linux-kernel - Re: [RFC][PATCH] fix abs() macro to work with types wider than int

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Message-ID: <jehcr415i6.fsf@sykes.suse.de>
Date:	Wed, 25 Apr 2007 23:57:53 +0200
From:	Andreas Schwab <schwab@...e.de>
To:	"linux-os (Dick Johnson)" <linux-os@...logic.com>
Cc:	"John Anthony Kazos Jr." <jakj@...-k-j.com>,
	"Randy Dunlap" <randy.dunlap@...cle.com>,
	"Richard Knutsson" <ricknu-0@...dent.ltu.se>,
	"Jiri Bohac" <jbohac@...e.cz>, <akpm@...l.org>,
	"Linux kernel" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH] fix abs() macro to work with types wider than int

"linux-os (Dick Johnson)" <linux-os@...logic.com> writes:

> The original query was for a macro.

A macro that does not evaluate its argument more than once.  If you want
it to match the behaviour as defined by the C standard then it is not
allowed to do so.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@...e.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
PGP key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."
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