net_sched: constify qdisc_priv()

In order to propagate const qualifiers, we change qdisc_priv()
to accept a possibly const argument.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/pkt_sched.h b/include/net/pkt_sched.h
index 15960564e0c364ef430f1e3fcdd0e835c2f94a77..9fa1d0794dfa5241705f9a39c896ed44519a9f13 100644 (file)
--- a/include/net/pkt_sched.h
+++ b/include/net/pkt_sched.h
@@ -20,10 +20,10 @@ struct qdisc_walker {
        int     (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);
 };
 
-static inline void *qdisc_priv(struct Qdisc *q)
-{
-       return &q->privdata;
-}
+#define qdisc_priv(q)                                                  \
+       _Generic(q,                                                     \
+                const struct Qdisc * : (const void *)&q->privdata,     \
+                struct Qdisc * : (void *)&q->privdata)
 
 static inline struct Qdisc *qdisc_from_priv(void *priv)
 {