btrfs: Fix build error while LIBCRC32C is module

If CONFIG_BTRFS_FS is y and CONFIG_LIBCRC32C is m,
building fails:

  fs/btrfs/super.o: In function `btrfs_mount_root':
  super.c:(.text+0xb7f9): undefined reference to `crc32c_impl'
  fs/btrfs/super.o: In function `init_btrfs_fs':
  super.c:(.init.text+0x3465): undefined reference to `crc32c_impl'
  fs/btrfs/extent-tree.o: In function `hash_extent_data_ref':
  extent-tree.c:(.text+0xe60): undefined reference to `crc32c'
  extent-tree.c:(.text+0xe78): undefined reference to `crc32c'
  extent-tree.c:(.text+0xe8b): undefined reference to `crc32c'
  fs/btrfs/dir-item.o: In function `btrfs_insert_xattr_item':
  dir-item.c:(.text+0x291): undefined reference to `crc32c'
  fs/btrfs/dir-item.o: In function `btrfs_insert_dir_item':
  dir-item.c:(.text+0x429): undefined reference to `crc32c'

Select LIBCRC32C to fix it.

Reported-by: Hulk Robot <hulkci@huawei.com>
Fixes: d5178578bcd4 ("btrfs: directly call into crypto framework for checksumming")
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/Kconfig b/fs/btrfs/Kconfig
index 212b4a8..38651fa 100644 (file)
--- a/fs/btrfs/Kconfig
+++ b/fs/btrfs/Kconfig
@@ -4,6 +4,7 @@ config BTRFS_FS
        tristate "Btrfs filesystem support"
        select CRYPTO
        select CRYPTO_CRC32C
+       select LIBCRC32C
        select ZLIB_INFLATE
        select ZLIB_DEFLATE
        select LZO_COMPRESS