[hch-misc:dma_alloc_pages /6] kernel/dma/mapping.c:399:2: error: implicit declaration of function 'dma_free_contiguous'; did you mean 'set_zone_contiguous'?

[hch-misc:dma_alloc_pages /6] kernel/dma/mapping.c:399:2: error: implicit declaration of function 'dma_free_contiguous'; did you mean 'set_zone_contiguous'?

[kbuild test robot]

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tree:   git://git.infradead.org/users/hch/misc.git dma_alloc_pages
head:   9321e87b6405e6a6af978c0221fac97faef5a5e3
commit: aadd1578979b47af197cf5acedc2a63d068e357e [/6] dma-mapping: add a new dma_alloc_pages API
config: powerpc-allmodconfig (attached as .config)
compiler: powerpc64-linux-gcc (GCC) 7.4.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout aadd1578979b47af197cf5acedc2a63d068e357e
        # save the attached .config to linux build tree
        GCC_VERSION=7.4.0 make.cross ARCH=powerpc 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>

Note: the hch-misc/dma_alloc_pages HEAD 9321e87b6405e6a6af978c0221fac97faef5a5e3 builds fine.
      It only hurts bisectibility.

All errors (new ones prefixed by >>):

   kernel/dma/mapping.c: In function 'dma_alloc_pages':
   kernel/dma/mapping.c:387:9: error: implicit declaration of function 'dma_alloc_contiguous'; did you mean 'dma_alloc_coherent'? [-Werror=implicit-function-declaration]
     return dma_alloc_contiguous(dev, size, gfp);
            ^~~~~~~~~~~~~~~~~~~~
            dma_alloc_coherent
   kernel/dma/mapping.c:387:9: warning: return makes pointer from integer without a cast [-Wint-conversion]
     return dma_alloc_contiguous(dev, size, gfp);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   kernel/dma/mapping.c: In function 'dma_free_pages':
>> kernel/dma/mapping.c:399:2: error: implicit declaration of function 'dma_free_contiguous'; did you mean 'set_zone_contiguous'? [-Werror=implicit-function-declaration]
     dma_free_contiguous(dev, page, size);
     ^~~~~~~~~~~~~~~~~~~
     set_zone_contiguous
   cc1: some warnings being treated as errors

vim +399 kernel/dma/mapping.c

   347	
   348	/**
   349	 * dma_alloc_pages - allocate memory that is DMA addressable by a device
   350	 * @dev:	device the memory is allocated for
   351	 * @size:	size of the memory to be allocated
   352	 * @gfp:	GFP_* mask for the memory allocation
   353	 *
   354	 * This function allocates memory which is guaranteed to be DMA addressable
   355	 * by @dev when later mapped for DMA using the dma_map_page(), dma_map_single(),
   356	 * or dma_map_sg() functions.
   357	 */
   358	struct page *dma_alloc_pages(struct device *dev, size_t size, gfp_t gfp)
   359	{
   360		const struct dma_map_ops *ops = get_dma_ops(dev);
   361	
   362		/* let the implementation decide on the zone to allocate from: */
   363		if (WARN_ON_ONCE(gfp & (__GFP_DMA | __GFP_DMA32)))
   364			return NULL;
   365	
   366		/* we must zero all memory to avoid information leaks */
   367		gfp |= __GFP_ZERO;
   368	
   369		if (dma_is_direct(ops))
   370			return dma_direct_alloc_pages(dev, size, gfp);
   371	
   372		/*
   373		 * Must return a page from the page allocator or CMA.
   374		 */
   375		if (ops->alloc_pages)
   376			return ops->alloc_pages(dev, size, gfp);
   377	
   378		/*
   379		 * Everything that looks remotely like an IOMMU should be able to map
   380		 * any system memory into at least 32-bit of dma_addr_t.
   381		 */
   382		if (dev->coherent_dma_mask < 32) {
   383			dev_warn(dev, "can't support DMA page allocation for DMA mask < 32-bit\n");
   384			return NULL;
   385		}
   386	
 > 387		return dma_alloc_contiguous(dev, size, gfp);
   388	}
   389	EXPORT_SYMBOL_GPL(dma_alloc_pages);
   390	
   391	/**
   392	 * dma_free_pages - free memory allocated by dma_alloc_pages()
   393	 * @dev:	device the memory is allocated for
   394	 * @page:	the memory to be freed
   395	 * @size:	size of the memory to be freed
   396	 */
   397	void dma_free_pages(struct device *dev, struct page *page, size_t size)
   398	{
 > 399		dma_free_contiguous(dev, page, size);
   400	}
   401	EXPORT_SYMBOL_GPL(dma_free_pages);
   402	

---
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