Hi Vivek,

I love your patch! Perhaps something to improve:

[auto build test WARNING on fuse/for-next]
[also build test WARNING on v4.20-rc6]
[cannot apply to next-20181210]
[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: arm-allmodconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (Debian 7.2.0-11) 7.2.0
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=7.2.0 make.cross ARCH=arm 

All warnings (new ones prefixed by >>):

   In file included from include/linux/kernel.h:14:0,
                    from include/linux/list.h:9,
                    from include/linux/wait.h:7,
                    from include/linux/wait_bit.h:8,
                    from include/linux/fs.h:6,
                    from fs/fuse/virtio_fs.c:7:
   fs/fuse/virtio_fs.c: In function 'virtio_fs_direct_access':
>> fs/fuse/virtio_fs.c:454:11: warning: format '%ld' expects argument of type 'long int', but argument 4 has type 'size_t {aka unsigned int}' [-Wformat=]
     pr_debug("virtio_fs_direct_access(): called. nr_pages=%ld max_nr_pages=%ld\n", nr_pages, max_nr_pages);
              ^
   include/linux/printk.h:292:21: note: in definition of macro 'pr_fmt'
    #define pr_fmt(fmt) fmt
                        ^~~
   include/linux/printk.h:340:2: note: in expansion of macro 'dynamic_pr_debug'
     dynamic_pr_debug(fmt, ##__VA_ARGS__)
     ^~~~~~~~~~~~~~~~
>> fs/fuse/virtio_fs.c:454:2: note: in expansion of macro 'pr_debug'
     pr_debug("virtio_fs_direct_access(): called. nr_pages=%ld max_nr_pages=%ld\n", nr_pages, max_nr_pages);
     ^~~~~~~~
   In file included from include/linux/printk.h:336:0,
                    from include/linux/kernel.h:14,
                    from include/linux/list.h:9,
                    from include/linux/wait.h:7,
                    from include/linux/wait_bit.h:8,
                    from include/linux/fs.h:6,
                    from fs/fuse/virtio_fs.c:7:
   fs/fuse/virtio_fs.c: In function 'virtio_fs_setup_dax':
   fs/fuse/virtio_fs.c:617:22: warning: format '%llx' expects argument of type 'long long unsigned int', but argument 6 has type 'phys_addr_t {aka unsigned int}' [-Wformat=]
     dev_dbg(&vdev->dev, "%s: cache kaddr 0x%px phys_addr 0x%llx len %llx\n",
                         ^
   include/linux/dynamic_debug.h:135:39: note: in definition of macro 'dynamic_dev_dbg'
      __dynamic_dev_dbg(&descriptor, dev, fmt, \
                                          ^~~
   include/linux/device.h:1463:23: note: in expansion of macro 'dev_fmt'
     dynamic_dev_dbg(dev, dev_fmt(fmt), ##__VA_ARGS__)
                          ^~~~~~~
   fs/fuse/virtio_fs.c:617:2: note: in expansion of macro 'dev_dbg'
     dev_dbg(&vdev->dev, "%s: cache kaddr 0x%px phys_addr 0x%llx len %llx\n",
     ^~~~~~~

vim +454 fs/fuse/virtio_fs.c

   442	
   443	/* Map a window offset to a page frame number.  The window offset will have
   444	 * been produced by .iomap_begin(), which maps a file offset to a window
   445	 * offset.
   446	 */
   447	static long virtio_fs_direct_access(struct dax_device *dax_dev, pgoff_t pgoff,
   448					    long nr_pages, void **kaddr, pfn_t *pfn)
   449	{
   450		struct virtio_fs *fs = dax_get_private(dax_dev);
   451		phys_addr_t offset = PFN_PHYS(pgoff);
   452		size_t max_nr_pages = fs->window_len/PAGE_SIZE - pgoff;
   453	
 > 454		pr_debug("virtio_fs_direct_access(): called. nr_pages=%ld max_nr_pages=%ld\n", nr_pages, max_nr_pages);
   455	
   456		if (kaddr)
   457			*kaddr = fs->window_kaddr + offset;
   458		if (pfn)
   459			*pfn = phys_to_pfn_t(fs->window_phys_addr + offset,
   460						PFN_DEV | PFN_MAP);
   461		return nr_pages > max_nr_pages ? max_nr_pages : nr_pages;
   462	}
   463	

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