linux-kernel - Re: [PATCH 16/16] fix handling of integer constant expressions

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Message-ID: <alpine.LFD.0.98.0706271043570.8675@woody.linux-foundation.org>
Date:	Wed, 27 Jun 2007 10:45:55 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Al Viro <viro@....linux.org.uk>
cc:	Neil Booth <neil@...kokuya.co.uk>,
	Josh Triplett <josh@...edesktop.org>,
	Segher Boessenkool <segher@...nel.crashing.org>,
	linux-kernel@...r.kernel.org, linux-sparse@...r.kernel.org
Subject: Re: [PATCH 16/16] fix handling of integer constant expressions



On Wed, 27 Jun 2007, Al Viro wrote:
> 
> Eh...  I'd say that my variant for offsetof() is simply better - it usually
> directly turns into EXPR_VALUE, right in place, without rather convoluted
> work.  Aside of "should such cast be a constant integer expression"...

Umm. But sparse is meant to parse C code. Which very much includes *other* 
projects.

The kernel, for example, has its own offsetof. And yes, these days we use 
"__compiler_offsetof()", but we used to do

	#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)

and I seriously doubt that the kernel is the only one doing things like 
that.

		Linus
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