netdev - Re: [PATCH] x86: bpf_jit_comp: simplify trivial boolean return

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Message-ID: <CAADnVQK8mn4ZHwbhBArosEw3Bmsc5vJfOzAeRE3R_1S7dbNfkg@mail.gmail.com>
Date:	Wed, 26 Nov 2014 08:42:09 -0800
From:	Alexei Starovoitov <alexei.starovoitov@...il.com>
To:	Quentin Lambert <lambert.quentin@...il.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: bpf_jit_comp: simplify trivial boolean return

On Wed, Nov 26, 2014 at 1:18 AM, Quentin Lambert
<lambert.quentin@...il.com> wrote:
> Remove if then else statements preceding
> boolean return. Occurences were found using
> Coccinelle.
>
> The semantic patch used was:
>
> @@
> expression expr;
> @@
>
>
> - if ( expr )
> -       return true;
> - else
> -       return false;
> + return expr;
>
> Signed-off-by: Quentin Lambert <lambert.quentin@...il.com>
>
> ---
>  arch/x86/net/bpf_jit_comp.c |    8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
>
> diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
> index 3f62734..1542f39 100644
> --- a/arch/x86/net/bpf_jit_comp.c
> +++ b/arch/x86/net/bpf_jit_comp.c
> @@ -135,11 +135,9 @@ static const int reg2hex[] = {
>   */
>  static inline bool is_ereg(u32 reg)
>  {
> -       if (reg == BPF_REG_5 || reg == AUX_REG ||
> -           (reg >= BPF_REG_7 && reg <= BPF_REG_9))
> -               return true;
> -       else
> -               return false;
> +       return (reg == BPF_REG_5 ||
> +               reg == AUX_REG ||
> +               (reg >= BPF_REG_7 && reg <= BPF_REG_9));

please remove extra () around the whole expression, and
align in properly, and
don't move reg==AUX_REG check to a different line.
Subject is not warranted. I don't think it's a simplification.
imo existing code is fine and I don't think the time spent
reviewing such changes is worth it when there is no
improvement in readability.
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