[git pull] signal.git pile 2 (of 3, probably)

[Al Viro]

That one is just task_work_add() series + remaining prereqs for it.
There probably will be another pull request from that tree this
cycle - at least for helpers, to get them out of the way for per-arch
fixes remaining in the tree.  Please, pull from
git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal for-linus

Shortlog:
Al Viro (4):
      TIF_NOTIFY_RESUME is defined on all targets now
      move key_repace_session_keyring() into tracehook_notify_resume()
      parisc: need to check NOTIFY_RESUME when exiting from syscall
      avr32: missed _TIF_NOTIFY_RESUME on one of do_notify_resume callers

Oleg Nesterov (5):
      task_work_add: generic process-context callbacks
      genirq: reimplement exit_irq_thread() hook via task_work_add()
      keys: change keyctl_session_to_parent() to use task_work_add()
      keys: kill the dummy key_replace_session_keyring()
      keys: kill task_struct->replacement_session_keyring

Diffstat:
 arch/alpha/kernel/signal.c       |    2 -
 arch/arm/kernel/signal.c         |    2 -
 arch/avr32/kernel/entry-avr32b.S |    2 +-
 arch/avr32/kernel/signal.c       |    2 -
 arch/blackfin/kernel/signal.c    |    2 -
 arch/c6x/kernel/signal.c         |    2 -
 arch/cris/kernel/ptrace.c        |    2 -
 arch/frv/kernel/signal.c         |    2 -
 arch/h8300/kernel/signal.c       |    2 -
 arch/hexagon/kernel/signal.c     |    2 -
 arch/ia64/kernel/process.c       |    2 -
 arch/m32r/kernel/signal.c        |    2 -
 arch/m68k/kernel/signal.c        |    5 +--
 arch/microblaze/kernel/signal.c  |    5 +--
 arch/mips/kernel/signal.c        |    2 -
 arch/mn10300/kernel/signal.c     |    2 -
 arch/openrisc/kernel/signal.c    |    2 -
 arch/parisc/kernel/entry.S       |    2 +-
 arch/parisc/kernel/signal.c      |    2 -
 arch/powerpc/kernel/signal.c     |    2 -
 arch/s390/kernel/signal.c        |    2 -
 arch/score/kernel/signal.c       |    2 -
 arch/sh/kernel/signal_32.c       |    2 -
 arch/sh/kernel/signal_64.c       |    2 -
 arch/sparc/kernel/signal_32.c    |    2 -
 arch/sparc/kernel/signal_64.c    |    2 -
 arch/tile/kernel/process.c       |    2 -
 arch/um/kernel/process.c         |    5 +--
 arch/unicore32/kernel/signal.c   |    2 -
 arch/x86/kernel/signal.c         |    2 -
 arch/xtensa/kernel/signal.c      |    5 +--
 include/linux/interrupt.h        |    4 --
 include/linux/key.h              |    4 --
 include/linux/sched.h            |   14 ++-----
 include/linux/task_work.h        |   33 +++++++++++++++
 include/linux/tracehook.h        |   13 +++++-
 kernel/Makefile                  |    2 +-
 kernel/cred.c                    |    9 ----
 kernel/exit.c                    |    5 +-
 kernel/fork.c                    |    1 +
 kernel/irq/manage.c              |   68 +++++++++++++++----------------
 kernel/task_work.c               |   84 ++++++++++++++++++++++++++++++++++++++
 security/keys/internal.h         |    2 +
 security/keys/keyctl.c           |   73 ++++++++++++++++-----------------
 security/keys/process_keys.c     |   20 +++------
 45 files changed, 220 insertions(+), 186 deletions(-)
 create mode 100644 include/linux/task_work.h
 create mode 100644 kernel/task_work.c
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