linux-kernel - Re: [PATCH 3/11] ksm: trivial tidyups

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Date:	Mon, 28 Jan 2013 17:44:23 -0800 (PST)
From:	Hugh Dickins <hughd@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Petr Holasek <pholasek@...hat.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Izik Eidus <izik.eidus@...ellosystems.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 3/11] ksm: trivial tidyups

On Mon, 28 Jan 2013, Andrew Morton wrote:
> On Fri, 25 Jan 2013 17:58:11 -0800 (PST)
> Hugh Dickins <hughd@...gle.com> wrote:
> 
> > +#ifdef CONFIG_NUMA
> > +#define NUMA(x)		(x)
> > +#define DO_NUMA(x)	(x)
> 
> Did we consider
> 
> 	#define DO_NUMA do { (x) } while (0)
> 
> ?

It didn't occur to me at all.  I like that it makes more sense of
the DO_NUMA variant.  Is it okay that, to work with the way I was
using it, we need "(x);" in there rather than just "(x)"?

> 
> That could avoid some nasty config-dependent compilation issues.
> 
> > +#else
> > +#define NUMA(x)		(0)

[PATCH] ksm: trivial tidyups fix

Suggested by akpm: make DO_NUMA(x) do { (x); } while (0) more like the #else.

Signed-off-by: Hugh Dickins <hughd@...gle.com>
---

 mm/ksm.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- mmotm.org/mm/ksm.c	2013-01-27 09:55:45.000000000 -0800
+++ mmotm/mm/ksm.c	2013-01-28 16:50:25.772026446 -0800
@@ -43,7 +43,7 @@
 
 #ifdef CONFIG_NUMA
 #define NUMA(x)		(x)
-#define DO_NUMA(x)	(x)
+#define DO_NUMA(x)	do { (x); } while (0)
 #else
 #define NUMA(x)		(0)
 #define DO_NUMA(x)	do { } while (0)
--
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