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From: Mike Travis <travis@sgi.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Yinghai Lu <yhlu.kernel@gmail.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	"H. Peter Anvin" <hpa@zytor.com>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	Dhaval Giani <dhaval@linux.vnet.ibm.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	linux-kernel@vger.kernel.org
Subject: Re: RFC [PATCH] x86: introduce nr_irqs for 64bit
Date: Wed, 30 Jul 2008 05:58:21 -0700	[thread overview]
Message-ID: <4890656D.4080906@sgi.com> (raw)
In-Reply-To: <20080730100926.GA10431@elte.hu>

Ingo Molnar wrote:
> * Yinghai Lu <yhlu.kernel@gmail.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@gmail.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


  parent reply	other threads:[~2008-07-30 12:58 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-07-29 21:14 [PATCH] x86: 64bit support more than 256 irq v2 Yinghai Lu
2008-07-29 22:16 ` Yinghai Lu
2008-07-29 23:22 ` Eric W. Biederman
2008-07-30  4:38 ` RFC [PATCH] x86: introduce nr_irqs for 64bit Yinghai Lu
2008-07-30 10:09   ` Ingo Molnar
2008-07-30 10:16     ` Yinghai Lu
2008-07-30 12:58     ` Mike Travis [this message]
2008-07-30 10:11   ` [PATCH] x86: introduce nr_irqs for 64bit v2 Yinghai Lu
2008-07-30 19:10     ` [PATCH 0/7] dyn_array support Yinghai Lu
2008-07-30 19:13       ` [PATCH 2/7] x86: introduce nr_irqs for 64bit v3 Yinghai Lu
2008-07-30 19:16       ` [PATCH 5/7] pci: make irq2_iommu to use dyn_array Yinghai Lu
2008-07-30 19:18       ` [PATCH 7/7] x86: make 64bit support dyn_array Yinghai Lu
2008-07-30 19:27       ` [PATCH 1/7] x86: 64bit support more than 256 irq v1 Yinghai Lu
2008-07-30 19:37       ` [PATCH 3/7] add dyn_array support Yinghai Lu
2008-07-30 19:40       ` [PATCH 6/7] irq: make irq_desc to use dyn_array Yinghai Lu
2008-07-30 19:40       ` [PATCH 4/7] random: make irq_timer_state " Yinghai Lu
2008-07-31  4:09       ` [PATCH 0/3] dyn_array support #2 Yinghai Lu
2008-07-31  4:10         ` [PATCH 1/3] serial: change irq_lists to use dyn_array Yinghai Lu
2008-07-31  5:58           ` Eric W. Biederman
2008-07-31  8:26           ` [PATCH] serial: change remove NR_IRQS in 8250.c Yinghai Lu
2008-07-31 11:50             ` Eric W. Biederman
2008-07-31 13:57               ` Alan Cox
2008-07-31 18:10                 ` Eric W. Biederman
2008-07-31 23:15                   ` Alan Cox
2008-08-01  3:20               ` Yinghai Lu
2008-07-31  4:11         ` [PATCH 2/3] add per_cpu_dyn_array support Yinghai Lu
2008-07-31  4:12         ` [PATCH 3/3] irq: make irqs in kernel stat use per_cpu_dyn_array Yinghai Lu
2008-07-31 10:14         ` [PATCH] x86 remove irq_vectors_limit.h Yinghai Lu
2008-07-31 16:32         ` [PATCH 0/3] dyn_array support #2 Mike Travis
2008-07-31 18:21           ` Yinghai Lu
2008-07-31 21:51         ` Peter Zijlstra
2008-07-31 22:07           ` Yinghai Lu
2008-07-31 22:25             ` Yinghai Lu
2008-08-01  3:52               ` Yinghai Lu
2008-07-31 22:14           ` Eric W. Biederman
2008-08-01 20:13       ` [PATCH 0/7] dyn_array support Eric W. Biederman

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