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After the V!=R rework (commit c98d2ecae0 ("s390/mm: Uncouple physical
vs virtual address spaces")), all kernel code and related data are
allocated within a 4G region, making it possible to use relative
addressing in BPF code more extensively.
Convert as many indirect calls and jumps to direct calls as possible,
namely:
* BPF_CALL
* __bpf_tramp_enter()
* __bpf_tramp_exit()
* __bpf_prog_enter()
* __bpf_prog_exit()
* fentry
* fmod_ret
* fexit
* BPF_TRAMP_F_CALL_ORIG without BPF_TRAMP_F_ORIG_STACK
* Trampoline returns without BPF_TRAMP_F_SKIP_FRAME and
BPF_TRAMP_F_ORIG_STACK
The following indirect calls and jumps remain:
* Prog returns
* Trampoline returns with BPF_TRAMP_F_SKIP_FRAME or
BPF_TRAMP_F_ORIG_STACK
* BPF_TAIL_CALL
* BPF_TRAMP_F_CALL_ORIG with BPF_TRAMP_F_ORIG_STACK
As a result, only one usage of call_r1() remains, so inline it.
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20250819102116.252203-1-iii@linux.ibm.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 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.