linux-kernel - Re: [PATCH v11 07/10] iommu/vt-d: enable kdump support in iommu module

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Message-ID: <5552B6B4.5080206@hp.com>
Date:	Wed, 13 May 2015 10:28:04 +0800
From:	"Li, ZhenHua" <zhen-hual@...com>
To:	Baoquan He <bhe@...hat.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, "Li, ZhenHua" <zhen-hual@...com>
Subject: Re: [PATCH v11 07/10] iommu/vt-d: enable kdump support in iommu module

>> +static u8 g_translation_pre_enabled;
> Hi Zhenhua,
>
> I haven't checked patch one by one, am going through the code flow.
>
> About g_translation_pre_enabled, I don't think it's necessary to define
> it as a global variable. Both its assignment and judgement are in
> init_dmars(). In this situation a local variable translation_pre_enabled
> in init_dmars() is enough.
>
> You can assign value to it here:
>
> 		iommu_check_pre_te_status(iommu);
> 		if (iommu->pre_enabled_trans) {
> 			translation_pre_enabled = 1;
> 			...
> 		}
>
> Thanks
> Baoquan
>
Hi Baoquan,
This variable is only be used in this file, for it is defined as static.
Till now, I think both global and local variable are fine, got the same
thing.
But I believe global is better, because if other functions want to know 
whether translation is enabled, this global variable is a good choice.

Thanks
Zhenhua





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