linux-kernel - Re: WARN_ON() which sometimes sucks

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Date:	Wed, 1 Aug 2007 11:17:15 -0400
From:	Joe Korty <joe.korty@...r.com>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Al Viro <viro@....linux.org.uk>,
	Alexey Dobriyan <adobriyan@...ru>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, herbert@...dor.apana.org.au
Subject: Re: WARN_ON() which sometimes sucks

On Wed, Aug 01, 2007 at 02:20:48PM +1000, Paul Mackerras wrote:
> Linus Torvalds writes:
> 
> > Umm. The WARN_ON() might actually get a "long long" value for all we know. 
> > Ie it's perfectly possible that the WARN_ON might look like
> > 
> > 	/* Must not have high bits on */
> > 	WARN_ON(offset & 0xffffffff00000000);
> > 
> > which on a 32-bit pcc would apparently do the wrong thing entirely as it 
> > stands now. No?
> 
> Actually, because of the typeof in the powerpc WARN_ON, I think it
> would fail to build since we'd be passing a long long value to an
> inline asm, or at least I hope it would fail to build. :)


Turning the condition into an integer should work ...

	#define NEW_WARN_ON(x) OLD_WARN_ON(!!(x))

Regards,
Joe

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