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Kumar Kartikeya Dwivedi says: ==================== Transfer RCU lock state across subprog calls David suggested during the discussion in [0] that we should handle RCU locks in a similar fashion to spin locks where the verifier understands when a lock held in a caller is released in callee, or lock taken in callee is released in a caller, or the callee is called within a lock critical section. This set extends the same semantics to RCU read locks and adds a few selftests to verify correct behavior. This issue has also come up for sched-ext programs. This would now allow static subprog calls to be made without errors within RCU read sections, for subprogs to release RCU locks of callers and return to them, or for subprogs to take RCU lock which is later released in the caller. [0]: https://lore.kernel.org/bpf/20240204120206.796412-1-memxor@gmail.com Changelog: ---------- v1 -> v2: v1: https://lore.kernel.org/bpf/20240204230231.1013964-1-memxor@gmail.com * Add tests for global subprog behaviour (Yafang) * Add Acks, Tested-by (Yonghong, Yafang) ==================== Link: https://lore.kernel.org/r/20240205055646.1112186-1-memxor@gmail.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 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.