From 1770163797a2544d9bfdfd5d54c1ec89530560c8 Mon Sep 17 00:00:00 2001
From: Alexei Starovoitov <ast@kernel.org>
Date: Wed, 27 Nov 2019 20:35:08 -0800
Subject: [PATCH] UPSTREAM: bpf: Fix build in minimal configurations

Some kconfigs can have BPF enabled without a single valid program type.
In such configurations the build will fail with:
./kernel/bpf/btf.c:3466:1: error: empty enum is invalid

Fix it by adding unused value to the enum.

Reported-by: Randy Dunlap <rdunlap@infradead.org>
Change-Id: Ic2f3178cedf6461098d92357b2cb8b79f0434c3f
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Randy Dunlap <rdunlap@infradead.org> # build-tested
Link: https://lore.kernel.org/bpf/20191128043508.2346723-1-ast@kernel.org
---
 kernel/bpf/btf.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index ca72b80456a0..ed7dfaf2fe63 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -3469,6 +3469,7 @@ enum {
 	__ctx_convert##_id,
 #include <linux/bpf_types.h>
 #undef BPF_PROG_TYPE
+	__ctx_convert_unused, /* to avoid empty enum in extreme .config */
 };
 static u8 bpf_ctx_convert_map[] = {
 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \