Re: [PATCH bpf-next v1] selftests/bpf: Test jited inline of bpf_get_smp_processor_id() for RISC-V

[Pu Lehui <pulehui@huawei.com>]

On 2026/7/22 15:01, Tiezhu Yang wrote:
> Add the JITed inline instruction of bpf_get_smp_processor_id() for RISC-V
> to pass the test case.
> 
> On RISC-V, the 'cpu' field of 'struct thread_info' resides at offset 0x20,
> BPF_REG_0 maps to the a5 register, and the thread pointer (tp) is used as
> the base address. Therefore, the JIT compiler emits "lw a5, 0x20(tp)" to
> optimize this helper call.
> 
> Tested on a RISC-V virtual machine.
> 
> Before:
>    $ sudo ./test_progs -t verifier_jit_inline
>    #610/1   verifier_jit_inline/inline_bpf_get_current_task:OK
>    #610/2   verifier_jit_inline/inline_bpf_get_smp_processor_id:SKIP
>    #610     verifier_jit_inline:OK (SKIP: 1/2)
>    Summary: 1/1 PASSED, 1 SKIPPED, 0 FAILED
> 
> After:
>    $ sudo ./test_progs -t verifier_jit_inline
>    #610/1   verifier_jit_inline/inline_bpf_get_current_task:OK
>    #610/2   verifier_jit_inline/inline_bpf_get_smp_processor_id:OK
>    #610     verifier_jit_inline:OK
>    Summary: 1/2 PASSED, 0 SKIPPED, 0 FAILED
> 
> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
> ---
>   tools/testing/selftests/bpf/progs/verifier_jit_inline.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/tools/testing/selftests/bpf/progs/verifier_jit_inline.c b/tools/testing/selftests/bpf/progs/verifier_jit_inline.c
> index 02e562f56f9d..c696baa5364b 100644
> --- a/tools/testing/selftests/bpf/progs/verifier_jit_inline.c
> +++ b/tools/testing/selftests/bpf/progs/verifier_jit_inline.c
> @@ -25,6 +25,8 @@ SEC("fentry/bpf_fentry_test2")
>   __success __retval(0)
>   __arch_loongarch
>   __jited("	ld.wu	$a5, $tp, 16")
> +__arch_riscv64
> +__jited("	lw	a5, 0x20(tp)")
>   int inline_bpf_get_smp_processor_id(void)
>   {
>   	bpf_get_smp_processor_id();

Hi Tiezhu,

There are many places in selftest can be add __arch_riscv64 tag, I think 
we can enable them witch one patch.