-Wflex-array-member-not-at-end was introduced in GCC-14, and we are getting ready to enable it, globally.
Use the new TRAILING_OVERLAP() helper to fix the following warning: fs/ocfs2/xattr.c:52:41: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end] This helper creates a union between a flexible-array member (FAM) and a set of MEMBERS that would otherwise follow it. This overlays the trailing MEMBER struct ocfs2_extent_rec er; onto the FAM struct ocfs2_xattr_value_root::xr_list.l_recs[], while keeping the FAM and the start of MEMBER aligned. The static_assert() ensures this alignment remains, and it's intentionally placed inmediately after the related structure --no blank line in between. Signed-off-by: Gustavo A. R. Silva <[email protected]> --- fs/ocfs2/xattr.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/fs/ocfs2/xattr.c b/fs/ocfs2/xattr.c index d70a20d29e3e..09069defd7e1 100644 --- a/fs/ocfs2/xattr.c +++ b/fs/ocfs2/xattr.c @@ -49,9 +49,13 @@ #include "ocfs2_trace.h" struct ocfs2_xattr_def_value_root { - struct ocfs2_xattr_value_root xv; - struct ocfs2_extent_rec er; + /* Must be last as it ends in a flexible-array member. */ + TRAILING_OVERLAP(struct ocfs2_xattr_value_root, xv, xr_list.l_recs, + struct ocfs2_extent_rec er; + ); }; +static_assert(offsetof(struct ocfs2_xattr_def_value_root, xv.xr_list.l_recs) == + offsetof(struct ocfs2_xattr_def_value_root, er)); struct ocfs2_xattr_bucket { /* The inode these xattrs are associated with */ -- 2.43.0
