linux-kernel - Re: [PATCH 06/10] x86: reduce memory and stack usage in intel

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Date:	Wed, 26 Mar 2008 09:59:01 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Mike Travis <travis@....com>
CC:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH 06/10] x86: reduce memory and stack usage in	intel_cacheinfo

Mike Travis wrote:
> Hmm, I hadn't thought of that.  There is commonly a format spec called
> %b for diags, etc. to print bit strings.  Maybe something like:
>
> 	"... %*b ...", nr_cpu_ids, ptr_to_bitmap
>
> where the length arg is rounded up to 32 or 64 bits...? 
>   

I think that would need to be %.*b, but I always need to try it both 
ways anyway...

But yes, that seems like the right way to go.

>> Eh?  What's the difference between snprintf and scnprintf?
>>     
>
> Good question... I'll have to ask the cpumask person. ;-)
>   

It's in generic lib/vsprintf.c.  The two functions are pretty much 
identical...  Oh, I see; snprintf returns the total output size, 
regardless of whether it fits into the provided buffer, but scnprintf 
returns the actual output size, clipped by the buffer length.

    J
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