Re: [PATCH v3 net-next 1/9] af_unix: Factorise test_bit() for SOCK_PASSCRED and SOCK_PASSPIDFD.

Currently, the same checks for SOCK_PASSCRED and SOCK_PASSPIDFD
are scattered across many places.

Let's centralise the bit tests to make the following changes cleaner.

Signed-off-by: Kuniyuki Iwashima <redacted>
---
 net/unix/af_unix.c | 37 +++++++++++++++----------------------
 1 file changed, 15 insertions(+), 22 deletions(-)

diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 2ab20821d6bb..464e183ffdb8 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c

@@ -765,6 +765,14 @@ static void copy_peercred(struct sock *sk, struct sock *peersk)
 	spin_unlock(&sk->sk_peer_lock);
 }
 
+static bool unix_may_passcred(const struct sock *sk)
+{
+	struct socket *sock = sk->sk_socket;

+
+	return test_bit(SOCK_PASSCRED, &sock->flags) ||
+		test_bit(SOCK_PASSPIDFD, &sock->flags);
+}