linux-kernel - Re: [PATCH v2 12/26] x86, irq: Add realloc_irq_and_cfg

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Date:	Fri, 8 Mar 2013 23:22:43 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, Joerg Roedel <joro@...tes.org>,
	Sebastian Andrzej Siewior <sebastian@...akpoint.cc>
Subject: Re: [PATCH v2 12/26] x86, irq: Add realloc_irq_and_cfg_at()

On Fri, Mar 8, 2013 at 11:53 AM, Konrad Rzeszutek Wilk
<konrad.wilk@...cle.com> wrote:
>> + * irq_realloc_desc - allocate irq descriptor for irq that is already reserved
>
> Which begs the question - why was it not allocated when it was reserved?

The reasons for not allocating them during reserving:
1. only several pins in ioapic are used, allocate for them pin, will
   waste memory for not used one.
2. relocate later could make sure irq_desc is allocated on local node ram.

Thanks

Yinghai
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