linux-kernel - Re: [PATCH 3/4] sparc: bpf_jit: Avoid assignment for "flen" if BPF JIT is disabled

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Date:   Sat, 03 Sep 2016 18:58:12 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     SF Markus Elfring <elfring@...rs.sourceforge.net>,
        sparclinux@...r.kernel.org,
        Adam Buchbinder <adam.buchbinder@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Rabin Vincent <rabin@....in>
CC:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        Julia Lawall <julia.lawall@...6.fr>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [PATCH 3/4] sparc: bpf_jit: Avoid assignment for "flen" if BPF
 JIT is disabled

On 09/03/2016 06:40 PM, SF Markus Elfring wrote:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Sat, 3 Sep 2016 18:00:03 +0200
>
> Move the assignment for the local variable "flen" a bit at the beginning
> so that it will only be performed if BPF JIT is enabled for this function.
>
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>

Why is that a particular issue (did you measure some improvement when
you say "fine-tuning" as per subject) ?

That's all not in critical path here by the way, same for patch 2.