linux-kernel - Re: [PATCHv2 1/2] Print: Add print format for 8-byte EUI-64 type

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Date:	Wed, 09 Dec 2015 11:06:31 -0800
From:	Joe Perches <joe@...ches.com>
To:	Keith Busch <keith.busch@...el.com>,
	linux-nvme@...ts.infradead.org, LKML <linux-kernel@...r.kernel.org>
Cc:	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: [PATCHv2 1/2] Print: Add print format for 8-byte EUI-64 type

On Wed, 2015-12-09 at 11:42 -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.
[]
> diff --git a/Documentation/printk-formats.txt b/Documentation/printk-formats.txt
[]
> @@ -136,14 +136,21 @@ Raw buffer as a hex string:
>  MAC/FDDI addresses:
>  
>  	%pM	00:01:02:03:04:05
> +	%pMl	00:01:02:03:04:05:06:07
>  	%pMR	05:04:03:02:01:00
> +	%pMRl	07:06:05:04:03:02:01:00
>  	%pMF	00-01-02-03-04-05
> +	%pMFl	00-01-02-03-04-05-06-07
>  	%pm	000102030405
> +	%pml	0001020304050607
>  	%pmR	050403020100
> +	%pmRl	0706050403020100
[]
> diff --git a/lib/vsprintf.c b/lib/vsprintf.c
[]
> @@ -908,14 +908,21 @@ char *mac_address_string(char *buf, char *end, u8 *addr,
>  		separator = ':';
>  		break;
>  	}
> +	switch (fmt[2]) {
> +	case 'l':
> +		bytes = 8;
> +		break;
> +	default:
> +		break;
> +	}

This doesn't work for formats without pmR or pmF.
like "%pml" or "%pMl" as fmt[2] can be anything.

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