erofs: add __packed annotation to union(__le16..)

I'm unsure why they aren't 2 bytes in size only in arm-linux-gnueabi.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/r/202504051202.DS7QIknJ-lkp@intel.com
Fixes: 61ba89b57905 ("erofs: add 48-bit block addressing on-disk support")
Fixes: efb2aef569b3 ("erofs: add encoded extent on-disk definition")
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20250408114448.4040220-1-hsiangkao@linux.alibaba.com

diff --git a/fs/erofs/erofs_fs.h b/fs/erofs/erofs_fs.h
index 9581e9bf8192dc753a3aeb52fcca96ec4d4bdf80..767fb4acdc93a82cf03aab8e7597e0feca6c124e 100644 (file)
--- a/fs/erofs/erofs_fs.h
+++ b/fs/erofs/erofs_fs.h
@@ -56,7 +56,7 @@ struct erofs_super_block {
        union {
                __le16 rootnid_2b;      /* nid of root directory */
                __le16 blocks_hi;       /* (48BIT on) blocks count MSB */
-       } rb;
+       } __packed rb;
        __le64 inos;            /* total valid ino # (== f_files - f_favail) */
        __le64 epoch;           /* base seconds used for compact inodes */
        __le32 fixed_nsec;      /* fixed nanoseconds for compact inodes */
@@ -148,7 +148,7 @@ union erofs_inode_i_nb {
        __le16 nlink;           /* if EROFS_I_NLINK_1_BIT is unset */
        __le16 blocks_hi;       /* total blocks count MSB */
        __le16 startblk_hi;     /* starting block number MSB */
-};
+} __packed;
 
 /* 32-byte reduced form of an ondisk inode */
 struct erofs_inode_compact {
@@ -369,9 +369,9 @@ struct z_erofs_map_header {
                         * bit 7   : pack the whole file into packed inode
                         */
                        __u8    h_clusterbits;
-               };
+               } __packed;
                __le16 h_extents_hi;    /* extent count MSB */
-       };
+       } __packed;
 };
 
 enum {