mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-07-14 21:43:02 +02:00
Hengqi ChenandGreg Kroah-Hartman
7cf8fe2b2b
commit52266f1015upstream. Vincent reported that running XDP synproxy program on LoongArch results in the following error: JIT doesn't support bpf-to-bpf calls With dmesg: multi-func JIT bug 1391 != 1390 The root cause is that verifier will refill the imm with the correct addresses of bpf_calls for BPF_PSEUDO_FUNC instructions and then run the last pass of JIT. So we generate different JIT code for the same instruction in two passes (one for placeholder and the other for the real address). Let's use move_addr() instead. See commit64f50f6575("LoongArch, bpf: Use 4 instructions for function address in JIT") for a similar fix. Cc: stable@vger.kernel.org Fixes:69c087ba62("bpf: Add bpf_for_each_map_elem() helper") Fixes:bb035ef0cc("LoongArch: BPF: Support mixing bpf2bpf and tailcalls") Reported-by: Vincent Li <vincent.mc.li@gmail.com> Tested-by: Vincent Li <vincent.mc.li@gmail.com> Closes: https://lore.kernel.org/loongarch/CAK3+h2yfM9FTNiXvEQBkvtuoJrvzmN4c_NZsFXqEk4Cj1tsBNA@mail.gmail.com/T/#u Signed-off-by: Hengqi Chen <hengqi.chen@gmail.com> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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.