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Andrii Nakryiko says: ==================== This patch set adds support for reading bitfields in a relocatable manner through a set of relocations emitted by Clang, corresponding libbpf support for those relocations, as well as abstracting details into BPF_CORE_READ_BITFIELD/BPF_CORE_READ_BITFIELD_PROBED macro. We also add support for capturing relocatable field size, so that BPF program code can adjust its logic to actual amount of data it needs to operate on, even if it changes between kernels. New convenience macro is added to bpf_core_read.h (bpf_core_field_size(), in the same family of macro as bpf_core_read() and bpf_core_field_exists()). Corresponding set of selftests are added to excercise this logic and validate correctness in a variety of scenarios. Some of the overly strict logic of matching fields is relaxed to support wider variety of scenarios. See patch #1 for that. Patch #1 removes few overly strict test cases. Patch #2 adds support for bitfield-related relocations. Patch #3 adds some further adjustments to support generic field size relocations and introduces bpf_core_field_size() macro. Patch #4 tests bitfield reading. Patch #5 tests field size relocations. v1 -> v2: - added direct memory read-based macro and tests for bitfield reads. ==================== Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
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.