linux-kernel - Re: [PATCH 1/1] Document get_user_pages

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Message-Id: <20090410131200.793C.A69D9226@jp.fujitsu.com>
Date:	Fri, 10 Apr 2009 13:13:59 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Grover <andy.grover@...cle.com>,
	linux-kernel@...r.kernel.org, mingo@...hat.com, npiggin@...e.de
Subject: Re: [PATCH 1/1] Document get_user_pages_fast()

> > > and Cow change owner process.
> > 
> > hm.  buggy userspace? Why is that a problem from a kernel perspective?
> 
> We already started to discuttion in "[PATCH] fork vs gup(-fast) fix" thread.
> but this is very difficult problem. it is still in progress ;)

note:
access_process_vm() tell us right get_user_pages() usage.
mmap_sem prevent fork in critical section. then it don't have cow risk.



> > > Yes, current all gup caller have serious bug. especially direct-io, aio, bio
> > > are broken.



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