mainline build failure due to 5cfd69775eb5 ("bcachefs: Array bounds fixes")

[Sudip Mukherjee (Codethink)]

Hi All,

The latest mainline kernel branch fails to build arm64 allmodconfig
with a native build on an arm64 host with the error:

In file included from fs/bcachefs/btree_io.c:11:
fs/bcachefs/btree_update_interior.h: In function 'want_new_bset':
fs/bcachefs/btree_update_interior.h:274:36: error: array subscript 0 is outside the bounds of an interior zero-length array 'struct bkey_packed[0]' [-Werror=zero-length-bounds]
  274 |   __bch_btree_u64s_remaining(c, b, &bne->keys.start[0]);
      |                                    ^~~~~~~~~~~~~~~~~~~
In file included from fs/bcachefs/bcachefs.h:206,
                 from fs/bcachefs/btree_io.c:3:
fs/bcachefs/bcachefs_format.h:2344:21: note: while referencing 'start'
 2344 |  struct bkey_packed start[0];
      |                     ^~~~~

git bisect pointed to 5cfd69775eb5 ("bcachefs: Array bounds fixes").

I will be happy to test any patch or provide any extra log if needed.

#regzbot introduced: 5cfd69775eb5460ef78bb5034a37eb0dc52ab65d

-- 
Regards
Sudip