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Date:	Thu, 10 Jul 2014 11:51:08 +0200
From:	Alexei Starovoitov <>
To:	Will Deacon <>
Cc:	Zi Shen Lim <>,
	Catalin Marinas <>,
	"David S. Miller" <>,
	Daniel Borkmann <>,
	Chema Gonzalez <>,
	"" <>,
	"" <>
Subject: Re: [PATCH RFCv2] arm64: eBPF JIT compiler

On Wed, Jul 9, 2014 at 3:00 PM, Will Deacon <> wrote:
> On Tue, Jul 08, 2014 at 08:06:53AM +0100, Zi Shen Lim wrote:
>> 1. Implement remaining classes of eBPF instructions: ST|MEM, STX|XADD
>>    which currently do not have corresponding test cases in test_bpf.
> I can help out with atomics, if you need it. Are the memory barrier
> semantics well-defined for eBPF?

There are no barrier or cmpxchg instructions in eBPF, since such use case
doesn't exist yet. There is only xadd that is equivalent to atomic_add
which can be JITed as exclusive load/store on arm64.
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