size >> PAGE_SHIFT);
   763			swiotlb_init_io_tlb_mem(mem, rmem->base, nslabs, false);
   764			mem->force_bounce = true;
   765			mem->for_alloc = true;
   766	
   767			rmem->priv = mem;
   768	
   769			if (IS_ENABLED(CONFIG_DEBUG_FS)) {
   770				mem->debugfs =
 > 771					debugfs_create_dir(rmem->name, debugfs_dir);
 > 772				swiotlb_create_debugfs_files(mem);
   773			}
   774		}
   775	
   776		dev->dma_io_tlb_mem = mem;
   777	
   778		return 0;
   779	}
   780	

---
0-DAY CI Kernel Test Service, Intel Corporation
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