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Date:	Wed, 13 Aug 2014 14:16:35 -0700
From:	"H. Peter Anvin" <>
To:	Alexei Starovoitov <>,
	Andy Lutomirski <>
CC:	"David S. Miller" <>,
	Ingo Molnar <>,
	Linus Torvalds <>,
	Steven Rostedt <>,
	Daniel Borkmann <>,
	Chema Gonzalez <>,
	Eric Dumazet <>,
	Peter Zijlstra <>,
	Andrew Morton <>,
	Kees Cook <>,
	Linux API <>,
	Network Development <>,
	"" <>
Subject: Re: [PATCH RFC v4 net-next 01/26] net: filter: add "load 64-bit immediate"
 eBPF instruction

On 08/13/2014 02:02 PM, Alexei Starovoitov wrote:
> On Wed, Aug 13, 2014 at 11:35 AM, Andy Lutomirski <> wrote:
>> The compiler can still think of it as a single insn, though, but some
>> future compiler might not.
> I think that would be very dangerous.
> compiler (user space) and kernel interpreter must have the same
> understanding of ISA.

Only at the point of the interface layer.  The compiler can treat it as
a single instruction internally, the JIT can do peephole optimization,
but as long as the instruction stream at the boundary matches the
official ISA spec everything is fine.


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