]> git.baikalelectronics.ru Git - kernel.git/commit
userfaultfd: non-cooperative: add mremap() event
authorPavel Emelyanov <xemul@parallels.com>
Wed, 22 Feb 2017 23:42:34 +0000 (15:42 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 23 Feb 2017 00:41:28 +0000 (16:41 -0800)
commit2aa45a231672888fc874a6cae5de748d11f1c8af
tree0e607734e047d2dc7379b186c5c8c57e9276fd8a
parent4ed12870c125ccf27770c9303675be19e658884c
userfaultfd: non-cooperative: add mremap() event

The event denotes that an area [start:end] moves to different location.
Length change isn't reported as "new" addresses, if they appear on the
uffd reader side they will not contain any data and the latter can just
zeromap them.

Waiting for the event ACK is also done outside of mmap sem, as for fork
event.

Link: http://lkml.kernel.org/r/20161216144821.5183-12-aarcange@redhat.com
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Cc: Hillf Danton <hillf.zj@alibaba-inc.com>
Cc: Michael Rapoport <RAPOPORT@il.ibm.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
fs/userfaultfd.c
include/linux/userfaultfd_k.h
include/uapi/linux/userfaultfd.h
mm/mremap.c