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Andrea Arcangeli 09fa5296a4 userfaultfd: non-cooperative: wake userfaults after UFFDIO_UNREGISTER 
Userfaults may still happen after the userfaultfd monitor thread
received a UFFD_EVENT_MADVDONTNEED until UFFDIO_UNREGISTER is run.

Wake any pending userfault within UFFDIO_UNREGISTER protected by the
mmap_sem for writing, so they will not be reported to userland leading
to UFFDIO_COPY returning -EINVAL (as the range was already unregistered)
and they will not hang permanently either.

Link: http://lkml.kernel.org/r/20161216144821.5183-16-aarcange@redhat.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>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-02-22 16:41:28 -08:00
arch parisc: use generic current.h 2017-02-22 16:41:27 -08:00
block block: use for_each_thread() in sys_ioprio_set()/sys_ioprio_get() 2017-02-22 16:41:27 -08:00
certs
crypto
Documentation slub: make sysfs directories for memcg sub-caches optional 2017-02-22 16:41:27 -08:00
drivers mm, dax: change pmd_fault() to take only vmf parameter 2017-02-22 16:41:26 -08:00
firmware
fs userfaultfd: non-cooperative: wake userfaults after UFFDIO_UNREGISTER 2017-02-22 16:41:28 -08:00
include userfaultfd: non-cooperative: add madvise() event for MADV_DONTNEED request 2017-02-22 16:41:28 -08:00
init slub: make sysfs directories for memcg sub-caches optional 2017-02-22 16:41:27 -08:00
ipc
kernel userfaultfd: non-cooperative: Add fork() event 2017-02-22 16:41:28 -08:00
lib dma-debug: add comment for failed to check map error 2017-02-22 16:41:26 -08:00
mm userfaultfd: non-cooperative: avoid MADV_DONTNEED race condition 2017-02-22 16:41:28 -08:00
net
samples
scripts scripts/tags.sh: include arch/Kconfig* for tags generation 2017-02-22 16:41:26 -08:00
security
sound
tools tools/vm: add missing Makefile rules 2017-02-22 16:41:26 -08:00
usr
virt
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS dax: update MAINTAINERS entries for FS DAX 2017-02-22 16:41:26 -08:00
Makefile
README

README 

Linux kernel
============

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.