Re: [PATCH v10 1/9] dax: Introduce holder for dax_device

[kernel test robot <lkp@xxxxxxxxx>]

Hi Shiyang,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linux/master]
[also build test WARNING on linus/master v5.17-rc1 next-20220127]
[cannot apply to xfs-linux/for-next]
[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]

url:    https://github.com/0day-ci/linux/commits/Shiyang-Ruan/fsdax-introduce-fs-query-to-support-reflink/20220127-204239
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 2c271fe77d52a0555161926c232cd5bc07178b39
config: arm-imx_v4_v5_defconfig (https://download.01.org/0day-ci/archive/20220128/202201280053.mWAlT70p-lkp@xxxxxxxxx/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project f32dccb9a43b02ce4e540d6ba5dbbdb188f2dc7d)
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
        # install arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://github.com/0day-ci/linux/commit/57669ed05e93b37d995c5247eebe218ab2058c9a
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Shiyang-Ruan/fsdax-introduce-fs-query-to-support-reflink/20220127-204239
        git checkout 57669ed05e93b37d995c5247eebe218ab2058c9a
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash fs/iomap/

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

All warnings (new ones prefixed by >>):

   In file included from fs/iomap/buffered-io.c:13:
>> include/linux/dax.h:73:16: warning: declaration of 'struct dax_holder_operations' will not be visible outside of this function [-Wvisibility]
                   const struct dax_holder_operations *ops)
                                ^
   1 warning generated.


vim +73 include/linux/dax.h

    48	
    49	void dax_register_holder(struct dax_device *dax_dev, void *holder,
    50			const struct dax_holder_operations *ops);
    51	void dax_unregister_holder(struct dax_device *dax_dev);
    52	void *dax_get_holder(struct dax_device *dax_dev);
    53	void put_dax(struct dax_device *dax_dev);
    54	void kill_dax(struct dax_device *dax_dev);
    55	void dax_write_cache(struct dax_device *dax_dev, bool wc);
    56	bool dax_write_cache_enabled(struct dax_device *dax_dev);
    57	bool dax_synchronous(struct dax_device *dax_dev);
    58	void set_dax_synchronous(struct dax_device *dax_dev);
    59	/*
    60	 * Check if given mapping is supported by the file / underlying device.
    61	 */
    62	static inline bool daxdev_mapping_supported(struct vm_area_struct *vma,
    63						     struct dax_device *dax_dev)
    64	{
    65		if (!(vma->vm_flags & VM_SYNC))
    66			return true;
    67		if (!IS_DAX(file_inode(vma->vm_file)))
    68			return false;
    69		return dax_synchronous(dax_dev);
    70	}
    71	#else
    72	static inline void dax_register_holder(struct dax_device *dax_dev, void *holder,
  > 73			const struct dax_holder_operations *ops)
    74	{
    75	}
    76	static inline void dax_unregister_holder(struct dax_device *dax_dev)
    77	{
    78	}
    79	static inline void *dax_get_holder(struct dax_device *dax_dev)
    80	{
    81		return NULL;
    82	}
    83	static inline struct dax_device *alloc_dax(void *private,
    84			const struct dax_operations *ops)
    85	{
    86		/*
    87		 * Callers should check IS_ENABLED(CONFIG_DAX) to know if this
    88		 * NULL is an error or expected.
    89		 */
    90		return NULL;
    91	}
    92	static inline void put_dax(struct dax_device *dax_dev)
    93	{
    94	}
    95	static inline void kill_dax(struct dax_device *dax_dev)
    96	{
    97	}
    98	static inline void dax_write_cache(struct dax_device *dax_dev, bool wc)
    99	{
   100	}
   101	static inline bool dax_write_cache_enabled(struct dax_device *dax_dev)
   102	{
   103		return false;
   104	}
   105	static inline bool dax_synchronous(struct dax_device *dax_dev)
   106	{
   107		return true;
   108	}
   109	static inline void set_dax_synchronous(struct dax_device *dax_dev)
   110	{
   111	}
   112	static inline bool daxdev_mapping_supported(struct vm_area_struct *vma,
   113					struct dax_device *dax_dev)
   114	{
   115		return !(vma->vm_flags & VM_SYNC);
   116	}
   117	#endif
   118	

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