Re: [PATCH RFC v4 net-next 17/26] tracing: allow eBPF programs to be attached to events

On Aug 15, 2014 10:36 AM, "Alexei Starovoitov" [off-list ref] wrote:

On Fri, Aug 15, 2014 at 10:20 AM, Andy Lutomirski [off-list ref] wrote:

quoted

The downside of this approach is that compat support might be
difficult or impossible.

Would do you mean by compat? 32-bit programs on 64-bit kernels?
There is no such concept for eBPF. All eBPF programs are always
operating on 64-bit registers.

Doesn't the eBPF program need to know sizeof(long) to read these
fields correctly?  Or am I misunderstanding what the code does?

--Andy