[PATCH] netlink: add nl_set_extack_cookie_u64()

[Johannes Berg <johannes-cdvu00un1VgdHxzADdlk8Q@public.gmane.org>]

From: Johannes Berg <johannes.berg-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>

Add a helper function nl_set_extack_cookie_u64() to use a u64 as
the netlink extended ACK cookie, to avoid having to open-code it
in any users of the cookie.

A u64 should be sufficient for most subsystems though we allow
for up to 20 bytes right now. This also matches the cookies in
nl80211 where I intend to use this.

Signed-off-by: Johannes Berg <johannes.berg-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
---
 include/linux/netlink.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/linux/netlink.h b/include/linux/netlink.h
index 71f121b66ca8..dc3c21dc4ba2 100644
--- a/include/linux/netlink.h
+++ b/include/linux/netlink.h
@@ -110,6 +110,15 @@ struct netlink_ext_ack {
 	}						\
 } while (0)
 
+static inline void nl_set_extack_cookie_u64(struct netlink_ext_ack *extack,
+					    u64 cookie)
+{
+	u64 __cookie = cookie;
+
+	memcpy(extack->cookie, &__cookie, sizeof(__cookie));
+	extack->cookie_len = sizeof(__cookie);
+}
+
 extern void netlink_kernel_release(struct sock *sk);
 extern int __netlink_change_ngroups(struct sock *sk, unsigned int groups);
 extern int netlink_change_ngroups(struct sock *sk, unsigned int groups);
-- 
2.14.4