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Subject: Re: [PATCH bpf 0/2] bpf, arm: Small JIT optimizations
To:     Luke Nelson <lukenels@cs.washington.edu>, bpf@vger.kernel.org
Cc:     Luke Nelson <luke.r.nels@gmail.com>,
        Shubham Bansal <illusionist.neo@gmail.com>,
        Russell King <linux@armlinux.org.uk>,
        Alexei Starovoitov <ast@kernel.org>,
        Martin KaFai Lau <kafai@fb.com>,
        Song Liu <songliubraving@fb.com>, Yonghong Song <yhs@fb.com>,
        Andrii Nakryiko <andriin@fb.com>,
        John Fastabend <john.fastabend@gmail.com>,
        KP Singh <kpsingh@chromium.org>, netdev@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
References: <20200501020210.32294-1-luke.r.nels@gmail.com>
From:   Daniel Borkmann <daniel@iogearbox.net>
Message-ID: <c59f4067-6334-2dc4-a37b-b1e953663897@iogearbox.net>
Date:   Mon, 4 May 2020 18:05:01 +0200
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On 5/1/20 4:02 AM, Luke Nelson wrote:
> As Daniel suggested to us, we ran our formal verification tool, Serval,
> over the arm JIT. The bugs we found have been patched and applied to the
> bpf tree [1, 2]. This patch series introduces two small optimizations
> that simplify the JIT and use fewer instructions.
> 
> [1] https://lore.kernel.org/bpf/20200408181229.10909-1-luke.r.nels@gmail.com/
> [2] https://lore.kernel.org/bpf/20200409221752.28448-1-luke.r.nels@gmail.com/
> 
> Luke Nelson (2):
>    bpf, arm: Optimize emit_a32_arsh_r64 using conditional instruction
>    bpf, arm: Optimize ALU ARSH K using asr immediate instruction
> 
>   arch/arm/net/bpf_jit_32.c | 14 +++++++++-----
>   arch/arm/net/bpf_jit_32.h |  2 ++
>   2 files changed, 11 insertions(+), 5 deletions(-)
> 

Applied, thanks!