linux-kernel - Re: [PATCH] of: Custom printk format specifier for device node

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Message-Id: <B282C7F7-D221-4D7D-AB33-533C0204C4CF@konsulko.com>
Date:	Tue, 20 Jan 2015 20:06:15 +0200
From:	Pantelis Antoniou <pantelis.antoniou@...sulko.com>
To:	Joe Perches <joe@...ches.com>
Cc:	Rob Herring <robherring2@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Randy Dunlap <rdunlap@...radead.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] of: Custom printk format specifier for device node

Hi Joe,

> On Jan 20, 2015, at 19:59 , Joe Perches <joe@...ches.com> wrote:
> 
> On Tue, 2015-01-20 at 16:52 +0200, Pantelis Antoniou wrote:
>> Hi Rob,
>> 
>>> On Jan 20, 2015, at 16:47 , Rob Herring <robherring2@...il.com> wrote:
>>> 
>>> On Tue, Jan 20, 2015 at 8:34 AM, Pantelis Antoniou
>>> <pantelis.antoniou@...sulko.com> wrote:
>>>> 90% of the usage of device node's full_name is printing it out
>>>> in a kernel message. Preparing for the eventual delayed allocation
>>>> introduce a custom printk format specifier that is both more
>>>> compact and more pleasant to the eye.
> []
>>>> diff --git a/Documentation/printk-formats.txt b/Documentation/printk-formats.txt
> []
>>>> +Device tree nodes:
>>>> +
>>>> +       %pO{,1,2}
>>> 
>>> 'O' is not very obvious, but I imagine we are somewhat limted in our
>>> choice here?
>>> 
>> 
>> All the good women are married, all the handsome men are gay, all the obvious
>> format specifiers are taken.
> 
> Not really at all.
> 
> I quite dislike '0' as the format type specifier for
> a device tree node as there's no mnemonic mapping.
> 

There’s only so many characters one can use; [DdNn] are taken. And it’s O != 0.

I am open to suggestions.

Regards

— Pantelis

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