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Use ASSERT_OK_FD to check the return value of join cgroup, or else this test will pass even if the fd < 0. ASSERT_OK_FD can print the error message to the console. Suggested-by: Martin KaFai Lau <martin.lau@kernel.org> Signed-off-by: Jason Xing <kerneljasonxing@gmail.com> Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org> Acked-by: Hou Tao <houtao1@huawei.com> Link: https://lore.kernel.org/all/6d62bd77-6733-40c7-b240-a1aeff55566c@linux.dev/ Link: https://patch.msgid.link/20250204051154.57655-1-kerneljasonxing@gmail.com
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.