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| Filename | Latest commit message | Latest commit date |
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23127b33ec
The current btf_name_by_offset() is returning "(anon)" type name for the offset == 0 case and "(invalid-name-offset)" for the out-of-bound offset case. It fits well for the internal BTF verbose log purpose which is focusing on type. For example, offset == 0 => "(anon)" => anonymous type/name. Returning non-NULL for the bad offset case is needed during the BTF verification process because the BTF verifier may complain about another field first before discovering the name_off is invalid. However, it may not be ideal for the newer use case which does not necessary mean type name. For example, when logging line_info in the BPF verifier in the next patch, it is better to log an empty src line instead of logging "(anon)". The existing bpf_name_by_offset() is renamed to __bpf_name_by_offset() and static to btf.c. A new bpf_name_by_offset() is added for generic context usage. It returns "\0" for name_off == 0 (note that btf->strings[0] is "\0") and NULL for invalid offset. It allows the caller to decide what is the best output in its context. The new btf_name_by_offset() is overlapped with btf_name_offset_valid(). Hence, btf_name_offset_valid() is removed from btf.h to keep the btf.h API minimal. The existing btf_name_offset_valid() usage in btf.c could also be replaced later. Signed-off-by: Martin KaFai Lau <kafai@fb.com> Acked-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> |
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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.