linux-kernel - Re: linux-next: manual merge of the cleancache tree with Linus' tree

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Message-Id: <20110323234224.f4ceebd4.akpm@linux-foundation.org>
Date:	Wed, 23 Mar 2011 23:42:24 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Minchan Kim <minchan.kim@...il.com>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	Dan Magenheimer <dan.magenheimer@...cle.com>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Linus <torvalds@...ux-foundation.org>
Subject: Re: linux-next: manual merge of the cleancache tree with Linus'
 tree

On Thu, 24 Mar 2011 14:58:06 +0900 Minchan Kim <minchan.kim@...il.com> wrote:

> Dan, one more thing.
> 
> #define cleancache_fs_enabled_mapping(_mapping) \
>         (mapping->host->i_sb->cleancache_poolid >= 0)
> 
> One is "_mapping", another is  "mapping"

It should be implemented in C too.  This is the case for almost all
"functions" which are implemented as macros and it's rather a mystery
why we keep on typing #define!

It is not only for cleanliness and for typechecking, but also because
constructs such as

	{
		struct address_space *foo = ...;
		if (cleancache_fs_enabled_mapping(foo))
			...;
	}

will generate an unused-var warning against `foo' if CONFIG_CLEANCACHE=n. 
Implementing the function in C fixes that.  With current gcc, anyway.		
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