linux-kernel - Re: [RFC][PATCH] printk: Add %pb to print bitmaps

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Date:	Wed, 09 May 2012 07:19:42 -0700
From:	Joe Perches <joe@...ches.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Igor Mammedov <imammedo@...hat.com>,
	Jiang Liu <liuj97@...il.com>, linux-kernel@...r.kernel.org,
	pjt@...gle.com, tglx@...utronix.de, seto.hidetoshi@...fujitsu.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [RFC][PATCH] printk: Add %pb to print bitmaps

On Wed, 2012-05-09 at 15:59 +0200, Peter Zijlstra wrote:
> The current implementation limits both (field_width and precision) to
> s16, which will limit us to printing 32Kb bitmaps. If need arises we
> could increase printf_spec size I guess.

Not sure that's a problem really.
A single printk is limited to 1024 bytes.

> diff --git a/lib/vsprintf.c b/lib/vsprintf.c
[]
> @@ -941,6 +947,26 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
>  			return netdev_feature_string(buf, end, ptr, spec);
>  		}
>  		break;
> +	case 'b':
> +		{
> +			int bits, len;

trivia: a tab indent could be avoided by using
	case b: {


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