linux-kernel - Re: [PATCH] libbpf: Remove unnecessary conversion to bool

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Date:   Fri, 6 Nov 2020 13:32:43 -0800
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     xiakaixu1987@...il.com
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin Lau <kafai@...com>, Song Liu <songliubraving@...com>,
        Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Kaixu Xia <kaixuxia@...cent.com>
Subject: Re: [PATCH] libbpf: Remove unnecessary conversion to bool

On Thu, Nov 5, 2020 at 11:12 PM <xiakaixu1987@...il.com> wrote:
>
> From: Kaixu Xia <kaixuxia@...cent.com>
>
> Fix following warning from coccinelle:
>
> ./tools/lib/bpf/libbpf.c:1478:43-48: WARNING: conversion to bool not needed here
>
> Signed-off-by: Kaixu Xia <kaixuxia@...cent.com>
> ---
>  tools/lib/bpf/libbpf.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
> index 313034117070..fb9625077983 100644
> --- a/tools/lib/bpf/libbpf.c
> +++ b/tools/lib/bpf/libbpf.c
> @@ -1475,7 +1475,7 @@ static int set_kcfg_value_tri(struct extern_desc *ext, void *ext_val,
>                                 ext->name, value);
>                         return -EINVAL;
>                 }
> -               *(bool *)ext_val = value == 'y' ? true : false;
> +               *(bool *)ext_val = value == 'y';

I actually did this intentionally. x = y == z; pattern looked too
obscure to my taste, tbh.

>                 break;
>         case KCFG_TRISTATE:
>                 if (value == 'y')
> --
> 2.20.0
>