Re: [PATCH bpf-next v6 2/2] bpf: Hold the perf callchain entry until used completely

[Alexei Starovoitov]

On Wed, Dec 3, 2025 at 1:34 AM Tao Chen <chen.dylane@xxxxxxxxx> wrote:
>
> 在 2025/11/26 17:29, Tao Chen 写道:
> > 在 2025/11/14 00:01, Yonghong Song 写道:
> >>
> >>
> >> On 11/12/25 8:31 AM, Tao Chen wrote:
> >>> As Alexei noted, get_perf_callchain() return values may be reused
> >>> if a task is preempted after the BPF program enters migrate disable
> >>> mode. The perf_callchain_entres has a small stack of entries, and
> >>> we can reuse it as follows:
> >>>
> >>> 1. get the perf callchain entry
> >>> 2. BPF use...
> >>> 3. put the perf callchain entry
> >>>
> >>> And Peter suggested that get_recursion_context used with preemption
> >>> disabled, so we should disable preemption at BPF side.
> >>>
> >>> Signed-off-by: Tao Chen <chen.dylane@xxxxxxxxx>
> >>
> >> Acked-by: Yonghong Song <yonghong.song@xxxxxxxxx>
> >>
> >
> > Hi eBPF maintainers,
> >
> > This patch appears to have missed the eBPF maintainers on the list,
> > please review it again, thanks.
> >
>
> ping...

pls resubmit and ask Peter to ack that your patches match what he suggested.