linux-kernel - Re: [PATCH 01/33] mm: introduce get_user_pages

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Message-ID: <1455516578.16012.27.camel@gmail.com>
Date:	Mon, 15 Feb 2016 17:09:38 +1100
From:	Balbir Singh <bsingharora@...il.com>
To:	Dave Hansen <dave@...1.net>, linux-kernel@...r.kernel.org
Cc:	linux-mm@...ck.org, x86@...nel.org, torvalds@...ux-foundation.org,
	dave.hansen@...ux.intel.com, srikar@...ux.vnet.ibm.com,
	vbabka@...e.cz, akpm@...ux-foundation.org,
	kirill.shutemov@...ux.intel.com, aarcange@...hat.com,
	n-horiguchi@...jp.nec.com, jack@...e.cz
Subject: Re: [PATCH 01/33] mm: introduce get_user_pages_remote()

On Fri, 2016-02-12 at 13:01 -0800, Dave Hansen wrote:
> From: Dave Hansen <dave.hansen@...ux.intel.com>
> 
> For protection keys, we need to understand whether protections
> should be enforced in software or not.  In general, we enforce
> protections when working on our own task, but not when on others.
> We call these "current" and "remote" operations.
> 
> This patch introduces a new get_user_pages() variant:
> 
>         get_user_pages_remote()
> 
> Which is a replacement for when get_user_pages() is called on
> non-current tsk/mm.
> 

In summary then get_user_pages_remote() do not enforce protections?

Balbir Singh.