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

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Message-Id: <20120509120745.042e86c6.akpm@linux-foundation.org>
Date:	Wed, 9 May 2012 12:07:45 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Igor Mammedov <imammedo@...hat.com>, Jiang Liu <liuj97@...il.com>,
	linux-kernel@...r.kernel.org, mingo@...nel.org, pjt@...gle.com,
	tglx@...utronix.de, seto.hidetoshi@...fujitsu.com,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [RFC][PATCH] printk: Add %pb to print bitmaps

On Wed, 09 May 2012 15:27:23 +0200
Peter Zijlstra <peterz@...radead.org> wrote:

> + * - 'b' For a bitmap, consumes 2 args, second is int

There's a pretty widespread convention that %b is used to print in
binary: printf("%b", 10) -> 1010.  Regrettably it isn't part of
standard C, but it's often supported anyway.  Perl's printf does this
as well.  Perl uses %B also.

If we later want to add binary printing to kernel print(), we'd presumably
use %pb, to match this precedent.

So perhaps it would be better to avoid consuming `b' for bitmaps?
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