linux-kernel - Re: [PATCH bpf-next v9 9/9] selftests/bpf: Add tests to verify map create failure log

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Message-ID: <CAADnVQLXWQ8Miq2WBoXRDsEVP1QPwk=a5=Rj_uPN+9qKHZZmZw@mail.gmail.com>
Date: Wed, 4 Feb 2026 12:14:46 -0800
From: Alexei Starovoitov <alexei.starovoitov@...il.com>
To: Leon Hwang <leon.hwang@...ux.dev>
Cc: bpf <bpf@...r.kernel.org>, Alexei Starovoitov <ast@...nel.org>, 
	Daniel Borkmann <daniel@...earbox.net>, John Fastabend <john.fastabend@...il.com>, 
	Andrii Nakryiko <andrii@...nel.org>, Martin KaFai Lau <martin.lau@...ux.dev>, 
	Eduard Zingerman <eddyz87@...il.com>, Song Liu <song@...nel.org>, 
	Yonghong Song <yonghong.song@...ux.dev>, KP Singh <kpsingh@...nel.org>, 
	Stanislav Fomichev <sdf@...ichev.me>, Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>, 
	Shuah Khan <shuah@...nel.org>, Christian Brauner <brauner@...nel.org>, 
	Seth Forshee <sforshee@...nel.org>, Yuichiro Tsuji <yuichtsu@...zon.com>, 
	Andrey Albershteyn <aalbersh@...hat.com>, Willem de Bruijn <willemb@...gle.com>, 
	Jason Xing <kerneljasonxing@...il.com>, Tao Chen <chen.dylane@...ux.dev>, 
	Mykyta Yatsenko <yatsenko@...a.com>, Kumar Kartikeya Dwivedi <memxor@...il.com>, 
	Anton Protopopov <a.s.protopopov@...il.com>, Amery Hung <ameryhung@...il.com>, 
	Rong Tao <rongtao@...tc.cn>, LKML <linux-kernel@...r.kernel.org>, 
	Linux API <linux-api@...r.kernel.org>, 
	"open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@...r.kernel.org>, kernel-patches-bot@...com
Subject: Re: [PATCH bpf-next v9 9/9] selftests/bpf: Add tests to verify map
 create failure log

On Mon, Feb 2, 2026 at 6:43 AM Leon Hwang <leon.hwang@...ux.dev> wrote:
>
> +
> +#define BPF_LOG_FIXED  8
> +
> +static void test_map_create(enum bpf_map_type map_type, const char *map_name,
> +                           struct bpf_map_create_opts *opts, const char *exp_msg)
> +{
> +       const int key_size = 4, value_size = 4, max_entries = 1;
> +       char log_buf[128];
> +       int fd;
> +       LIBBPF_OPTS(bpf_log_opts, log_opts);
> +
> +       log_buf[0] = '\0';
> +       log_opts.log_buf = log_buf;
> +       log_opts.log_size = sizeof(log_buf);
> +       log_opts.log_level = BPF_LOG_FIXED;

Why? Which part of the test needs the log with this flag?