https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109215
Bug ID: 109215
Summary: warning: array subscript 0 is outside the bounds of an
interior zero-length array ‘struct lock_class_key[3]’
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: ubizjak at gmail dot com
Target Milestone: ---
The linux kernel compile fails with gcc-13 in super.c with:
fs/super.c: In function ‘alloc_super.isra’:
fs/super.c:234:21: error: array subscript 2 is outside the bounds of an
interior zero-length array ‘struct lock_class_key[3]’
[-Werror=zero-length-bounds]
234 | if (__percpu_init_rwsem(&s->s_writers.rw_sem[i],
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
235 | sb_writers_name[i],
| ~~~~~~~~~~~~~~~~~~~
236 | &type->s_writers_key[i]))
| ~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ./include/linux/highmem.h:5,
from ./include/linux/bvec.h:10,
from ./include/linux/blk_types.h:10,
from ./include/linux/blkdev.h:9,
from fs/super.c:26:
./include/linux/fs.h:2211:31: note: while referencing ‘s_writers_key’
2211 | struct lock_class_key s_writers_key[SB_FREEZE_LEVELS];
| ^~~~~~~~~~~~~
cc1: all warnings being treated as errors
