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Yonghong Song says: ==================== Patch set [1] added rcu support for bpf programs. In [1], a rcu pointer is considered to be trusted and not null. This is actually not true in some cases. The rcu pointer could be null, and for non-null rcu pointer, it may have reference count of 0. This small patch set fixed this problem. Patch 1 is the kernel fix. Patch 2 adjusted selftests properly. Patch 3 added documentation for newly-introduced KF_RCU flag. [1] https://lore.kernel.org/all/20221124053201.2372298-1-yhs@fb.com/ Changelogs: v1 -> v2: - rcu ptr could be NULL. - non_null_rcu_ptr->rcu_field can be marked as MEM_RCU as well. - Adjust the code to avoid existing error message change. ==================== 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.