linux-kernel - Re: [PATCHv3 0/6] Crashdump Accepting Active IOMMU

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Message-ID: <20140304150611.GE2799@8bytes.org>
Date:	Tue, 4 Mar 2014 16:06:17 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	Bill Sumner <bill.sumner@...com>
Cc:	dwmw2@...radead.org, indou.takao@...fujitsu.com, bhe@...hat.com,
	iommu@...ts.linux-foundation.org, kexec@...ts.infradead.org,
	alex.williamson@...hat.com, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, ddutile@...hat.com,
	ishii.hironobu@...fujitsu.com, bhelgaas@...gle.com,
	doug.hatch@...com, zhenhua@...com
Subject: Re: [PATCHv3 0/6] Crashdump Accepting Active IOMMU

Hi Bill,

On Fri, Jan 10, 2014 at 03:07:26PM -0700, Bill Sumner wrote:
> Bill Sumner (6):
>   Crashdump-Accepting-Active-IOMMU-Flags-and-Prototype
>   Crashdump-Accepting-Active-IOMMU-Utility-functions
>   Crashdump-Accepting-Active-IOMMU-Domain-Interfaces
>   Crashdump-Accepting-Active-IOMMU-Copy-Translations
>   Crashdump-Accepting-Active-IOMMU-Debug-Print-IOMMU
>   Crashdump-Accepting-Active-IOMMU-Call-From-Mainline
> 
>  drivers/iommu/intel-iommu.c | 1293 ++++++++++++++++++++++++++++++++++++++++---
>  1 file changed, 1225 insertions(+), 68 deletions(-)

This is a pretty big change, before merging I would like to get more
eyes on it. Please make sure you get more reviews on the code and the
general concept. A few things I noticed while looking at it:

* You put a lot of code into #define CONFIG_CRASH_DUMP. Isn't the same
  approach necessary to for KEXEC?

* Please get rid of all the pr_debug stuff.

* I think it makes sense to put the functions to access the IOMMU
  configuration values of the old kernel into a new file. This is better
  than adding over 1000 new lines to intel-iommu.c

* I have seen your new single-patch for this change. A single patch with
  more than 1200 changed lines is not something anyone is willing to
  review. Please split the patches again in a meaningful and bisectable
  way.

Thanks,

	Joerg

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