linux-kernel - [PATCH v2] wireguard (gcc13): move ULLs limits away from enum

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Date:   Mon, 12 Dec 2022 12:47:12 +0100
From:   "Jiri Slaby (SUSE)" <jirislaby@...nel.org>
To:     Jason@...c4.com
Cc:     linux-kernel@...r.kernel.org,
        "Jiri Slaby (SUSE)" <jirislaby@...nel.org>,
        Martin Liska <mliska@...e.cz>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, wireguard@...ts.zx2c4.com,
        netdev@...r.kernel.org
Subject: [PATCH v2] wireguard (gcc13): move ULLs limits away from enum

Since gcc13, each member of an enum has the same type as the enum [1]. And
that is inherited from its members. Provided these two:
  REKEY_AFTER_MESSAGES = 1ULL << 60
  REJECT_AFTER_MESSAGES = U64_MAX - COUNTER_WINDOW_SIZE - 1
the named type is unsigned long.

This generates warnings with gcc-13:
  error: format '%d' expects argument of type 'int', but argument 6 has type 'long unsigned int'

Define such high values as macros instead of in the enum. Note that
enums are not guaranteed to hold unsigned longs in any way.

And use BIT_ULL() for REKEY_AFTER_MESSAGES.

[1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=36113

Cc: Martin Liska <mliska@...e.cz>
Cc: "Jason A. Donenfeld" <Jason@...c4.com>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Paolo Abeni <pabeni@...hat.com>
Cc: wireguard@...ts.zx2c4.com
Cc: netdev@...r.kernel.org
Signed-off-by: Jiri Slaby (SUSE) <jirislaby@...nel.org>
---

Notes:
    [v2] move the constant out of enum (David)

 drivers/net/wireguard/messages.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireguard/messages.h b/drivers/net/wireguard/messages.h
index 208da72673fc..048125bdcd23 100644
--- a/drivers/net/wireguard/messages.h
+++ b/drivers/net/wireguard/messages.h
@@ -37,9 +37,10 @@ enum counter_values {
 	COUNTER_WINDOW_SIZE = COUNTER_BITS_TOTAL - COUNTER_REDUNDANT_BITS
 };
 
+#define REKEY_AFTER_MESSAGES	BIT_ULL(60)
+#define REJECT_AFTER_MESSAGES	(U64_MAX - COUNTER_WINDOW_SIZE - 1)
+
 enum limits {
-	REKEY_AFTER_MESSAGES = 1ULL << 60,
-	REJECT_AFTER_MESSAGES = U64_MAX - COUNTER_WINDOW_SIZE - 1,
 	REKEY_TIMEOUT = 5,
 	REKEY_TIMEOUT_JITTER_MAX_JIFFIES = HZ / 3,
 	REKEY_AFTER_TIME = 120,
-- 
2.38.1