[PATCH v3] bpf: fix build warning - missing prototype

[Jean-Philippe Menil <jpmenil@xxxxxxxxx>]

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@xxxxxxxxx>
---
 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