linux-kernel - Re: [PATCH 00/33] dyn_array and nr

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Message-ID: <20080807111216.6cfdbeea@lxorguk.ukuu.org.uk>
Date:	Thu, 7 Aug 2008 11:12:16 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	ebiederm@...ssion.com (Eric W. Biederman)
Cc:	"Yinghai Lu" <yhlu.kernel@...il.com>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Dhaval Giani" <dhaval@...ux.vnet.ibm.com>,
	"Mike Travis" <travis@....com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/33] dyn_array and nr_irqs support v4

On Wed, 06 Aug 2008 18:02:18 -0700
ebiederm@...ssion.com (Eric W. Biederman) wrote:

> Alan Cox <alan@...rguk.ukuu.org.uk> writes:
> 
> > A lot of these are range checks so could be replaced by a single
> > valid_irq(irq) test.
> 
> Yes.  My first impression was that with NR_IRQS dead valid_irq could
> easily become. #define valid_irq(irq) ((irq) != 0) 

Not really - there are lots of cases where we sanity check an IRQ passed
from user space or module parameter configuration. So we do actually need

	valid_irq(irq)		((irq) > 0 && (irq) < nr_irqs)

[or relevant per arch alternatives]

Alan
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