Hi Nikolay,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on kdave/for-next]
[also build test WARNING on v5.8-rc5 next-20200715]
[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/Nikolay-Borisov/Convert-seed-devices-to-proper-list-API/20200715-185102
base:   https://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux.git for-next
config: x86_64-allyesconfig (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 02946de3802d3bc65bc9f2eb9b8d4969b5a7add8)
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 x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

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

All warnings (new ones prefixed by >>):

   In file included from fs/btrfs/volumes.c:17:
   fs/btrfs/ctree.h:2271:8: warning: 'const' type qualifier on return type has no effect [-Wignored-qualifiers]
   size_t __const btrfs_get_num_csums(void);
          ^~~~~~~~
   In file included from fs/btrfs/volumes.c:28:
   fs/btrfs/sysfs.h:16:14: warning: 'const' type qualifier on return type has no effect [-Wignored-qualifiers]
   const char * const btrfs_feature_set_name(enum btrfs_feature_set set);
                ^~~~~~
>> fs/btrfs/volumes.c:1029:6: warning: no previous prototype for function '__btrfs_free_extra_devids' [-Wmissing-prototypes]
   void __btrfs_free_extra_devids(struct btrfs_fs_devices *fs_devices, int step,
        ^
   fs/btrfs/volumes.c:1029:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void __btrfs_free_extra_devids(struct btrfs_fs_devices *fs_devices, int step,
   ^
   static 
   3 warnings generated.

vim +/__btrfs_free_extra_devids +1029 fs/btrfs/volumes.c

  1026	
  1027	
  1028	
> 1029	void __btrfs_free_extra_devids(struct btrfs_fs_devices *fs_devices, int step,
  1030				       struct btrfs_device **latest_dev)
  1031	{
  1032		struct btrfs_device *device, *next;
  1033	
  1034		/* This is the initialized path, it is safe to release the devices. */
  1035		list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) {
  1036			if (test_bit(BTRFS_DEV_STATE_IN_FS_METADATA,
  1037				     &device->dev_state)) {
  1038				if (!test_bit(BTRFS_DEV_STATE_REPLACE_TGT,
  1039					      &device->dev_state) &&
  1040				    !test_bit(BTRFS_DEV_STATE_MISSING,
  1041					      &device->dev_state) &&
  1042				    (!*latest_dev ||
  1043				     device->generation > (*latest_dev)->generation)) {
  1044					*latest_dev = device;
  1045				}
  1046				continue;
  1047			}
  1048	
  1049			if (device->devid == BTRFS_DEV_REPLACE_DEVID) {
  1050				/*
  1051				 * In the first step, keep the device which has
  1052				 * the correct fsid and the devid that is used
  1053				 * for the dev_replace procedure.
  1054				 * In the second step, the dev_replace state is
  1055				 * read from the device tree and it is known
  1056				 * whether the procedure is really active or
  1057				 * not, which means whether this device is
  1058				 * used or whether it should be removed.
  1059				 */
  1060				if (step == 0 || test_bit(BTRFS_DEV_STATE_REPLACE_TGT,
  1061							  &device->dev_state)) {
  1062					continue;
  1063				}
  1064			}
  1065			if (device->bdev) {
  1066				blkdev_put(device->bdev, device->mode);
  1067				device->bdev = NULL;
  1068				fs_devices->open_devices--;
  1069			}
  1070			if (test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) {
  1071				list_del_init(&device->dev_alloc_list);
  1072				clear_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state);
  1073				if (!test_bit(BTRFS_DEV_STATE_REPLACE_TGT,
  1074					      &device->dev_state))
  1075					fs_devices->rw_devices--;
  1076			}
  1077			list_del_init(&device->dev_list);
  1078			fs_devices->num_devices--;
  1079			btrfs_free_device(device);
  1080		}
  1081	

---
0-DAY CI Kernel Test Service, Intel Corporation
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