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Martin KaFai Lau says: ==================== This patch introduces BPF Type Format (BTF). BTF (BPF Type Format) is the meta data format which describes the data types of BPF program/map. Hence, it basically focus on the C programming language which the modern BPF is primary using. The first use case is to provide a generic pretty print capability for a BPF map. A modified pahole that can convert dwarf to BTF is here: https://github.com/iamkafai/pahole/tree/btf Please see individual patch for details. v5: - Remove BTF_KIND_FLOAT and BTF_KIND_FUNC which are not currently used. They can be added in the future. Some bpf_df_xxx() are removed together. - Add comment in patch 7 to clarify that the new bpffs_map_fops should not be extended further. v4: - Fix warning (remove unneeded semicolon) - Remove a redundant variable (nr_bytes) from btf_int_check_meta() in patch 1. Caught by W=1. v3: - Rebase to bpf-next - Fix sparse warning (by adding static) - Add BTF header logging: btf_verifier_log_hdr() - Fix the alignment test on btf->type_off - Add tests for the BTF header - Lower the max BTF size to 16MB. It should be enough for some time. We could raise it later if it would be needed. v2: - Use kvfree where needed in patch 1 and 2 - Also consider BTF_INT_OFFSET() in the btf_int_check_meta() in patch 1 - Fix an incorrect goto target in map_create() during the btf-error-path in patch 7 - re-org some local vars to keep the rev xmas tree in btf.c ==================== Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> |
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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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.