samples/bpf: fix bpf_perf_event_output prototype

The commit 555c8a8623a3 ("bpf: avoid stack copy and use skb ctx for event output")
started using 20 of initially reserved upper 32-bits of 'flags' argument
in bpf_perf_event_output(). Adjust corresponding prototype in samples/bpf/bpf_helpers.h

Signed-off-by: Adam Barth <arb@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/trafgen.8 b/trafgen.8
index a4339ca..4da5a35 100644
--- a/trafgen.8
+++ b/trafgen.8
@@ -790,7 +790,7 @@ Another real-world example by Jesper Dangaard Brouer [1]:
      'A',  fill(0x41, 11),
    }
 .PP
-   [1] http://thread.gmane.org/gmane.linux.network/257155
+   [1] https://marc.info/?l=linux-netdev&m=135903630614184
 .PP
 The above example rewritten using the header generation functions:
 .PP