linux-kernel - [PATCH 0/1] userfaultfd: don't pin the user memory in userfaultfd_file

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Date:	Mon, 16 May 2016 17:25:22 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: [PATCH 0/1] userfaultfd: don't pin the user memory in
 userfaultfd_file_create()

Hello,

Sorry for delay. So this is the same patch, just I added the helpers for get/put
mm->mm_users. I won't mind to change userfaultfd_get_mm() to return mm_struct-or-
NULL, or perhaps instead we should simply add the trivial helper which does
atomic_inc_not_zero(mm->mm_users) into sched.h, it can have more callers (fs/proc,
uprobes).

Testing. I have found selftests/vm/userfaultfd.c and it seems to work.

Oleg.