linux-kernel - Re: [PATCH] Introduce dmam_zalloc

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Date:   Thu, 10 Aug 2017 01:44:13 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Michael Moese <michael.moese@....de>
Cc:     kbuild-all@...org, Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        linux-kernel@...r.kernel.org, Michael Moese <michael.moese@....de>
Subject: Re: [PATCH] Introduce dmam_zalloc_coherent()

Hi Michael,

[auto build test ERROR on linus/master]
[also build test ERROR on v4.13-rc4 next-20170808]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Michael-Moese/Introduce-dmam_zalloc_coherent/20170810-011949
config: i386-tinyconfig (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   In file included from include/linux/skbuff.h:34:0,
                    from include/net/net_namespace.h:34,
                    from include/linux/inet.h:46,
                    from include/linux/sunrpc/msg_prot.h:203,
                    from include/linux/sunrpc/auth.h:15,
                    from include/linux/nfs_fs.h:29,
                    from init/do_mounts.c:32:
>> include/linux/dma-mapping.h:765:21: error: redefinition of 'dma_zalloc_coherent'
    static inline void *dma_zalloc_coherent(struct device *dev, size_t size,
                        ^~~~~~~~~~~~~~~~~~~
   include/linux/dma-mapping.h:691:21: note: previous definition of 'dma_zalloc_coherent' was here
    static inline void *dma_zalloc_coherent(struct device *dev, size_t size,
                        ^~~~~~~~~~~~~~~~~~~

vim +/dma_zalloc_coherent +765 include/linux/dma-mapping.h

   753	
   754	/*
   755	 * Managed DMA API
   756	 */
   757	extern void *dmam_alloc_coherent(struct device *dev, size_t size,
   758					 dma_addr_t *dma_handle, gfp_t gfp);
   759	extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
   760				       dma_addr_t dma_handle);
   761	extern void *dmam_alloc_attrs(struct device *dev, size_t size,
   762				      dma_addr_t *dma_handle, gfp_t gfp,
   763				      unsigned long attrs);
   764	
 > 765	static inline void *dma_zalloc_coherent(struct device *dev, size_t size,
   766						dma_addr_t *dma_handle, gfp_t flag)
   767	{
   768		void *ret = dmam_alloc_coherent(dev, size, dma_handle,
   769						flag | __GFP_ZERO);
   770		return ret;
   771	}
   772	

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