linux-kernel - Re: [PATCHv3] printf: Add format for 8-byte EUI-64 type

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Message-ID: <20151210150609.GA23337@localhost.localdomain>
Date:	Thu, 10 Dec 2015 15:06:09 +0000
From:	Keith Busch <keith.busch@...el.com>
To:	Joe Perches <joe@...ches.com>
Cc:	linux-nvme@...ts.infradead.org,
	LKML <linux-kernel@...r.kernel.org>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jens Axboe <axboe@...com>,
	Christoph Hellwig <hch@...radead.org>,
	Dan Williams <dan.j.williams@...el.com>
Subject: Re: [PATCHv3] printf: Add format for 8-byte EUI-64 type

On Wed, Dec 09, 2015 at 03:21:40PM -0800, Joe Perches wrote:
> On Wed, 2015-12-09 at 16:06 -0700, Keith Busch wrote:
> > MAC addresses may be formed using rules based on EUI-64, which is 2 bytes
> > longer than a typical 6-byte MAC. This patch adds a long specifier to
> > the %pM format to support the extended unique identifier.
> > 
> > Since there are multiple valid possible permutations of format specifiers,
> > the decoding is done in a loop, and the default ':' separator is
> > initialized at declaration time. A side effect of this allows 'F' and
> > 'R' both be specified, so these are appended to the documentation.
> 
> Just thought of this:
> 
> An alternative is using a format of "%8phC"
> 
> Is there a use case for a bluetooth or FDDI EUI-64?

*facepalm*

I didn't know that format, but it satisfies my needs. I am not aware of
bluetooth or fddi using eui64, so I've no problem withdrawing the patch.
I'll just fix up the one that depended on it.
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