../kernel/trace/bpf_trace.c: In function ‘____bpf_trace_printk’:
../kernel/trace/bpf_trace.c:377:9: warning: function ‘____bpf_trace_printk’ might be a candidate for ‘gnu_printf’ format attribute [-Wsuggest-attribute=format]
  377 |         ret = bstr_printf(data.buf, MAX_BPRINTF_BUF, fmt, data.bin_args);
      |         ^~~
../kernel/trace/bpf_trace.c: In function ‘____bpf_trace_vprintk’:
../kernel/trace/bpf_trace.c:433:9: warning: function ‘____bpf_trace_vprintk’ might be a candidate for ‘gnu_printf’ format attribute [-Wsuggest-attribute=format]
  433 |         ret = bstr_printf(data.buf, MAX_BPRINTF_BUF, fmt, data.bin_args);
      |         ^~~
../kernel/trace/bpf_trace.c: In function ‘____bpf_seq_printf’:
../kernel/trace/bpf_trace.c:475:9: warning: function ‘____bpf_seq_printf’ might be a candidate for ‘gnu_printf’ format attribute [-Wsuggest-attribute=format]
  475 |         seq_bprintf(m, fmt, data.bin_args);
      |         ^~~~~~~~~~~
../kernel/bpf/bpf_local_storage.c: In function ‘bpf_selem_unlink’:
../kernel/bpf/bpf_local_storage.c:447:17: error: ‘return’ with no value, in function returning non-void [-Wreturn-mismatch]
  447 |                 return;
      |                 ^~~~~~
../kernel/bpf/bpf_local_storage.c:436:5: note: declared here
  436 | int bpf_selem_unlink(struct bpf_local_storage_elem *selem, bool reuse_now)
      |     ^~~~~~~~~~~~~~~~
../kernel/bpf/bpf_local_storage.c: In function ‘bpf_local_storage_destroy’:
../kernel/bpf/bpf_local_storage.c:780:13: warning: unused variable ‘err’ [-Wunused-variable]
  780 |         int err;
      |             ^~~
make[5]: *** [../scripts/Makefile.build:287: kernel/bpf/bpf_local_storage.o] Error 1
make[4]: *** [../scripts/Makefile.build:556: kernel/bpf] Error 2
make[4]: *** Waiting for unfinished jobs....
make[3]: *** [../scripts/Makefile.build:556: kernel] Error 2
make[2]: *** [/home/nipa/bpf-next/wt-0/Makefile:2011: .] Error 2
make[1]: *** [/home/nipa/bpf-next/wt-0/Makefile:248: __sub-make] Error 2
make: *** [Makefile:248: __sub-make] Error 2
../kernel/bpf/bpf_local_storage.c: In function ‘bpf_local_storage_destroy’:
../kernel/bpf/bpf_local_storage.c:801:13: warning: unused variable ‘err’ [-Wunused-variable]
  801 |         int err;
      |             ^~~
../kernel/trace/bpf_trace.c: In function ‘____bpf_trace_printk’:
../kernel/trace/bpf_trace.c:377:9: warning: function ‘____bpf_trace_printk’ might be a candidate for ‘gnu_printf’ format attribute [-Wsuggest-attribute=format]
  377 |         ret = bstr_printf(data.buf, MAX_BPRINTF_BUF, fmt, data.bin_args);
      |         ^~~
../kernel/trace/bpf_trace.c: In function ‘____bpf_trace_vprintk’:
../kernel/trace/bpf_trace.c:433:9: warning: function ‘____bpf_trace_vprintk’ might be a candidate for ‘gnu_printf’ format attribute [-Wsuggest-attribute=format]
  433 |         ret = bstr_printf(data.buf, MAX_BPRINTF_BUF, fmt, data.bin_args);
      |         ^~~
../kernel/trace/bpf_trace.c: In function ‘____bpf_seq_printf’:
../kernel/trace/bpf_trace.c:475:9: warning: function ‘____bpf_seq_printf’ might be a candidate for ‘gnu_printf’ format attribute [-Wsuggest-attribute=format]
  475 |         seq_bprintf(m, fmt, data.bin_args);
      |         ^~~~~~~~~~~