[RFP 0/3] Make mmu_notifier_invalidate_range_start able to sleep.

[Robin Holt <holt@sgi.com>]

This proposed set of patches is three parts.  The first changes
mmu_notifiers over to using srcu instead of rcu, the second move the
tlb_gather_mmu after the mmu_notifier_invalidate_range_start, and the
last allows the truncate call to zap_page_range work in an atomic context.

The atomic context is accomplished by unlocking the i_mmap_lock and then
making a second call into mmu_notifier_invalidate_range_start().

Signed-off-by: Robin Holt <holt@sgi.com>
Cc: Jack Steiner <steiner@sgi.com>
To: Andrea Arcangeli <aarcange@redhat.com>
Cc: linux-mm@kvack.org

---

 include/linux/mm.h           |    2 -
 include/linux/mmu_notifier.h |   20 +++++++-----
 include/linux/srcu.h         |    2 +
 mm/fremap.c                  |    2 -
 mm/hugetlb.c                 |    2 -
 mm/memory.c                  |   36 ++++++++++++++++------
 mm/mmap.c                    |    6 +--
 mm/mmu_notifier.c            |   69 ++++++++++++++++++++++++++-----------------
 mm/mprotect.c                |    2 -
 mm/mremap.c                  |    2 -
 10 files changed, 90 insertions(+), 53 deletions(-)

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