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

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Date:	Thu, 7 Aug 2008 03:51:48 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Alan Cox" <alan@...rguk.ukuu.org.uk>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.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 Thu, Aug 7, 2008 at 3:12 AM, Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
> 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]

#ifndef CONFIG_HAVE_SPARSE_IRQ
#define   valid_irq(irq)          ((irq) > 0 && (irq) < nr_irqs)
#else
#define   valid_irq(irq)          ((irq) > 0)

anyway why 0 is invalid instead of -1U...?

YH


#endif
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