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.
Andrii Nakryiko
authored
During linking, type IDs in the resulting linked BPF object file can change, and so ldimm64 instructions corresponding to BPF_CORE_TYPE_ID_TARGET and BPF_CORE_TYPE_ID_LOCAL CO-RE relos can get their imm value out of sync with actual CO-RE relocation information that's updated by BPF linker properly during linking process. We could teach BPF linker to adjust such instructions, but it feels a bit too much for linker to re-implement good chunk of bpf_core_patch_insns logic just for this. This is a redundant safety check for TYPE_ID relocations, as the real validation is in matching CO-RE specs, so if that works fine, it's very unlikely that there is something wrong with the instruction itself. So, instead, teach libbpf (and kernel) to ignore insn->imm for BPF_CORE_TYPE_ID_TARGET and BPF_CORE_TYPE_ID_LOCAL relos. Signed-off-by:Andrii Nakryiko <andrii@kernel.org> Signed-off-by:
Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20211213010706.100231-1-andrii@kernel.org
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