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Andrii Nakryiko says: ==================== This patch set adds new BPF link operation, LINK_DETACH, allowing processes with BPF link FD to force-detach it from respective BPF hook, similarly how BPF link is auto-detached when such BPF hook (e.g., cgroup, net_device, netns, etc) is removed. This facility allows admin to forcefully undo BPF link attachment, while process that created BPF link in the first place is left intact. Once force-detached, BPF link stays valid in the kernel as long as there is at least one FD open against it. It goes into defunct state, just like auto-detached BPF link. bpftool also got `link detach` command to allow triggering this in non-programmatic fashion. v1->v2: - improve error reporting in `bpftool link detach` (Song). ==================== Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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 Restructured Text 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.