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Date: Tue, 10 Nov 2015 16:08:55 -0800
From: Eric Dumazet <eric.dumazet@...il.com>
To: Yang Shi <yang.shi@...aro.org>
Cc: ast@...nel.org, daniel@...earbox.net, catalin.marinas@....com,
will.deacon@....com, zlim.lnx@...il.com, xi.wang@...il.com,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linaro-kernel@...ts.linaro.org
Subject: Re: [PATCH 2/2] arm64: bpf: add BPF XADD instruction
On Tue, 2015-11-10 at 14:41 -0800, Yang Shi wrote:
> aarch64 doesn't have native support for XADD instruction, implement it by
> the below instruction sequence:
>
> Load (dst + off) to a register
> Add src to it
> Store it back to (dst + off)
Not really what is needed ?
See this BPF_XADD as an atomic_add() equivalent.
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