netdev - Re: [PATCH net-next 1/9] bpf: add BPF

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Date:   Wed, 09 Aug 2017 09:55:53 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     daniel@...earbox.net
Cc:     ast@...com, holzheu@...ux.vnet.ibm.com,
        naveen.n.rao@...ux.vnet.ibm.com, jakub.kicinski@...ronome.com,
        netdev@...r.kernel.org
Subject: Re: [PATCH net-next 1/9] bpf: add BPF_J{LT,LE,SLT,SLE} instructions

From: Daniel Borkmann <daniel@...earbox.net>
Date: Wed,  9 Aug 2017 12:23:53 +0200

>   [1] https://github.com/borkmann/llvm/tree/bpf-insns

How is this "backwards compatible"?

If someone takes a new LLVM and tries to load those programs
into an older kernel they will be rejected.

There appears to be no effort to make things work cleanly in
that situation at all.