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Date: Mon, 5 Apr 2010 15:12:59 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Joe Perches <joe@perches.com>
Cc: Randy Dunlap <randy.dunlap@oracle.com>, Jiri Kosina <trivial@kernel.org>,
       LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH V2] kernel.h: Convert rounding macros to statement
 expressions, add ADD_MOD
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On Mon, 29 Mar 2010 15:18:34 -0700
Joe Perches <joe@perches.com> wrote:

> Convert rounding macros to statement expressions
> so arguments are only evaluated once.
> Add kernel-doc to rounding macros
> Add ADD_MOD statement expression for "(x + y) % y"

In file included from /usr/src/devel/arch/x86/include/asm/cpumask.h:4,
                 from /usr/src/devel/arch/x86/include/asm/msr.h:18,
                 from /usr/src/devel/arch/x86/include/asm/processor.h:21,
                 from /usr/src/devel/arch/x86/include/asm/atomic.h:6,
                 from include/linux/crypto.h:20,
                 from arch/x86/kernel/asm-offsets_64.c:8,
                 from arch/x86/kernel/asm-offsets.c:4:
include/linux/cpumask.h:13: error: braced-group within expression allowed only inside a function
include/linux/cpumask.h:13: warning: no semicolon at end of struct or union
include/linux/cpumask.h:13: error: syntax error before numeric constant
include/linux/cpumask.h:13: warning: type defaults to 'int' in declaration of 'cpumask_t'
include/linux/cpumask.h:13: warning: data definition has no type or storage class
...

Some sort of dependency tangle I guess.