linux-kernel - Re: [PATCH] intel-iommu: fix build with CONFIG_BRANCH

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Date:	Tue, 7 Apr 2009 07:54:39 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	David Woodhouse <dwmw2@...radead.org>
cc:	Ingo Molnar <mingo@...e.hu>, iommu@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] intel-iommu: fix build with CONFIG_BRANCH_TRACER=y



On Tue, 7 Apr 2009, David Woodhouse wrote:
> 
> But it's a workaround, not a fix -- if we're going to #define if() then
> we should damn well make it transparent, and not have to work around
> breakage in arbitrary places.
> 
> Hence the patch I sent to Linus last night, which fixes it in the
> _right_ place:
> 	http://marc.info/?l=linux-kernel&m=123907505308502&w=2

Oh, Gods. 

It's definitely better in the sense that if we define 'if()', we should 
give it proper C semantics, but it's in some ways even uglier.

Can we please do it something like the following instead:

	#define if(a, ...) \
		__trace_if( (a, ## __VA_ARGS__) )

so that you don't need to do that ", ## __VA_ARGS__" thing three times?

		Linus
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