Subject: Re: build failure of next-20220811 due to 332f1795ca20 ("Bluetooth: L2CAP: Fix l2cap_global_chan_by_psm regression")

From: Jakub Kicinski <[email-masked]>
Date: Thu, 11 Aug 2022 12:46:37 -0700

On Thu, 11 Aug 2022 19:53:04 +0100 Sudip Mukherjee (Codethink) wrote:
> Not sure if it has been reported, builds of csky and mips allmodconfig
> failed to build next-20220811 with gcc-12.

I can't repro with the cross compiler from kernel.org.
Can you test something like this?

diff --git a/include/net/bluetooth/bluetooth.h b/include/net/bluetooth/bluetooth.h
index e72f3b247b5e..82bf8e01f7af 100644
--- a/include/net/bluetooth/bluetooth.h
+++ b/include/net/bluetooth/bluetooth.h
@@ -341,6 +341,11 @@ static inline bool bdaddr_type_is_le(u8 type)
 #define BDADDR_ANY  (&(bdaddr_t) {{0, 0, 0, 0, 0, 0}})
 #define BDADDR_NONE (&(bdaddr_t) {{0xff, 0xff, 0xff, 0xff, 0xff, 0xff}})
 
+static inline int ba_is_any(const bdaddr_t *ba)
+{
+	return memchr_inv(ba, sizeof(*ba), 0);
+}
+
 /* Copy, swap, convert BD Address */
 static inline int bacmp(const bdaddr_t *ba1, const bdaddr_t *ba2)
 {
diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 77c0aac14539..a08ec272be4a 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -2001,8 +2001,8 @@ static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm,
 			}
 
 			/* Closest match */
-			src_any = !bacmp(&c->src, BDADDR_ANY);
-			dst_any = !bacmp(&c->dst, BDADDR_ANY);
+			src_any = !ba_is_any(&c->src);
+			dst_any = !ba_is_any(&c->dst);
 			if ((src_match && dst_any) || (src_any && dst_match) ||
 			    (src_any && dst_any))
 				c1 = c;