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bf7ce5416f
Generate __attribute__((bpf_fastcall)) for kfuncs marked with
"bpf_fastcall" decl tag. E.g. for the following BTF:
$ bpftool btf dump file vmlinux
...
[A] FUNC 'bpf_rdonly_cast' type_id=...
...
[B] DECL_TAG 'bpf_kfunc' type_id=A component_idx=-1
[C] DECL_TAG 'bpf_fastcall' type_id=A component_idx=-1
Generate the following vmlinux.h:
#ifndef __VMLINUX_H__
#define __VMLINUX_H__
...
#ifndef __bpf_fastcall
#if __has_attribute(bpf_fastcall)
#define __bpf_fastcall __attribute__((bpf_fastcall))
#else
#define __bpf_fastcall
#endif
#endif
...
__bpf_fastcall extern void *bpf_rdonly_cast(...) ...;
The "bpf_fastcall" / "bpf_kfunc" tags pair would generated by pahole
when constructing vmlinux BTF.
While at it, sort printed kfuncs by name for better vmlinux.h
stability.
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20240916091712.2929279-5-eddyz87@gmail.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 reStructuredText 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.