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From:   Jean-Philippe Menil <jpmenil@gmail.com>
To:     alexei.starovoitov@gmail.com
Cc:     kernel-janitors@vger.kernel.org, jpmenil@gmail.com,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        Martin KaFai Lau <kafai@fb.com>,
        Song Liu <songliubraving@fb.com>, Yonghong Song <yhs@fb.com>,
        Andrii Nakryiko <andriin@fb.com>, netdev@vger.kernel.org,
        bpf@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v3] bpf: fix build warning - missing prototype
Date:   Fri, 27 Mar 2020 08:55:44 +0100
Message-Id: <20200327075544.22814-1-jpmenil@gmail.com>
In-Reply-To: <20200326235426.ei6ae2z5ek6uq3tt@ast-mbp>
References: <20200326235426.ei6ae2z5ek6uq3tt@ast-mbp>
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Fix build warnings when building net/bpf/test_run.o with W=1 due
to missing prototype for bpf_fentry_test{1..6}.

Instead of declaring prototypes, turn off warnings with
__diag_{push,ignore,pop} as pointed by Alexei.

Signed-off-by: Jean-Philippe Menil <jpmenil@gmail.com>
---
 net/bpf/test_run.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c
index d555c0d8657d..cc1592413fc3 100644
--- a/net/bpf/test_run.c
+++ b/net/bpf/test_run.c
@@ -113,6 +113,9 @@ static int bpf_test_finish(const union bpf_attr *kattr,
  * architecture dependent calling conventions. 7+ can be supported in the
  * future.
  */
+__diag_push();
+__diag_ignore(GCC, 8, "-Wmissing-prototypes",
+	      "Global functions as their definitions will be in vmlinux BTF);
 int noinline bpf_fentry_test1(int a)
 {
 	return a + 1;
@@ -143,6 +146,8 @@ int noinline bpf_fentry_test6(u64 a, void *b, short c, int d, void *e, u64 f)
 	return a + (long)b + c + d + (long)e + f;
 }
 
+__diag_pop();
+
 static void *bpf_test_init(const union bpf_attr *kattr, u32 size,
 			   u32 headroom, u32 tailroom)
 {
-- 
2.26.0