bpf: Fix build warning regarding missing prototypes

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 out by Alexei.

Signed-off-by: Jean-Philippe Menil <jpmenil@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20200327204713.28050-1-jpmenil@gmail.com

diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c
index 4c921f5..29dbdd4 100644 (file)
--- a/net/bpf/test_run.c
+++ b/net/bpf/test_run.c
@@ -114,6 +114,9 @@ out:
  * 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;
@@ -149,6 +152,7 @@ int noinline bpf_modify_return_test(int a, int *b)
        *b += 1;
        return a + *b;
 }
+__diag_pop();
 
 ALLOW_ERROR_INJECTION(bpf_modify_return_test, ERRNO);