netdev - [PATCH bpf] bpf: Fix build in minimal configurations

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Message-ID: <20191128043508.2346723-1-ast@kernel.org>
Date:   Wed, 27 Nov 2019 20:35:08 -0800
From:   Alexei Starovoitov <ast@...nel.org>
To:     <davem@...emloft.net>
CC:     <daniel@...earbox.net>, <rdunlap@...radead.org>,
        <netdev@...r.kernel.org>, <bpf@...r.kernel.org>,
        <kernel-team@...com>
Subject: [PATCH bpf] 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@...radead.org>
Signed-off-by: Alexei Starovoitov <ast@...nel.org>
---
 kernel/bpf/btf.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index bd5e11881ba3..7d40da240891 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -3463,6 +3463,7 @@ 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) \
-- 
2.23.0