linux-kernel - Question about PRIVATE

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Message-ID: <28c262360903261912n4ce235c6wf2f75b2be7faf0f4@mail.gmail.com>
Date:	Fri, 27 Mar 2009 11:12:21 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>,
	Eric Dumazet <dada1@...mosbay.com>
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: Question about PRIVATE_FUTEX

Hi, Peter and Eric.

I am not expert about futex.
I am sorry if this is dumb question.

If we use private futex, get_futex_key don't call get_user_pages_fast
which pins page at page table.
Then, get_futex_value_locked calls __cpy_from_user_inatomic with
pagefault_disable.

Who make sure the user page is mapped at app's page table ?

-- 
Kinds regards,
Minchan Kim
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