netdev - [PATCH iproute2 1/2] utils: Fix BIT() to support up to 64 bits on all architectures

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Message-ID: <20210628232446.GA1443@cephalopod>
Date:   Tue, 29 Jun 2021 01:24:46 +0200
From:   Ben Hutchings <ben.hutchings@...d.be>
To:     netdev@...r.kernel.org
Subject: [PATCH iproute2 1/2] utils: Fix BIT() to support up to 64 bits on
 all architectures

devlink and vdpa use BIT() together with 64-bit flag fields.  devlink
is already using bit numbers greater than 31 and so does not work
correctly on 32-bit architectures.

Fix this by making BIT() use uint64_t instead of unsigned long.

Signed-off-by: Ben Hutchings <ben.hutchings@...d.be>
---
 include/utils.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/utils.h b/include/utils.h
index 187444d5..70db9f60 100644
--- a/include/utils.h
+++ b/include/utils.h
@@ -8,6 +8,7 @@
 #include <stdlib.h>
 #include <stdbool.h>
 #include <time.h>
+#include <stdint.h>
 
 #ifdef HAVE_LIBBSD
 #include <bsd/string.h>
@@ -264,7 +265,7 @@ void print_nlmsg_timestamp(FILE *fp, const struct nlmsghdr *n);
 unsigned int print_name_and_link(const char *fmt,
 				 const char *name, struct rtattr *tb[]);
 
-#define BIT(nr)                 (1UL << (nr))
+#define BIT(nr)                 (UINT64_C(1) << (nr))
 
 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
 
-- 
2.20.1