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Date: Fri, 03 Dec 2010 20:12:25 +0200
From: Andriy Gapon <avg@freebsd.org>
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To: Bruce Evans <brde@optusnet.com.au>
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Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org,
	src-committers@freebsd.org, Bruce Cran <brucec@freebsd.org>
Subject: Re: svn commit: r216143 - in head: share/man/man9 sys/amd64/include
 sys/arm/include sys/i386/include sys/ia64/include sys/mips/include
 sys/pc98/include
 sys/powerpc/include sys/sparc64/include sys/sun4v...
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on 03/12/2010 20:01 Bruce Evans said the following:
> On Fri, 3 Dec 2010, Bruce Cran wrote:
> 
>> Log:
>>  Revert r216134. This checkin broke platforms where bus_space are macros:
>>  they need to be a single statement, and do { } while (0) doesn't work in this
>>  situation so revert until a solution can be devised.
> 
> Surprising that do-while doesn't work.

I think GCC extension that allows to put statements inside expressions could help
here:
http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement-Exprs

I think that we already use the extension in some places.
-- 
Andriy Gapon