From: Giacomo Catenazzi <cate@debian.org>
To: Andreas Dilger <adilger@turbolabs.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [CHECKER] Is this a bug?
Date: Fri, 02 Nov 2001 11:09:49 +0100 [thread overview]
Message-ID: <3BE270ED.7050109@debian.org> (raw)
In-Reply-To: <fa.l396uov.18jgog6@ifi.uio.no> <fa.dvj9vsv.1b4k8ip@ifi.uio.no>
>
> Also (in a separate patch at the end) is the removal of a whole bunch of:
>
> #ifdef IP2DEBUG_TRACE
> ip2trace(foo);
> #endif
>
> and replacing it with (the Linus-preferred, and far cleaner):
>
> #ifdef IP2DEBUG_TRACE
> void ip2trace(foo)
> #else
> #define ip2trace(foo) do {} while (0)
> #endif
>
Why in Linux we use "do {} while (0)" instead of the
standard "(void)0" ?
(standard = as normal libc in <assert.h>)
do while(0) is used for multiple statment macro to avoid problem
in if-else, not for empty instructions.
giacomo
next parent reply other threads:[~2001-11-02 9:01 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <fa.l396uov.18jgog6@ifi.uio.no>
[not found] ` <fa.dvj9vsv.1b4k8ip@ifi.uio.no>
2001-11-02 10:09 ` Giacomo Catenazzi [this message]
2001-11-01 19:13 [CHECKER] Is this a bug? Ken Ashcraft
2001-11-01 22:42 ` Andreas Dilger
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