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Date:	Mon, 16 May 2016 17:25:22 +0200
From:	Oleg Nesterov <>
To:	Andrew Morton <>,
	Andrea Arcangeli <>
Cc:	Linus Torvalds <>,,
Subject: [PATCH 0/1] userfaultfd: don't pin the user memory in


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,

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


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