linux-kernel - Re: [PATCH bpf v4 2/2] selftests/bpf: add regression test for bpf_d

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Message-ID: <CAPhsuW7NTGkbVD97DQddwPEQR6PZgYQJ6c-JcEsNUg6ddnh3rA@mail.gmail.com>
Date: Thu, 4 Dec 2025 15:47:15 -0800
From: Song Liu <song@...nel.org>
To: Shuran Liu <electronlsr@...il.com>
Cc: mattbobrowski@...gle.com, bpf@...r.kernel.org, ast@...nel.org, 
	daniel@...earbox.net, andrii@...nel.org, martin.lau@...ux.dev, 
	eddyz87@...il.com, yonghong.song@...ux.dev, john.fastabend@...il.com, 
	kpsingh@...nel.org, sdf@...ichev.me, haoluo@...gle.com, jolsa@...nel.org, 
	rostedt@...dmis.org, mhiramat@...nel.org, mathieu.desnoyers@...icios.com, 
	linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org, 
	dxu@...uu.xyz, linux-kselftest@...r.kernel.org, shuah@...nel.org
Subject: Re: [PATCH bpf v4 2/2] selftests/bpf: add regression test for bpf_d_path()

On Thu, Dec 4, 2025 at 4:39 AM Shuran Liu <electronlsr@...il.com> wrote:
>
> Hi,
>
> I looked into the CI failure and it’s caused by the test assuming
> /tmp is on tmpfs, which is not true in the CI environment, so
> fallocate() fails there. Since /dev/shm is mounted as tmpfs on that
> setup, would it be acceptable to change the test to use a file under
> /dev/shm instead of /tmp?

You can use mkstemp. There are a few examples in prog_tests.

Thanks,
Song