tree:   https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next
head:   104f89a60ef5ec77d6f559eac4676844b3480740
commit: 155fcd8511de5f99c27a726e9153b87cce528b6e [3/23] swiotlb: Add is_swiotlb_active() function
config: i386-tinyconfig (attached as .config)
compiler: gcc-8 (Debian 8.2.0-14) 8.2.0
reproduce:
        git checkout 155fcd8511de5f99c27a726e9153b87cce528b6e
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   In file included from arch/x86/include/asm/swiotlb.h:5,
                    from arch/x86/include/asm/dma-mapping.h:13,
                    from include/linux/dma-mapping.h:261,
                    from include/linux/skbuff.h:34,
                    from include/net/net_namespace.h:36,
                    from include/linux/inet.h:46,
                    from include/linux/sunrpc/msg_prot.h:204,
                    from include/linux/sunrpc/auth.h:16,
                    from include/linux/nfs_fs.h:31,
                    from init/do_mounts.c:22:
   include/linux/swiotlb.h:100:22: error: static declaration of 'swiotlb_max_mapping_size' follows non-static declaration
    static inline size_t swiotlb_max_mapping_size(struct device *dev)
                         ^~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/swiotlb.h:65:8: note: previous declaration of 'swiotlb_max_mapping_size' was here
    size_t swiotlb_max_mapping_size(struct device *dev);
           ^~~~~~~~~~~~~~~~~~~~~~~~
>> include/linux/swiotlb.h:105:20: error: static declaration of 'is_swiotlb_active' follows non-static declaration
    static inline bool is_swiotlb_active(void)
                       ^~~~~~~~~~~~~~~~~
   include/linux/swiotlb.h:66:6: note: previous declaration of 'is_swiotlb_active' was here
    bool is_swiotlb_active(void);
         ^~~~~~~~~~~~~~~~~

vim +/is_swiotlb_active +105 include/linux/swiotlb.h

    76	
    77	bool swiotlb_map(struct device *dev, phys_addr_t *phys, dma_addr_t *dma_addr,
    78			size_t size, enum dma_data_direction dir, unsigned long attrs);
    79	void __init swiotlb_exit(void);
    80	unsigned int swiotlb_max_segment(void);
    81	#else
    82	#define swiotlb_force SWIOTLB_NO_FORCE
    83	static inline bool is_swiotlb_buffer(phys_addr_t paddr)
    84	{
    85		return false;
    86	}
    87	static inline bool swiotlb_map(struct device *dev, phys_addr_t *phys,
    88			dma_addr_t *dma_addr, size_t size, enum dma_data_direction dir,
    89			unsigned long attrs)
    90	{
    91		return false;
    92	}
    93	static inline void swiotlb_exit(void)
    94	{
    95	}
    96	static inline unsigned int swiotlb_max_segment(void)
    97	{
    98		return 0;
    99	}
 > 100	static inline size_t swiotlb_max_mapping_size(struct device *dev)
   101	{
   102		return SIZE_MAX;
   103	}
   104	
 > 105	static inline bool is_swiotlb_active(void)
   106	{
   107		return false;
   108	}
   109	#endif /* CONFIG_SWIOTLB */
   110	

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