aoe: mac_addr: avoid 64-bit arch compiler warnings

By returning unsigned long long, mac_addr does not generate compiler warnings
on 64-bit architectures.

Signed-off-by: Ed L. Cashin <ecashin@coraid.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/block/aoe/aoe.h

@@ -198,4 +198,4 @@ void aoenet_xmit(struct sk_buff *);
 int is_aoe_netif(struct net_device *ifp);
 int set_aoe_iflist(const char __user *str, size_t size);
 
-u64 mac_addr(char addr[6]);
+unsigned long long mac_addr(char addr[6]);

drivers/block/aoe/aoeblk.c

@@ -37,8 +37,7 @@ static ssize_t aoedisk_show_mac(struct device *dev,
 
 	if (t == NULL)
 		return snprintf(page, PAGE_SIZE, "none\n");
-	return snprintf(page, PAGE_SIZE, "%012llx\n",
-			(unsigned long long)mac_addr(t->addr));
+	return snprintf(page, PAGE_SIZE, "%012llx\n", mac_addr(t->addr));
 }
 static ssize_t aoedisk_show_netif(struct device *dev,
 				  struct device_attribute *attr, char *page)

drivers/block/aoe/aoecmd.c

@@ -309,7 +309,8 @@ resend(struct aoedev *d, struct aoetgt *t, struct frame *f)
 		"%15s e%ld.%d oldtag=%08x@%08lx newtag=%08x "
 		"s=%012llx d=%012llx nout=%d\n",
 		"retransmit", d->aoemajor, d->aoeminor, f->tag, jiffies, n,
-		mac_addr(h->src), mac_addr(h->dst), t->nout);
+		mac_addr(h->src),
+		mac_addr(h->dst), t->nout);
 	aoechr_error(buf);
 
 	f->tag = n;
@@ -633,7 +634,7 @@ ataid_complete(struct aoedev *d, struct aoetgt *t, unsigned char *id)
 
 	if (d->ssize != ssize)
 		printk(KERN_INFO "aoe: %012llx e%lu.%lu v%04x has %llu sectors\n",
-			(unsigned long long)mac_addr(t->addr),
+			mac_addr(t->addr),
 			d->aoemajor, d->aoeminor,
 			d->fw_ver, (long long)ssize);
 	d->ssize = ssize;
@@ -727,8 +728,7 @@ aoecmd_ata_rsp(struct sk_buff *skb)
 	t = gettgt(d, hin->src);
 	if (t == NULL) {
 		printk(KERN_INFO "aoe: can't find target e%ld.%d:%012llx\n",
-			d->aoemajor, d->aoeminor,
-			(unsigned long long) mac_addr(hin->src));
+			d->aoemajor, d->aoeminor, mac_addr(hin->src));
 		spin_unlock_irqrestore(&d->lock, flags);
 		return;
 	}
@@ -1003,7 +1003,7 @@ aoecmd_cfg_rsp(struct sk_buff *skb)
 				"aoe: e%ld.%d: setting %d%s%s:%012llx\n",
 				d->aoemajor, d->aoeminor, n,
 				" byte data frames on ", ifp->nd->name,
-				(unsigned long long) mac_addr(t->addr));
+				mac_addr(t->addr));
 			ifp->maxbcnt = n;
 		}
 	}

drivers/block/aoe/aoenet.c

@@ -83,7 +83,7 @@ set_aoe_iflist(const char __user *user_str, size_t size)
 	return 0;
 }
 
-u64
+unsigned long long
 mac_addr(char addr[6])
 {
 	__be64 n = 0;
@@ -91,7 +91,7 @@ mac_addr(char addr[6])
 
 	memcpy(p + 2, addr, 6);	/* (sizeof addr != 6) */
 
-	return __be64_to_cpu(n);
+	return (unsigned long long) __be64_to_cpu(n);
 }
 
 void