[GIT PULL] scheduler fixes

[Ingo Molnar]

Linus,

Please pull the latest sched-urgent-for-linus git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched-urgent-for-linus

   # HEAD: 4892f51ad54ddff2883a60b6ad4323c1f632a9d6 sched/fair: Avoid redundant EAS calculation

The changes are:

 - Apply a number of membarrier related fixes and cleanups, which fixes a 
   use-after-free race in the membarrier code.

 - Introduce proper RCU protection for tasks on the runqueue - to get rid 
   of the subtle task_rcu_dereference() interface that was easy to get 
   wrong.

 - Misc fixes, but also an EAS speedup.

 Thanks,

	Ingo

------------------>
Eric W. Biederman (4):
      tasks: Add a count of task RCU users
      tasks, sched/core: Ensure tasks are available for a grace period after leaving the runqueue
      tasks, sched/core: With a grace period after finish_task_switch(), remove unnecessary code
      tasks, sched/core: RCUify the assignment of rq->curr

KeMeng Shi (1):
      sched/core: Fix migration to invalid CPU in __set_cpus_allowed_ptr()

Mathieu Desnoyers (7):
      sched/membarrier: Fix private expedited registration check
      sched/membarrier: Remove redundant check
      sched/membarrier: Call sync_core only before usermode for same mm
      sched/membarrier: Fix p->mm->membarrier_state racy load
      selftests, sched/membarrier: Add multi-threaded test
      sched/membarrier: Skip IPIs when mm->mm_users == 1
      sched/membarrier: Return -ENOMEM to userspace on memory allocation failure

Qian Cai (3):
      sched/fair: Remove unused cfs_rq_clock_task() function
      sched/core: Convert vcpu_is_preempted() from macro to an inline function
      sched/fair: Fix -Wunused-but-set-variable warnings

Quentin Perret (1):
      sched/fair: Avoid redundant EAS calculation

Valentin Schneider (2):
      sched/core: Fix preempt_schedule() interrupt return comment
      sched/core: Remove double update_max_interval() call on CPU startup


 fs/exec.c                                          |   2 +-
 include/linux/mm_types.h                           |  14 +-
 include/linux/rcuwait.h                            |  20 +-
 include/linux/sched.h                              |  10 +-
 include/linux/sched/mm.h                           |  10 +-
 include/linux/sched/task.h                         |   2 +-
 kernel/exit.c                                      |  74 +------
 kernel/fork.c                                      |   8 +-
 kernel/sched/core.c                                |  28 +--
 kernel/sched/fair.c                                |  39 +---
 kernel/sched/membarrier.c                          | 239 +++++++++++++--------
 kernel/sched/sched.h                               |  34 +++
 tools/testing/selftests/membarrier/.gitignore      |   3 +-
 tools/testing/selftests/membarrier/Makefile        |   5 +-
 .../{membarrier_test.c => membarrier_test_impl.h}  |  40 ++--
 .../membarrier/membarrier_test_multi_thread.c      |  73 +++++++
 .../membarrier/membarrier_test_single_thread.c     |  24 +++
 17 files changed, 375 insertions(+), 250 deletions(-)
 rename tools/testing/selftests/membarrier/{membarrier_test.c => membarrier_test_impl.h} (95%)
 create mode 100644 tools/testing/selftests/membarrier/membarrier_test_multi_thread.c
 create mode 100644 tools/testing/selftests/membarrier/membarrier_test_single_thread.c