From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: sysfs_format_mac
Date: Tue, 16 Jul 2013 12:56:41 -0700 (PDT)
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I assume that the only reason sysfs_format_mac() exists at all, and
don't just use scnprintf() calls with "%pm\n", is that some devices
have MAC addresses which are not 6 bytes in length.

But it's such a waste to have this special case piece of code
just for that.

It would make so much more sense to allow specifying a length
specifier to %pm and friends.