Re: Need update to libbpf/bpftool for bpf_stream_vprintk() removal (kernel sha 0cecd492f516)

[Quentin Monnet <qmo@kernel.org>]

2026-03-09 16:01 UTC-0700 ~ Calvin Owens <calvin@wbinvd.org>
> On Monday 03/09 at 20:34 +0000, Quentin Monnet wrote:
>> 2026-03-09 10:57 UTC-0700 ~ Calvin Owens <calvin@wbinvd.org>
>>> Hi Andrii,
>>>
>>> Your libbpf github sync at [1] happened just before [2] was merged...
>>> would you mind syncing that bpf_helpers.h change into libbpf/bpftool?
>>>
>>>     In file included from skeleton/profiler.bpf.c:4:
>>>     libbpf/include/bpf/bpf_helpers.h:318:12: error: conflicting types for 'bpf_stream_vprintk'
>>>          318 | extern int bpf_stream_vprintk(int stream_id, const char *fmt__str, const void *args,
>>>              |            ^
>>>     ./vmlinux.h:128001:12: note: previous declaration is here
>>>       128001 | extern int bpf_stream_vprintk(int stream_id, const char *fmt__str, const void *args, u32 len__sz) __weak __ksym;
>>
>>
>> Hi, where did you observe that, please? I don't see it when compiling
>> bpftool from the main branch of the GitHub repo.
> 
> Hi Quentin,
> 
> Thanks for looking, apologies for not adding you to the initial mail.
> 
> It's bpftool-7.6.0 with libbpf-1.6.2 that is failing to build in my
> case (with 7.0-rc kernels), exactly what is described here:
> 
>     https://github.com/libbpf/libbpf/issues/947


Ok, reading your first message I thought the error was when compiling
bpftool itself. Now I get it, thanks.


> I think it was just "bad luck" that it missed Andrii's sync, it was
> committed in the kernel 18 hours after his sync. But maybe I'm assuming
> too much from the timing...


Ihor and Andrii synced the libbpf mirror a few hours ago, and I just
updated the bpftool repo, so you should be able to pull the fix from there.

Best regards,
Quentin