The following short patch series completes the support for allowing clients to
sleep in mmu notifiers (specifically in invalidate_page and
invalidate_range_start/end), adding on the work done by Andrea Arcangeli and
Sagi Grimberg in http://marc.info/?l=linux-mm&m=133113297028676&w=3

This patchset is a preliminary step towards on-demand paging design to be
added to the Infiniband stack. Our goal is to avoid pinning pages in
memory regions registered for IB communication, so we need to get
notifications for invalidations on such memory regions, and stop the hardware
from continuing its access to the invalidated pages. The hardware operation
that flushes the page tables can block, so we need to sleep until the hardware
is guaranteed not to access these pages anymore.

The first patch moves the mentioned notifier functions out of the PTL, and the
second patch changes the change_pte notification to stop calling
invalidate_page as a default.

Regards,
Haggai Eran

Changes from V0:
- Fixed a bug in patch 1 that prevented compilation without MMU notifiers.
- Dropped the patches 2 and 3 that were moving tlb_gather_mmu calls.
- Added a patch to handle invalidate_page being called from change_pte.

Haggai Eran (1):
  mm: Wrap calls to set_pte_at_notify with invalidate_range_start and
    invalidate_range_end

Sagi Grimberg (1):
  mm: Move all mmu notifier invocations to be done outside the PT lock

 include/linux/mmu_notifier.h | 47 --------------------------------------------
 kernel/events/uprobes.c      |  2 ++
 mm/filemap_xip.c             |  4 +++-
 mm/huge_memory.c             | 32 ++++++++++++++++++++++++------
 mm/hugetlb.c                 | 15 ++++++++------
 mm/ksm.c                     | 13 ++++++++++--
 mm/memory.c                  |  9 ++++++++-
 mm/mmu_notifier.c            |  6 ------
 mm/rmap.c                    | 27 ++++++++++++++++++-------
 9 files changed, 79 insertions(+), 76 deletions(-)

-- 
1.7.11.2

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