From: kernel test robot <lkp(a)intel.com&gt; Zero-length and one-element arrays are deprecated, see Documentation/process/deprecated.rst Flexible-array members should be used instead. Generated by: scripts/coccinelle/misc/flexible_array.cocci CC: Kumar Kartikeya Dwivedi <memxor(a)gmail.com&gt; Reported-by: kernel test robot <lkp(a)intel.com&gt; Signed-off-by: kernel test robot <lkp(a)intel.com&gt; Signed-off-by: Julia Lawall <julia.lawall(a)inria.fr&gt; --- url: https://github.com/0day-ci/linux/commits/Kumar-Kartikeya-Dwivedi/Introduc... base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master :::::: branch date: 8 days ago :::::: commit date: 8 days ago Since this is a test, I don't know if you want to change it. test_run.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/net/bpf/test_run.c +++ b/net/bpf/test_run.c @@ -293,7 +293,7 @@ struct prog_test_fail2 { struct prog_test_fail3 { int len; char arr1[2]; - char arr2[0]; + char arr2[]; }; noinline void bpf_kfunc_call_test_pass_ctx(struct __sk_buff *skb)