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

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Message-ID: <56C1FCF5.804@sr71.net>
Date:	Mon, 15 Feb 2016 08:29:41 -0800
From:	Dave Hansen <dave@...1.net>
To:	Balbir Singh <bsingharora@...il.com>, 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 02/14/2016 10:09 PM, Balbir Singh wrote:
>> > 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?

Yes, exactly.