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

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Date:	Wed, 09 May 2012 16:24:17 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	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 16:15 +0200, Ingo Molnar wrote:
> So, if someone specifies an incomplete "%pb" format - fmt[1] 
> will be 0 and we take precision as the length - presumably also 
> 0. 

yes, printf_spec is initialized to 0s.

> We stick that 0 into:
> 
> > +                     len = bitmap_scnlistprintf(buf, end - buf, ptr, bits);
> 
> Will that work? 

Yes, bitmap_scnlistprintf() will only set buf[0] = 0 (which will be
overwritten by a possible next printf token) and return 0 length not
advancing the ptr.


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