From: Alexei Starovoitov <ast@fb.com>
Date: Fri, 12 Aug 2016 01:17:18 +0000 (-0700)
Subject: bpf: allow bpf_get_prandom_u32() to be used in tracing
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=8937bd80fce64a25be23c7790459d93f7b1e9b79;p=openwrt%2Fstaging%2Fblogic.git

bpf: allow bpf_get_prandom_u32() to be used in tracing

bpf_get_prandom_u32() was initially introduced for socket filters
and later requested numberous times to be added to tracing bpf programs
for the same reason as in socket filters: to be able to randomly
select incoming events.

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

diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 6b794d6669a7..ad35213b8405 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -437,6 +437,8 @@ static const struct bpf_func_proto *tracing_func_proto(enum bpf_func_id func_id)
 		return bpf_get_probe_write_proto();
 	case BPF_FUNC_current_task_under_cgroup:
 		return &bpf_current_task_under_cgroup_proto;
+	case BPF_FUNC_get_prandom_u32:
+		return &bpf_get_prandom_u32_proto;
 	default:
 		return NULL;
 	}