Re: [PATCH bpf-next v2] docs/bpf: add llvm_reloc.rst to explain llvm bpf relocations

[Yonghong Song <yhs@fb.com>]

sorry, please ignore this one. The same patch has been sent out last 
night. I may have accidentally deleted it from my inbox and didn't see 
it and so sent out again.

On 5/25/21 8:25 AM, Yonghong Song wrote:
> LLVM upstream commit https://reviews.llvm.org/D102712
> made some changes to bpf relocations to make them
> llvm linker lld friendly. The scope of
> existing relocations R_BPF_64_{64,32} is narrowed
> and new relocations R_BPF_64_{ABS32,ABS64,NODYLD32}
> are introduced.
> 
> Let us add some documentation about llvm bpf
> relocations so people can understand how to resolve
> them properly in their respective tools.
> 
> Cc: John Fastabend <john.fastabend@gmail.com>
> Cc: Lorenz Bauer <lmb@cloudflare.com>
> Signed-off-by: Yonghong Song <yhs@fb.com>
> ---
>   Documentation/bpf/index.rst            |   1 +
>   Documentation/bpf/llvm_reloc.rst       | 240 +++++++++++++++++++++++++
>   tools/testing/selftests/bpf/README.rst |  19 ++
>   3 files changed, 260 insertions(+)
>   create mode 100644 Documentation/bpf/llvm_reloc.rst
> 
> Changelogs:
>    v1 -> v2:
>      - add an example to illustrate how relocations related to base
>        section and symbol table and what is "Implicit Addend"
>      - clarify why we use 32bit read/write for R_BPF_64_64 (ld_imm64)
>        relocations.
> 
[...]