Subject: Re: linux-next: build failure after merge of the tip tree

From: Daniel Borkmann <[email-masked]>
Date: Tue, 07 Apr 2015 13:13:36 +0200

[ Cc'ing Dave, fyi ]

On 04/07/2015 11:05 AM, Stephen Rothwell wrote:
> On Tue, 07 Apr 2015 10:56:13 +0200 Daniel Borkmann <[email-masked]> wrote:
>> On 04/07/2015 10:48 AM, Ingo Molnar wrote:
>>> * Stephen Rothwell <[email-masked]> wrote:
>>>
>>>> After merging the tip tree, today's linux-next build (powerpc
>>>> ppc64_defconfig) failed like this:
>>>>
>>>> kernel/events/core.c: In function 'perf_event_set_bpf_prog':
>>>> kernel/events/core.c:6732:15: error: 'struct bpf_prog_aux' has no member named 'prog_type'
>>>>     if (prog->aux->prog_type != BPF_PROG_TYPE_KPROBE) {
>>>>                  ^
>>>>
>>>> Caused by commit 2541517c32be ("tracing, perf: Implement BPF programs
>>>> attached to kprobes").
>>>
>>> Note, this must be some (rarely triggered) aspect of the ppc64
>>> defconfig that neither x86 randconfigs nor most other arch defconfigs
>>> expose?
>>
>> Note, this is a merge conflict with the work that went via net-next tree,
>> i.e. 24701ecea76b ("ebpf: move read-only fields to bpf_prog and shrink
>> bpf_prog_aux"). I believe that is why it didn't trigger on tip tree.
>>
>> You should be able to resolve it in linux-next by changing the test to:
>>
>>     if (prog->prog_type != BPF_PROG_TYPE_KPROBE) {
>
> Thanks Daniel, I will do that tomorrow.  Someone will have to remember
> to tell Linus.

Yes, indeed, depending which tree is merged first.

Thanks,
Daniel