linux-kernel - Re: [PATCH bpf-next v2 10/16] selftests/bpf: add bpf

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Date: Tue, 23 Apr 2024 19:56:42 -0700
From: Alexei Starovoitov <alexei.starovoitov@...il.com>
To: Benjamin Tissoires <bentiss@...nel.org>
Cc: Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, 
	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>, John Fastabend <john.fastabend@...il.com>, 
	KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...gle.com>, Hao Luo <haoluo@...gle.com>, 
	Jiri Olsa <jolsa@...nel.org>, Mykola Lysenko <mykolal@...com>, Shuah Khan <shuah@...nel.org>, 
	bpf <bpf@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, 
	"open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH bpf-next v2 10/16] selftests/bpf: add bpf_wq tests

On Sat, Apr 20, 2024 at 2:10 AM Benjamin Tissoires <bentiss@...nel.org> wrote:
>
> +
> +SEC("tc")
> +/* test that workqueues can be used from an array
> + */
> +__retval(0)
> +long test_call_array_sleepable(void *ctx)
> +{
> +       int key = 0;
> +
> +       return test_elem_callback(&array, &key);
> +}
> +
> +SEC("syscall")
> +/* Same test than above but from a sleepable context.
> + */

I adjusted all these comments to be normal single line comments.

The main thing to follow up is to figure out how to wait for wq
to finish.
Since we have this message:
/test_progs -t wq
..
#521     wq:OK
Summary: 2/9 PASSED, 0 SKIPPED, 0 FAILED
Failed to unload bpf_testmod.ko from kernel: -11

and doing manual "rmmod bpf_testmod"
after the test run is quite annoying.

Overall great stuff. Thank you for pushing it through.
Much appreciated!