[git pull] munmap/truncate race fixes

[Al Viro]

	Fixes for racy use of unmap_vmas() on truncate-related codepaths.
Please, pull from
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git vm

Shortlog:
Al Viro (6):
      VM: unmap_page_range() can return void
      VM: can't go through the inner loop in unmap_vmas() more than once...
      VM: make zap_page_range() return void
      VM: don't bother with feeding upper limit to tlb_finish_mmu() in exit_mmap()
      VM: make unmap_vmas() return void
      VM: make zap_page_range() callers that act on a single VMA use separate helper

Diffstat:
 include/linux/mm.h |    4 +-
 mm/memory.c        |  133 +++++++++++++++++++++++++++++++---------------------
 mm/mmap.c          |    5 +-
 3 files changed, 84 insertions(+), 58 deletions(-)
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