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

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Date:	Wed, 30 Jul 2008 03:16:30 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Thomas Gleixner" <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Eric W. Biederman" <ebiederm@...ssion.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: RFC [PATCH] x86: introduce nr_irqs for 64bit

On Wed, Jul 30, 2008 at 3:09 AM, Ingo Molnar <mingo@...e.hu> 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.
>
> Also add an CONFIG_ARCH_HAS_DYNAMIC_NR_IRQS switch, define it in
> arch/x86/Kconfig and use it in include/linux/irq.h.
>
> This will create far less migration pain than the widespread rename.
> That will also solve the "what about the other architectures" question.

just send out v2.

long term, i hope to make all arch to use nr_irqs and probe it
earlier. and kill NR_IRQS

YH
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