linux-kernel - Re: Conversion to generic boolean

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Date:	Mon, 28 Aug 2006 22:55:07 +0200
From:	Richard Knutsson <ricknu-0@...dent.ltu.se>
To:	Nicholas Miell <nmiell@...cast.net>
CC:	Jan Engelhardt <jengelh@...ux01.gwdg.de>,
	Christoph Hellwig <hch@...radead.org>,
	James.Bottomley@...elEye.com, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Conversion to generic boolean

Nicholas Miell wrote:

>On Mon, 2006-08-28 at 14:17 +0200, Richard Knutsson wrote:
>  
>
>>Jan Engelhardt wrote:
>>
>>    
>>
>>>>>Just would like to ask if you want patches for:
>>>>>     
>>>>>
>>>>>          
>>>>>
>>>>Total NACK to any of this boolean ididocy.  I very much hope you didn't
>>>>get the impression you actually have a chance to get this merged.
>>>>
>>>>   
>>>>
>>>>        
>>>>
>>>>>* (Most importent, may introduce bugs if left alone)
>>>>>Fixing boolean checking, ex:
>>>>>if (bool == FALSE)
>>>>>to
>>>>>if (!bool)
>>>>>     
>>>>>
>>>>>          
>>>>>
>>>>this one of course makes sense, but please do it without introducing
>>>>any boolean type.  Getting rid of all the TRUE/FALSE defines and converting
>>>>all scsi drivers to classic C integer as boolean semantics would be
>>>>very welcome janitorial work.
>>>>   
>>>>
>>>>        
>>>>
>>>I don't get it. You object to the 'idiocy' 
>>>(http://lkml.org/lkml/2006/7/27/281), but find the x==FALSE -> !x 
>>>a good thing?
>>> 
>>>
>>>      
>>>
>>That is error-prone. Not "==FALSE" but what happens if x is (for some 
>>reason) not 1 and then "if (x==TRUE)".
>>    
>>
>
>If you're using _Bool, that isn't possible. (Except at the boundaries
>where you have to validate untrusted data -- and the compiler makes that
>more difficult, because it "knows" that a _Bool can only be 0 or 1 and
>therefore your check to see if it's not 0 or 1 can "safely" be
>eliminated.)
>  
>
Yes, true. But there is no _Bool's in the kernel (linus-git), only one 
in script/.

Richard Knutsson
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