* Paul E. McKenney <[email protected]> wrote:
> Hello, Ingo, > > This pull request contains the following changes: > > 1. RCU flavor consolidation cleanups and optmizations. > > http://lkml.kernel.org/r/[email protected] > > 2. Documentation updates. > > http://lkml.kernel.org/r/[email protected] > > 3. Miscellaneous fixes. > > http://lkml.kernel.org/r/[email protected] > > 4. SRCU updates. > > http://lkml.kernel.org/r/[email protected] > > 5. RCU-sync flavor consolidation. > > http://lkml.kernel.org/r/[email protected] > > 6. Torture-test updates. > > http://lkml.kernel.org/r/[email protected] > > 7. Linux-kernel memory-consistency-model updates, most notably > the addition of plain C-language accesses. > > http://lkml.kernel.org/r/[email protected] > > http://lkml.kernel.org/r/[email protected] > > http://lkml.kernel.org/r/[email protected] > > http://lkml.kernel.org/r/[email protected] > > These last three were relatively late additions responding to > LKML feedback. However, the resulting memory model passes its > rather large library of tests, and these changes are furthermore > required to correctly model some tricky situations involving > use of RCU without rcu_assign_pointer() and rcu_dereference(). > These tricky sequences are not theoretical in nature, but rather > from fixes identified by Herbert Xu. It therefore seems best > to get these upstream sooner rather than later. > > All of these changes have been subjected to 0day Test Robot and -next > testing, and are available in the Git repository at: > > git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git > for-mingo > > for you to fetch changes up to b989ff070574ad8b8621d866de0a8e9a65d42c80: > > Merge LKMM and RCU commits (2019-06-24 09:12:39 -0700) > > These changes do increase the size of the kernel by about 300 lines. > About 150 of this was due largely to improvements in rcutorture's > forward-progress testing. Not quite another 100 of this was due to > allowing Tree SRCU to be used from modules without needing to adjust the > size of the reserved region. Not quite an additional 100 of this was for > cleanups after the RCU flavor consolidation effort, including accidentally > fixing a self-deadlock encountered by Sebastian Siewior when booting > with the threadirqs kernel parameter. Finally, yet another not quite > 100 of this was for adding LKMM's support for plain C-language accesses. > This totals to more than 300 because other changes removed code. > > ---------------------------------------------------------------- > Alan Stern (7): > tools/memory-model: Prepare for data-race detection > tools/memory-model: Add definitions of plain and marked accesses > tools/memory-model: Add data-race detection > Documentation: atomic_t.txt: Explain ordering provided by > smp_mb__{before,after}_atomic() > tools/memory-model: Expand definition of barrier > tools/memory-model: Change definition of rcu-fence > tools/memory-model: Improve data-race detection > > Andrea Parri (3): > rcu: Don't return a value from rcu_assign_pointer() > tools/memory-model: Fix comment in MP+poonceonces.litmus > tools/memory-model: Do not use "herd" to refer to "herd7" > > Jiang Biao (2): > rcu: Remove unused rdp local from synchronize_rcu_expedited() > rcu: Make __call_srcu static > > Joel Fernandes (Google) (7): > lockdep: Add assertion to check if in an interrupt > rcu: Add checks for dynticks counters in rcu_is_cpu_rrupt_from_idle() > doc/rcuref: Document real world examples in kernel > srcu: Remove unused vmlinux srcu linker entries > module: Make srcu_struct ptr array as read-only > rcutorture: Select from only online CPUs > rcutorture: Add cpu0 to the set of CPUs to add jitter > > Neeraj Upadhyay (2): > rcu: Dump specified number of blocked tasks > rcu: Correctly unlock root node in rcu_check_gp_start_stall() > > Oleg Nesterov (4): > rcu/sync: Kill rcu_sync_type/gp_type > uprobes: Use DEFINE_STATIC_PERCPU_RWSEM() to initialize dup_mmap_sem > locking/percpu-rwsem: Add DEFINE_PERCPU_RWSEM(), use it to initialize > cgroup_threadgroup_rwsem > rcu/sync: Simplify the state machine > > Paul E. McKenney (34): > rcu: Check for wakeup-safe conditions in rcu_read_unlock_special() > rcu: Only do rcu_read_unlock_special() wakeups if expedited > rcu: Allow rcu_read_unlock_special() to raise_softirq() if in_irq() > rcu: Use irq_work to get scheduler's attention in clean context > rcu: Inline invoke_rcu_callbacks() into its sole remaining caller > rcu: Avoid self-IPI in sync_rcu_exp_select_node_cpus() > rcu: Avoid self-IPI in sync_sched_exp_online_cleanup() > rcu: Rename rcu_data's ->deferred_qs to ->exp_deferred_qs > rcu: Make kfree_rcu() ignore NULL pointers > rcu: Set a maximum limit for back-to-back callback invocation > doc: