linux-kernel - Re: [PATCH] printk-formats.txt documentation update

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Date:	Sun, 6 Feb 2011 10:07:45 +0000
From:	Andrew Murray <amurray@...data.com>
To:	Joe Perches <joe@...ches.com>
Cc:	linux-embedded@...r.kernel.org,
	linux kernel <linux-kernel@...r.kernel.org>,
	Jiri Kosina <trivial@...nel.org>
Subject: Re: [PATCH] printk-formats.txt documentation update

Thanks for the feedback - I will truncate to 80 characters and
implement Joe's advice.

Thanks,

Andrew Murray

On 6 February 2011 00:37, Joe Perches <joe@...ches.com> wrote:
> On Sun, 2011-02-06 at 00:15 +0000, Andrew Murray wrote:
>> From: Andrew Murray <amurray@...-data.co.uk>
>> This patch updates the incomplete documentation concerning the printk
>> extended format specifiers.
>> Signed-off-by: Andrew Murray <amurray@...-data.co.uk>
>> ---
>> diff --git a/Documentation/printk-formats.txt b/Documentation/printk-formats.txt
> []
>> @@ -9,7 +9,42 @@ If variable is of Type,              use printk format specifier:
>>               size_t                  %zu or %zx
>>               ssize_t                 %zd or %zx
>>
>> -Raw pointer value SHOULD be printed with %p.
>> +Raw pointer value SHOULD be printed with %p. The kernel supports
>> +the following extended format specifiers for pointer types:
>
> I think it'd be better if each extension were individually described
> with an example output.
>
>> +
>> +     General:
>> +
>> +     %pF     function pointer with offset, e.g. module_start
>> +     %pf     function pointer without offset, e.g. module_start+0x0/0x62 [hello]
>
> with/without inversion?
>
>> +     %pS     text symbol with offset
>> +     %ps     text symbol without offset
>> +     %pR     struct resource with decoded flags, e.g. [mem 0x0-0x1f 64 bit pref]
>> +     %pr     struct resource with raw flags, e.g. [mem 0x0-0x1f flags 0x201]
>> +
>> +     MAC/FDDI addresses:
>> +
>> +     %pM     colon-seperated 6-byte MAC address in hex notation, e.g. 00:01:02:03:04:05
>
> spelling: separated
>
>> +     %pm     non-colon-seperated 6-byte MAC address is hex notation, e.g. 000102030405
>> +     %pMF    6-byte dash-separated FDDI hex notation
>> +
>> +     IPv4 addresses:
>> +
>> +     %pI4    IPv4 dot-seperated decimal without leading 0's, e.g. 1.2.3.4
>> +     %pi4    IPv4 dot-seperated decimal with leading 0's, 001.002.003.004
>> +     %p[Ii]4[hl] IPv4 dot-seperated decimal with/without leading 0's for
>> +             host (h), little (l) or network/big (default) endian order
>> +
>> +     IPv6 addresses:
>> +     %pI6    IPv6 colon-seperated network-order 16 bit hex with leading 0's,
>> +             e.g. 0001:0203:...:0708
>> +     %pi6    IPv6 non-colon-seperated network-order 16 bit hex with leading 0's,
>> +             e.g. 000102...0f
>> +     %pI6c   IPv6 address as described by
>> +             http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00,
>> +             e.g. 1::708
>> +
>> +     %pU[bBlL] 16 byte UUID/GUID in big or little endian using lower or upper case
>
> Maybe a simple 2 line table without the e.g.:
>
>        %p<extension1>  sample output1
>                        description1
>        %p<extension2>  sample output2
>                        description2
>
>
>



-- 
Andrew Murray, Embedded Linux Group
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