Merge branch 'add-bpf-stack-arguments-support-for-rv64'

Pu Lehui says:

====================
Add bpf stack arguments support for RV64

Implement bpf_jit_supports_stack_args() on RV64 JIT to allow bpf
subprogs and kfuncs to pass and receive more than 5 arguments.

Tested on riscv64 QEMU with LLVM main [1]; BPF-to-BPF and kfunc
selftests pass.

[1] https://github.com/llvm/llvm-project/pull/189060
---
Changes in v5:
- Add RV_EXTRA_STK_ARGS macro to represent the exceeding stack args
  passed in riscv arg regs. (BPF CI)
- Optimize emit_stack_arg_st() by materializing immediates directly
  into destination registers. (BPF CI)
- Update stale comments. (BPF CI and sashiko)

Changes in v4:
- Remap BPF_REG_0 and RV_REG_TCC to align the calling convention of
  bpf2bpf and kfunc calls with the riscv abi.
- Adapt the bpf stack arguments implementation based on change 1.

Changes in v3:
- Drop the exceptions.c guard change: the guarded programs use
  bpf_throw(), unsupported by the RV64 JIT, so the test is denylisted
  on riscv64 and the guard has no effect. (BPF CI)
- Link to v2: https://lore.kernel.org/r/20260813-bpf-riscv-stack-args-v2-0-efea8f9b3fe1@kylinos.cn

Changes in v2:
- Sign-extend 32-bit kfunc arguments passed on the stack (args 9+),
  matching the register path and the RISC-V psABI. (Sashiko)
- Restrict the riscv selftest guard to __riscv_xlen == 64 so the
  tests are not enabled on RV32. (Sashiko)
- Link to v1: https://lore.kernel.org/r/20260812-bpf-riscv-stack-args-v1-0-67b246806e59@kylinos.cn
====================

Acked-by: Björn Töpel <bjorn@kernel.org>
Link: https://patch.msgid.link/20260905085857.14143-1-pulehui@huaweicloud.com
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>

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