linux-kernel - Re: [PATCH] debug: fix BUILD_BUG_ON() for non-constant expressions

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Date:	Wed, 20 Aug 2008 12:59:22 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Boaz Harrosh <bharrosh@...asas.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Sam Ravnborg <sam@...nborg.org>
Subject: Re: [PATCH] debug: fix BUILD_BUG_ON() for non-constant expressions


* Boaz Harrosh <bharrosh@...asas.com> wrote:

> If the user of virtio_has_feature() must pass a compile-time constant 
> then it must be converted to a MACRO, and then the BUILD_BUG_ON will 
> work. Or it should be changed to a BUG_ON() if fbit is a runtime 
> variable.

well, that's the question i'm asking: that sort of proposed 
BUILD_BUG_ON() variantcannot be used in inline functions like 
virtio_has_feature() does. If we get forced back to macros that's not an 
improvement.

Maybe the link-time last-line-of-defense mechanism i posed is the most 
flexible one perhaps after all? (it's ugly too but none of this is 
particularly pretty)

hm?

	Ingo
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