linux-kernel - Re: RFC [PATCH] x86: introduce nr

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Date:	Wed, 30 Jul 2008 05:58:21 -0700
From:	Mike Travis <travis@....com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Yinghai Lu <yhlu.kernel@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: RFC [PATCH] x86: introduce nr_irqs for 64bit

Ingo Molnar wrote:
> * Yinghai Lu <yhlu.kernel@...il.com> wrote:
> 
>> add DEFINE_DYN_ARRAY for dynamical array support
>>
>> todo:
>> 1. convert x86 32bit and other arch
>> 2. nr_irqs auto probe via acpi_oem_check?
>>
>> Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>
> 
> wonderful!
> 
> I have one main structural suggestion: could we please keep the NR_IRQS 
> name, and just change it to dynamic on x86? NR_IRQS is used in 540 
> places in the kernel, there's no point in touching all that code.

Good thought.
> 
> Also add an CONFIG_ARCH_HAS_DYNAMIC_NR_IRQS switch, define it in 
> arch/x86/Kconfig and use it in include/linux/irq.h.

It could also revert DEFINE_DYN_ARRAY to a fixed array for more
compact code in small machines.

Thanks,
Mike
> 
> This will create far less migration pain than the widespread rename. 
> That will also solve the "what about the other architectures" question.
> 
> 	Ingo

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