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Emil Tsalapatis says: ==================== In BPF programs, kfunc calls while holding a lock are not allowed because kfuncs may sleep by default. The exception to this rule are the functions in special_kfunc_list, which are guaranteed to not sleep. The bpf_iter_num_* functions used by the bpf_for and bpf_repeat macros make no function calls themselves, and as such are guaranteed to not sleep. Add them to special_kfunc_list to allow them within BPF spinlock critical sections. Signed-off-by: Emil Tsalapatis (Meta) <emil@etsalapatis.com> ==================== Link: https://patch.msgid.link/20250104202528.882482-1-emil@etsalapatis.com 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 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.