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Date: Thu, 10 Jul 2014 11:51:08 +0200 From: Alexei Starovoitov <ast@...mgrid.com> To: Will Deacon <will.deacon@....com> Cc: Zi Shen Lim <zlim.lnx@...il.com>, Catalin Marinas <Catalin.Marinas@....com>, "David S. Miller" <davem@...emloft.net>, Daniel Borkmann <dborkman@...hat.com>, Chema Gonzalez <chema@...gle.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, "netdev@...r.kernel.org" <netdev@...r.kernel.org> Subject: Re: [PATCH RFCv2] arm64: eBPF JIT compiler On Wed, Jul 9, 2014 at 3:00 PM, Will Deacon <will.deacon@....com> 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. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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