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

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Date:	Tue, 7 Apr 2009 07:59:41 -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, Linus Torvalds wrote:
> 
> 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?

IOW, does this (TOTALLY UNTESTED) patch work?

		Linus

---
 include/linux/compiler.h |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index 6faa7e5..cebfdcd 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -114,7 +114,9 @@ void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect);
  * "Define 'is'", Bill Clinton
  * "Define 'if'", Steven Rostedt
  */
-#define if(cond) if (__builtin_constant_p((cond)) ? !!(cond) :		\
+#define if(cond, ...) __trace_if( (cond , ## __VA_ARGS__) )
+#define __trace_if(cond) \
+	if (__builtin_constant_p((cond)) ? !!(cond) :			\
 	({								\
 		int ______r;						\
 		static struct ftrace_branch_data			\
--
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