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Andrii Nakryiko says: ==================== This patch set implements central part of CO-RE (Compile Once - Run Everywhere, see [0] and [1] for slides and video): relocating fields offsets. Most of the details are written down as comments to corresponding parts of the code. Patch #1 adds a bunch of commonly useful btf_xxx helpers to simplify working with BTF types. Patch #2 converts existing libbpf code to these new helpers and removes some of pre-existing ones. Patch #3 adds loading of .BTF.ext offset relocations section and macros to work with its contents. Patch #4 implements CO-RE relocations algorithm in libbpf. Patch #5 introduced BPF_CORE_READ macro, hiding usage of Clang's __builtin_preserve_access_index intrinsic that records offset relocation. Patches #6-#14 adds selftests validating various parts of relocation handling, type compatibility, etc. For all tests to work, you'll need latest Clang/LLVM supporting __builtin_preserve_access_index intrinsic, used for recording offset relocations. Kernel on which selftests run should have BTF information built in (CONFIG_DEBUG_INFO_BTF=y). [0] http://vger.kernel.org/bpfconf2019.html#session-2 [1] http://vger.kernel.org/lpc-bpf2018.html#session-2 v5->v6: - fix bad comment formatting for real (Alexei); v4->v5: - drop constness for btf_xxx() helpers, allowing to avoid type casts (Alexei); - rebase on latest bpf-next, change test__printf back to printf; v3->v4: - added btf_xxx helpers (Alexei); - switched libbpf code to new helpers; - reduced amount of logging and simplified format in few places (Alexei); - made flavor name parsing logic more strict (exactly three underscores); - no uname() error checking (Alexei); - updated misc tests to reflect latest Clang fixes (Yonghong); v2->v3: - enclose BPF_CORE_READ args in parens (Song); v1->v2: - add offsetofend(), fix btf_ext optional fields checks (Song); - add bpf_core_dump_spec() for logging spec representation; - move special first element processing out of the loop (Song); - typo fixes (Song); - drop BPF_ST | BPF_MEM insn relocation (Alexei); - extracted BPF_CORE_READ into bpf_helpers (Alexei); - added extra tests validating Clang capturing relocs correctly (Yonghong); - switch core_relocs.c to use sub-tests; - updated mods tests after Clang bug was fixed (Yonghong); - fix bug enumerating candidate types; ==================== Signed-off-by: Alexei Starovoitov <ast@kernel.org> |
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| README | ||
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.