Re: [PATCH v3 0/3] LoongArch: BPF: Refine move_imm() and optimize 32-bit operations

[Huacai Chen]

On Thu, Oct 22, 2026 at 3:44 PM Tiezhu Yang <yangtiezhu@xxxxxxxxxxx> wrote:
>
> On 2026/10/16 下午4:10, Tiezhu Yang wrote:
> > v3:
> >    -- Add a prerequisite patch to detect CPUCFG2_DIV32 feature.
> >    -- Fix a hardware compatibility bug by checking cpu_has_div32
> >       before emitting native 32-bit div/mod instructions.
> >
> > This version is based on v7.3-rc7 and has been tested on Loongson-3A6000
> > and Loongson-3A5000 physical machines.
> >
> > All of the testcases of test_bpf passed on Loongson-3A6000 (with DIV32)
> > and Loongson-3A5000 (without DIV32), here are the test results:
> >
> > $ sudo modprobe test_bpf
> > $ dmesg -t | grep Summary
> > test_bpf: Summary: 1061 PASSED, 0 FAILED, [1049/1049 JIT'ed]
> > test_bpf: test_tail_calls: Summary: 10 PASSED, 0 FAILED, [10/10 JIT'ed]
> > test_bpf: test_skb_segment: Summary: 2 PASSED, 0 FAILED
> >
> > For the BPF selftests test_verifier and test_progs, there are no any
> > regressions.
> >
> > Tiezhu Yang (3):
> >    LoongArch: Add CPUCFG2 DIV32 feature detection
> >    LoongArch: BPF: Clean up and decouple is32 parameter from move_imm()
> >    LoongArch: BPF: Optimize 32-bit operations using native instructions
>
> Hi Huacai, Hengqi,
>
> A gentle ping on the last 2 patches of this series since patch 1
> has been applied.
>
> There are no any reports from bot+bpf-ci and sashiko-bot,
> and also "test_bpf" and "./test_progs -t jit_insns" tests passed.
>
> Just to clarify the testing status: the 3 failures mentioned in
> the previous test report are entirely pre-existing on the clean
> bpf-next tree and completely unrelated to this 32-bit optimization
> series.
>
> The core ALU32/JMP32 paths introduced here have been fully verified
> and passed without any regressions on both 3A6000 and 3A5000 physical
> machines.
>
> Do you have any further comments or objections to patches 2 and 3?
> If these look good to you, it would be great to have them merged to
> avoid rebasing and resending these patches after this merge window.
I hope Hengqi can take a look before applying.

Huacai

>
> Thanks,
> Tiezhu
>