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

From: Alexei Starovoitov <[email-masked]>
Date: Tue, 12 Dec 2017 17:47:32 -0800

On Wed, Dec 13, 2017 at 12:32:45PM +1100, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the bpf-next tree, today's linux-next build (arm
> multi_v7_defconfig) failed like this:
> 
> kernel/events/core.o: In function `perf_ioctl':
> core.c:(.text+0x98c4): undefined reference to `bpf_event_query_prog_array'
> 
> Caused by commit
> 
>   f371b304f12e ("bpf/tracing: allow user space to query prog array on the same tp")
> 
> CONFIG_BPF_SYSCALL is not set for this build.
> 
> I have used the bpf-next tree from next-20171212 for today.

Thanks for the report.
Yonghong, please take a look and send a followup fix based on bpf-next tree.