On Wed, 2007-09-19 at 12:54 -0700, David Miller wrote:
> Applied to net-2.6.24, thanks Joe!
Here is a patch that adds some type safety to print_mac
by using a struct print_mac_buf * instead of char *.
It also reduces the defconfig vmlinux size by 8 bytes.
Signed-off-by: Joe Perches <[EMAIL PROTECTED]>
--
include/linux/if_ether.h | 12 ++++++++++--
net/ethernet/eth.c | 6 +++---
2 files changed, 13 insertions(+), 5 deletions(-)
diff --git a/include/linux/if_ether.h b/include/linux/if_ether.h
index 57abca1..620d6b1 100644
--- a/include/linux/if_ether.h
+++ b/include/linux/if_ether.h
@@ -126,7 +126,15 @@ extern struct ctl_table ether_table[];
* Display a 6 byte device address (MAC) in a readable format.
*/
#define MAC_FMT "%02x:%02x:%02x:%02x:%02x:%02x"
-extern char *print_mac(char *buf, const u8 *addr);
-#define DECLARE_MAC_BUF(var) char var[18] __maybe_unused
+
+struct print_mac_buf {
+ char formatted_mac_addr[18];
+};
+
+#define DECLARE_MAC_BUF(var) \
+ struct print_mac_buf __maybe_unused _##var; \
+ struct print_mac_buf __maybe_unused *var = &_##var
+
+extern char *print_mac(struct print_mac_buf *buf, const u8 *addr);
#endif /* _LINUX_IF_ETHER_H */
diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
index 2aaf6fa..ad82613 100644
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c
@@ -338,10 +338,10 @@ struct net_device *alloc_etherdev_mq(int sizeof_priv,
unsigned int queue_count)
}
EXPORT_SYMBOL(alloc_etherdev_mq);
-char *print_mac(char *buf, const u8 *addr)
+char *print_mac(struct print_mac_buf *buf, const u8 *addr)
{
- sprintf(buf, MAC_FMT,
+ sprintf(buf->formatted_mac_addr, MAC_FMT,
addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
- return buf;
+ return buf->formatted_mac_addr;
}
EXPORT_SYMBOL(print_mac);
-
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