Re: [PATCH bpf-next v2 3/4] selftests/bpf: Test jited inline of bpf_get_current_task() for LoongArch

[sashiko-bot@kernel.org]

Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
- [Medium] The selftest expects `bpf_get_current_task()` to be JIT-inlined to `move $a5, $tp` on LoongArch, but the required kernel JIT implementation is missing, causing the test to fail.
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commit f8173ba138660b46dd1d6b8e58aa91f97cddc7a8
Author: Tiezhu Yang <yangtiezhu@loongson.cn>

selftests/bpf: Test jited inline of bpf_get_current_task() for LoongArch

This commit adds a selftest expectation for the JIT-inlined version of
bpf_get_current_task() on LoongArch.

> diff --git a/tools/testing/selftests/bpf/progs/verifier_jit_inline.c b/tools/testing/selftests/bpf/progs/verifier_jit_inline.c
> index 76d80605ec7fd..8560577f25576 100644
> --- a/tools/testing/selftests/bpf/progs/verifier_jit_inline.c
> +++ b/tools/testing/selftests/bpf/progs/verifier_jit_inline.c
> @@ -12,6 +12,8 @@ __arch_arm64
>  __jited("	mrs	x8, SP_EL0")
>  __arch_riscv64
>  __jited("	mv	a5, tp")
> +__arch_loongarch
> +__jited("	move	$a5, $tp")

[Severity: Medium]
Is the corresponding kernel patch implementing this JIT inline missing from
the tree?

Without the logic in arch/loongarch/net/bpf_jit.c to inline
BPF_FUNC_get_current_task, the BPF JIT emits a standard helper function
call rather than the expected instruction sequence.

Will this cause the selftest to unconditionally fail?

>  int inline_bpf_get_current_task(void)
>  {
>  	bpf_get_current_task();

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Sashiko AI review · https://sashiko.dev/#/patchset/20260615100506.19558-1-yangtiezhu@loongson.cn?part=3