linux-kernel - Re: [RFC][PATCH] bitfields API

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Message-ID: <48B71093.3070409@cs.helsinki.fi>
Date:	Thu, 28 Aug 2008 23:54:43 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Adrian Bunk <bunk@...nel.org>
CC:	Alexey Dobriyan <adobriyan@...il.com>,
	Vegard Nossum <vegard.nossum@...il.com>,
	David Miller <davem@...emloft.net>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH] bitfields API

Adrian Bunk wrote:
>> Heh, heh, one alternative is to have a kmemcheck_memset() thingy that  
>> unconditionally zeroes bit fields and maybe is a no-op when kmemcheck is  
>> disabled.
> 
> This sounds as if this might cause bugs to disappear when debugging gets 
> turned on?

Yeah, I suppose. The problem doing that unconditionally is that it 
increases kernel text slightly on some architectures (e.g. sparc). 
However, as long as you use the KMEMCHECK_BIT_FIELD annotation only in 
places that give you false positives, it's we should be safe.

		Pekka
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