Hi Vivek,

I love your patch! Yet something to improve:

[auto build test ERROR on fuse/for-next]
[also build test ERROR on v4.20-rc6]
[cannot apply to next-20181214]
[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/Vivek-Goyal/virtio-fs-shared-file-system-for-virtual-machines/20181211-103034
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse.git for-next
config: nds32-defconfig (attached as .config)
compiler: nds32le-linux-gcc (GCC) 6.4.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=6.4.0 make.cross ARCH=nds32 

All errors (new ones prefixed by >>):

   fs/fuse/inode.o: In function `fuse_fill_super_common':
>> inode.c:(.text+0x1c00): undefined reference to `dax_read_lock'
   inode.c:(.text+0x1c04): undefined reference to `dax_read_lock'
>> inode.c:(.text+0x1c22): undefined reference to `dax_direct_access'
   inode.c:(.text+0x1c26): undefined reference to `dax_direct_access'
>> inode.c:(.text+0x1c32): undefined reference to `dax_read_unlock'
   inode.c:(.text+0x1c36): undefined reference to `dax_read_unlock'

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