[PATCHv2] net: bpf: reject invalid shifts

On Tue, 2016-01-12 at 11:53 -0800, Alexei Starovoitov wrote:

On Tue, Jan 12, 2016 at 11:48:38AM -0800, Eric Dumazet wrote:

quoted

I believe we should add a one time warning to give a clue to poor users
hitting this problem.

you mean like warn_on_once() here?
Makes sense I guess.

pr_err(DEPRECATED, "%s (pid %d) "
                   "invalid shift in BPF program.\n"
                   current->comm, task_pid_nr(current));

Or something like that.