linux-kernel - Re: [PATCH] iqrdomain: Improve formatting in debugfs.

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Date:	Wed, 11 Apr 2012 08:33:33 -0700
From:	David Daney <ddaney.cavm@...il.com>
To:	Grant Likely <grant.likely@...retlab.ca>
CC:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, David Daney <david.daney@...ium.com>
Subject: Re: [PATCH] iqrdomain: Improve formatting in debugfs.

On 04/11/2012 12:03 AM, Grant Likely wrote:
> On Mon,  9 Apr 2012 17:06:57 -0700, David Daney<ddaney.cavm@...il.com>  wrote:
>> From: David Daney<david.daney@...ium.com>
>>
>> The irq_domain_mapping file has some interesting output when chip_data
>> contains leading zeros:
>>
>> virq   hwirq    chip name        chip data           domain name
>> .
>> .
>> .
>>    103  0x00000  CIU2-W           0x 5e0000000000000  none
>>    104  0x00000  CIU2-W           0x 5f0000000000000  none
>>    105  0x00000  CIU2-M           0x          (null)  none
>>    113  0x00000  CIU2-E           0x1080000000000000  none
>> .
>> .
>> .
>>
>> I think there should be no space in there between the "0x" and the
>> rest.  Also the '(null)' entry doesn't make much sense at all with a
>> "0x".
>
> Yeah, it doesn't make much sense with the '0x', but I don't want to
> supress the (null) output because it is really important to highlight
> when a domain isn't assigned to an active irq.
>
> Fixing the zero pad is trivial to fix though.  Just remove the
> precision from the %p format.  Here's my counter-patch:

This is good too.

FWIW:
Acked-by: David Daney <david.daney@...ium.com>


>
> ---
>
> diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
> index 9310a8d..eb05e40 100644
> --- a/kernel/irq/irqdomain.c
> +++ b/kernel/irq/irqdomain.c
> @@ -643,8 +643,8 @@ static int virq_debug_show(struct seq_file *m, void *private)
>   	void *data;
>   	int i;
>
> -	seq_printf(m, "%-5s  %-7s  %-15s  %-18s  %s\n", "virq", "hwirq",
> -		      "chip name", "chip data", "domain name");
> +	seq_printf(m, "%-5s  %-7s  %-15s  %-*s  %s\n", "irq", "hwirq",
> +		      "chip name", 2 * sizeof(void *) + 2, "chip data", "domain name");
>
>   	for (i = 1; i<  nr_irqs; i++) {
>   		desc = irq_to_desc(i);
> @@ -667,7 +667,7 @@ static int virq_debug_show(struct seq_file *m, void *private)
>   			seq_printf(m, "%-15s  ", p);
>
>   			data = irq_desc_get_chip_data(desc);
> -			seq_printf(m, "0x%16p  ", data);
> +			seq_printf(m, data ? "0x%p  " : "  %p  ", data);
>
>   			if (desc->irq_data.domain&&  desc->irq_data.domain->of_node)
>   				p = desc->irq_data.domain->of_node->full_name;

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