On Thu, Jan 11, 2018 at 11:53:55AM +1100, Stephen Rothwell wrote:

Hi all,

After merging the net-next tree, today's linux-next build (x86_64
allmodconfig) failed like this:

kernel/bpf/verifier.o: In function `bpf_check':
verifier.c:(.text+0xd86e): undefined reference to `bpf_patch_call_args'

Caused by commit

  1ea47e01ad6e ("bpf: add support for bpf_call to interpreter")

interacting with commit

  290af86629b2 ("bpf: introduce BPF_JIT_ALWAYS_ON config")

from the bpf and net trees.

I have just reverted commit 290af86629b2 for today.  A better solution
would be nice (lie fixing this in a merge between the net-next and net
trees).

that's due to 'endif' from 290af86629b2 needs to be moved above
bpf_patch_call_args() definition.
There is another fixup needed for net-next.
I'll send a follow up patch when net gets merged into net-next.