linux-kernel - Re: [PATCH] iommu/amd: Take mmap_sem when calling get_user

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Message-ID: <20140506181438.GD12376@8bytes.org>
Date:	Tue, 6 May 2014 20:14:39 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	suravee.suthikulpanit@....com
Cc:	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	kim.naru@....com, jay.cornwall@....com
Subject: Re: [PATCH] iommu/amd: Take mmap_sem when calling get_user_pages

On Mon, Apr 28, 2014 at 05:27:46PM -0500, Suthikulpanit, Suravee wrote:
> From: Jay Cornwall <jay.cornwall@....com>
> 
> get_user_pages requires caller to hold a read lock on mmap_sem.

Right, but can't we just switch to get_user_pages_fast instead?


	Joerg


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