c/r updates

[Oren Laadan <orenl-eQaUEPhvms7ENvBUuze7eA@public.gmane.org>]

Hi,

The current development kernel git:
  git://git.ncl.cs.columbia.edu/pub/git/linux-cr    [ckpt-v15-dev]

The current development user tools git:
  git://git.ncl.cs.columbia.edu/pub/git/user-cr     [ckpt-v15-dev]

(branch naming will remain consistent from now ...)

Dave: I pushed a series of patches/fixes to current c/r tree, some of
which are are relevant to the patch series you're preparing.

Nathan: patches "tee...", "splice..." and "c/r: redo..." change the
way pipes are saved/restored, and avoids the lockdep issue.

Patches:
 c/r: fix ckpt_obj_fetch return values (v3)
 c/r: redo {checkpoint,restore}_pipe() using splice and tee
 splice: added support for pipe-to-pipe splice()
 tee: don't return 0 when another task drains/fills a pipe
 c/r: fix incorrect 'cond ? : xxx' statemnt
 c/r: set expire value to zero for restart block that expired
 c/r: x86 checkpoint support does not depend on CONFIG_COMPAT_VDSO
 c/r: s390: remove unused variable ret
 c/r: s390: fix unterminated ifdef
 c/r: test for ops->restore method in do_restore_file()
 c/r: grab missing reference to a (pipe) file if not first encounter
 Separate restore of task nxproxy (first) and memory (second)
 Fix leak of objects restored in restore_obj()
 c/r: fix users count of files that are pointed to by mm->exe_file
 c/r: fix incorrect variable type in call to strict_strtoul()

Oren.