linux-kernel - Re: [IA64] Add mapping table between irq and vector

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Message-Id: <20070720131728.a7335d92.akpm@linux-foundation.org>
Date:	Fri, 20 Jul 2007 13:17:28 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
Cc:	linux-ia64@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [IA64] Add mapping table between irq and vector

On Fri, 20 Jul 2007 19:59:17 GMT
Linux Kernel Mailing List <linux-kernel@...r.kernel.org> wrote:

> +	BUG_ON(bind_irq_vector(irq, vector));

It's not good practice to do assert(expression-with-side-effects).  Because
if someone wants to create a build which has all the assertions disabled,
the resulting binary will not work.

In the present implementation our BUG_ON(expression) will evaluate
`expression' even if CONFIG_BUG=n.  But that's totally lame and we are just
leaving optimisation opportunities on the floor.

Our objective _should_ be to make BUG_ON(expr) generate no code at all if
CONFIG_BUG=n.

So please, prefer to do

	if (bind_irq_vector(irq, vector))
		BUG();

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