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

[Joe Perches]

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.