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d9ab2f76ef
Enforce the following existing limitation on struct_ops programs based
on kernel BTF id instead of program-local BTF id:
struct_ops BPF prog can be re-used between multiple .struct_ops &
.struct_ops.link as long as it's the same struct_ops struct
definition and the same function pointer field
This allows reusing same BPF program for versioned struct_ops map
definitions, e.g.:
SEC("struct_ops/test")
int BPF_PROG(foo) { ... }
struct some_ops___v1 { int (*test)(void); };
struct some_ops___v2 { int (*test)(void); };
SEC(".struct_ops.link") struct some_ops___v1 a = { .test = foo }
SEC(".struct_ops.link") struct some_ops___v2 b = { .test = foo }
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20240306104529.6453-3-eddyz87@gmail.com
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.