[PATCH bpf-next] bpf: cgroup: Fix build error without CONFIG_NET

[YueHaibing]

If CONFIG_NET is not set, gcc building fails:

kernel/bpf/cgroup.o: In function `cg_sockopt_func_proto':
cgroup.c:(.text+0x237e): undefined reference to `bpf_sk_storage_get_proto'
cgroup.c:(.text+0x2394): undefined reference to `bpf_sk_storage_delete_proto'
kernel/bpf/cgroup.o: In function `__cgroup_bpf_run_filter_getsockopt':
(.text+0x2a1f): undefined reference to `lock_sock_nested'
(.text+0x2ca2): undefined reference to `release_sock'
kernel/bpf/cgroup.o: In function `__cgroup_bpf_run_filter_setsockopt':
(.text+0x3006): undefined reference to `lock_sock_nested'
(.text+0x32bb): undefined reference to `release_sock'

Add CONFIG_NET dependency to fix this.

Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Fixes: 0d01da6afc54 ("bpf: implement getsockopt and setsockopt hooks")
Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
---
 init/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/init/Kconfig b/init/Kconfig
index e2e51b5..341cf2a 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -998,6 +998,7 @@ config CGROUP_PERF
 config CGROUP_BPF
 	bool "Support for eBPF programs attached to cgroups"
 	depends on BPF_SYSCALL
+	depends on NET
 	select SOCK_CGROUP_DATA
 	help
 	  Allow attaching eBPF programs to a cgroup using the bpf(2)
-- 
2.7.4