Merge branch 'bpf-riscv-add-timed-may_goto-support'

Feng Jiang says:

====================
bpf, riscv: add timed may_goto support

This series adds RISC-V JIT support for the timed may_goto loop bound.

Patch 1 implements arch_bpf_timed_may_goto() and enables
bpf_jit_supports_timed_may_goto() so the verifier uses the timed
expansion path.

Patch 2 adds a test that checks R0-R5 are preserved across
arch_bpf_timed_may_goto() calls.

Patch 3 enables the verifier_may_goto_1, stream_cond_break, and
may_goto_interaction fastcall tests on riscv64.

Tested on riscv64 QEMU (rva23s64): may_goto programs load and JIT
correctly, and the 250ms timeout path works as expected.

Signed-off-by: Feng Jiang <jiangfeng@kylinos.cn>
Tested-by: Pu Lehui <pulehui@huawei.com>
Reviewed-by: Björn Töpel <bjorn@kernel.org>
Acked-by: Björn Töpel <bjorn@kernel.org>
---
Changes in v5:
- Use REG_S/REG_L/SZREG in arch_bpf_timed_may_goto assembly. (Pu Lehui)
- Add __arch_s390x to the timed_may_goto_preserves_regs test. (Pu Lehui)
- Switch the preserves-regs test to SEC("syscall") to fix
  bpf_prog_test_run() EINVAL.
- Link to v4: https://lore.kernel.org/r/20260722-riscv-bpf-timed-may-goto-v4-0-e117e6337bc7@kylinos.cn

Changes in v4:
- Add 'bpf-next' prefix to match the BPF kernel tree workflow.
- Add a test checking that R0-R5 are preserved across
  arch_bpf_timed_may_goto() calls. Use bpf_get_prandom_u32() to
  prevent the verifier from removing the checks via DCE.
- Rename may_goto_interaction_arm64() to may_goto_interaction().
- Wrap the arch_bpf_timed_may_goto address check to a single line.
- Link to v3: https://lore.kernel.org/r/20260715-riscv-bpf-timed-may-goto-v3-0-cf2a9c3d843f@kylinos.cn

Changes in v3:
- Set up the frame pointer in arch_bpf_timed_may_goto() so the function
  does not break stack unwinding under CONFIG_FRAME_POINTER.

Changes in v2:
- Fix BPF_REG_0 being clobbered after arch_bpf_timed_may_goto() calls.
- Enable the may_goto_interaction fastcall test on riscv64.

---
====================

Link: https://patch.msgid.link/20260723-riscv-bpf-timed-may-goto-v5-0-86acb54e5642@kylinos.cn
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>

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