Remove ".vnet" from paulmck email addresses > srcu: Allocate per-CPU data for DEFINE_SRCU() in modules > rcutorture: Add cond_resched() to forward-progress free-up loop > rcutorture: Fix stutter_wait() return value and freelist checks > torture: Allow inter-stutter interval to be specified > torture: Make kvm-find-errors.sh and kvm-recheck.sh provide exit status > rcutorture: Provide rudimentary Makefile > rcutorture: Exempt tasks RCU from timely draining of grace periods > rcutorture: Exempt TREE01 from forward-progress testing > rcutorture: Give the scheduler a chance on PREEMPT && NO_HZ_FULL kernels > rcutorture: Halt forward-progress checks at end of run > rcutorture: Add trivial RCU implementation > torture: Capture qemu output > torture: Add function graph-tracing cheat sheet > torture: Run kernel build in source directory > torture: Make --cpus override idleness calculations > torture: Add --trust-make to suppress "make clean" > rcutorture: Dump trace buffer for callback pipe drain failures > torture: Suppress propagating trace_printk() warning > rcutorture: Upper case solves the case of the vanishing NULL pointer > rcu: Upgrade sync_exp_work_done() to smp_mb() > rcu: Fix irritating whitespace error in rcu_assign_pointer() > Merge branches 'consolidate.2019.05.28a', 'doc.2019.05.28a', > 'fixes.2019.06.13a', 'srcu.2019.05.28a', 'sync.2019.05.28a' and > 'torture.2019.05.28a' into HEAD > Merge LKMM and RCU commits > > Sebastian Andrzej Siewior (2): > rcu: Enable elimination of Tree-RCU softirq processing > rcutorture: Tweak kvm options > > Waiman Long (1): > rcu: Force inlining of rcu_read_lock() > > Zhenzhong Duan (1): > doc: Fixup definition of rcupdate.rcu_task_stall_timeout > > Documentation/RCU/rcuref.txt | 21 +- > Documentation/RCU/stallwarn.txt | 2 +- > Documentation/RCU/whatisRCU.txt | 8 +- > Documentation/admin-guide/kernel-parameters.txt | 6 + > Documentation/atomic_t.txt | 17 +- > Documentation/core-api/circular-buffers.rst | 2 +- > Documentation/memory-barriers.txt | 2 +- > .../translations/ko_KR/memory-barriers.txt | 2 +- > include/linux/lockdep.h | 7 + > include/linux/module.h | 5 + > include/linux/percpu-rwsem.h | 10 +- > include/linux/rcu_sync.h | 40 ++-- > include/linux/rcupdate.h | 21 +- > include/linux/sched.h | 2 +- > include/linux/srcutree.h | 14 +- > include/linux/torture.h | 2 +- > kernel/cgroup/cgroup.c | 3 +- > kernel/events/uprobes.c | 4 +- > kernel/locking/locktorture.c | 2 +- > kernel/locking/percpu-rwsem.c | 2 +- > kernel/module.c | 5 + > kernel/rcu/rcu.h | 5 + > kernel/rcu/rcutorture.c | 96 +++++++-- > kernel/rcu/srcutree.c | 69 ++++++- > kernel/rcu/sync.c | 214 > ++++++++++----------- > kernel/rcu/tree.c | 164 +++++++++++++--- > kernel/rcu/tree.h | 6 +- > kernel/rcu/tree_exp.h | 53 +++-- > kernel/rcu/tree_plugin.h | 195 ++++++------------- > kernel/rcu/tree_stall.h | 4 +- > kernel/rcu/update.c | 13 ++ > kernel/torture.c | 23 ++- > tools/include/linux/rcu.h | 4 +- > tools/memory-model/linux-kernel.bell | 6 + > tools/memory-model/linux-kernel.cat | 102 +++++++--- > tools/memory-model/linux-kernel.def | 1 + > .../litmus-tests/MP+poonceonces.litmus | 2 +- > tools/memory-model/litmus-tests/README | 2 +- > tools/memory-model/lock.cat | 2 +- > tools/memory-model/scripts/README | 4 +- > tools/memory-model/scripts/checkalllitmus.sh | 2 +- > tools/memory-model/scripts/checklitmus.sh | 2 +- > tools/memory-model/scripts/parseargs.sh | 2 +- > tools/memory-model/scripts/runlitmushist.sh | 2 +- > tools/testing/radix-tree/linux/rcupdate.h | 2 +- > tools/testing/selftests/rcutorture/Makefile | 3 + > .../testing/selftests/rcutorture/bin/configinit.sh | 39 ++-- > tools/testing/selftests/rcutorture/bin/cpus2use.sh | 5 + > .../testing/selftests/rcutorture/bin/functions.sh | 13 +- > tools/testing/selftests/rcutorture/bin/jitter.sh | 13 +- > .../testing/selftests/rcutorture/bin/kvm-build.sh | 9 +- > .../selftests/rcutorture/bin/kvm-find-errors.sh | 3 + > .../selftests/rcutorture/bin/kvm-recheck.sh | 13 +- > .../selftests/rcutorture/bin/kvm-test-1-run.sh | 23 +-- > tools/testing/selftests/rcutorture/bin/kvm.sh | 14 +- > .../selftests/rcutorture/bin/parse-build.sh | 2 +- > .../selftests/rcutorture/bin/parse-console.sh | 1 + > .../selftests/rcutorture/configs/rcu/CFcommon | 3 + > .../selftests/rcutorture/configs/rcu/TREE01.boot | 1 + > .../selftests/rcutorture/configs/rcu/TRIVIAL | 14 ++ > .../selftests/rcutorture/configs/rcu/TRIVIAL.boot | 3 + > 61 files changed, 845 insertions(+), 466 deletions(-) > create mode 100644 tools/testing/selftests/rcutorture/Makefile > create mode 100644 tools/testing/selftests/rcutorture/configs/rcu/TRIVIAL > create mode 100644 > tools/testing/selftests/rcutorture/configs/rcu/TRIVIAL.boot Pulled, thanks a lot Paul! Ingo
