linux-kernel - Re: [PATCH v11 04/10] iommu/vt-d: functions to copy data from old mem

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Message-ID: <20150513090035.GE3736@dhcp-128-28.nay.redhat.com>
Date:	Wed, 13 May 2015 17:00:35 +0800
From:	Baoquan He <bhe@...hat.com>
To:	"Li, Zhen-Hua" <zhen-hual@...com>
Cc:	dwmw2@...radead.org, indou.takao@...fujitsu.com, joro@...tes.org,
	vgoyal@...hat.com, dyoung@...hat.com,
	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, kexec@...ts.infradead.org,
	alex.williamson@...hat.com, ddutile@...hat.com,
	ishii.hironobu@...fujitsu.com, bhelgaas@...gle.com,
	doug.hatch@...com, jerry.hoemann@...com, tom.vaden@...com,
	li.zhang6@...com, lisa.mitchell@...com, billsumnerlinux@...il.com,
	rwright@...com
Subject: Re: [PATCH v11 04/10] iommu/vt-d: functions to copy data from old mem

On 05/11/15 at 05:52pm, Li, Zhen-Hua wrote:
> Add some functions to copy the data from old kernel.
> These functions are used to copy context tables and page tables.
> 
> To avoid calling iounmap between spin_lock_irqsave and spin_unlock_irqrestore,
> use a link here, store the pointers , and then use iounmap to free them in
> another place.

Hi Zhenhua,

I remember you mentioned iounmap will cause error inside
spin_lock_irqsave. Do you know why it happened now? And could you also
describe why avoid calling iounmap between
spin_lock_irqsave/unlock_irqsave  is needed here and what's the status
now? 

I think other reviewer may want to know it too.

Thanks
Baoquan

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