linux-ext4 - Re: [PATCH] ext2: conditional removal of NFSD code

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Date:	Sat, 6 Jan 2007 21:52:25 +0000
From:	Al Viro <viro@....linux.org.uk>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	Matthew Wilcox <matthew@....cx>, akpm@...l.org,
	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
	David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH] ext2: conditional removal of NFSD code

On Sun, Jan 07, 2007 at 12:44:56AM +0300, Alexey Dobriyan wrote:
> > #if defined(CONFIG_EXPORTFS) || defined(CONFIG_EXPORTFS_MODULE)
> > #define set_export_ops(sb, ops)		sb->s_export_op = ops
> > #else
> > #define set_export_ops(sb, ops)		0
> > #endif
> >
> > That way you can get rid of the function pointer from the struct
> > superblock too.
> 
> Exactly! I've just started with filesystems I use.
> 
> it should be wrapped in do {} while 0, of course.

What the hell for?  Repeat after me:
	* do {} while(0) is always inferior to ((void)0)
	* do { expr; } while(0) is always inferior to ((void)(expr))
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