linux-kernel - Re: intel-iommu: Add for_each_iommu() and for_each_active

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Date:	Mon, 06 Apr 2009 18:19:06 -0700
From:	David Woodhouse <dwmw2@...radead.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: intel-iommu: Add for_each_iommu() and for_each_active_iommu()
 macros

On Mon, 2009-04-06 at 18:09 -0700, David Woodhouse wrote:
> 
> I'm unconvinced by the fix -- can we find a way to fix the if() macro so
> that normal (if fugly) C code like this doesn't doesn't need this kind
> of workaround?

Something like this perhaps? I'd reformat it but dinner calls...

diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index 6faa7e5..1da2e72 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -114,7 +114,7 @@ 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, ...) if (__builtin_constant_p((cond, ## __VA_ARGS__)) ? !!(cond, ## __VA_ARGS__) : \
 	({								\
 		int ______r;						\
 		static struct ftrace_branch_data			\
@@ -125,7 +125,7 @@ void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect);
 				.file = __FILE__,			\
 				.line = __LINE__,			\
 			};						\
-		______r = !!(cond);					\
+		______r = !!(cond, ## __VA_ARGS__);					\
 		______f.miss_hit[______r]++;					\
 		______r;						\
 	}))

-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse@...el.com                              Intel Corporation

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