Re: [linux-next][41e83b9][gcc 4.8.5] make modules fail at net/netfilter/xt_bpf.ko

On Tue, 2017-12-05 at 18:06 +0000, Al Viro wrote:

On Tue, Dec 05, 2017 at 08:13:11PM +0530, Abdul Haleem wrote:

quoted

Hi Al Viro,

Today's next kernel build failed with commit 41e83b9: fix "netfilter:
xt_bpf: Fix XT_BPF_MODE_FD_PINNED

Machine Type: Power 7
kernel version: 4.15.0-rc2-next-20171204
kernel config: attached
test: 'make modules'

ERROR: ".bpf_prog_get_type_path" [net/netfilter/xt_bpf.ko] undefined!

Kernel built fine when bad commit is reverted.

In the same commit there's

+EXPORT_SYMBOL(bpf_prog_get_type_path);

so I really wonder WTF is going on...

Oh, I see.  !BPF_SYSCALL and NETFILTER_XT_MATCH_BPF in .config triggers
that.  Incremental (to be folded into the commit in question) follows:

Thank you for the patch, the build succeeded. But I see some new
warnings.

./include/linux/bpf.h: In function ‘bpf_prog_get_type_path’:
./include/linux/bpf.h:515:2: warning: return makes pointer from integer
without a cast [enabled by default]
  return -EOPNOTSUPP;
  ^

-- 
Regard's

Abdul Haleem
IBM Linux Technology Centre