Hi Linus, Please pull the latest RCU git tree from: https://github.com/urezki/linux.git tags/rcu.next.v6.10 # HEAD: 64619b283bb35b12a96129e82b40304f7e5551b7: Merge branches 'fixes.2024.04.15a', 'misc.2024.04.12a', 'rcu-sync-normal-improve.2024.04.15a', 'rcu-tasks.2024.04.15a' and 'rcutorture.2024.04.15a' into rcu-merge.2024.04.15a fixes.2024.04.15a: RCU fixes misc.2024.04.12a: Miscellaneous fixes rcu-sync-normal-improve.2024.04.15a: Improving synchronize_rcu() call rcu-tasks.2024.04.15a: Tasks RCU updates rcutorture.2024.04.15a: Torture-test updates One merge conflicts was detected by linux-next: * https://lore.kernel.org/linux-kernel/20240424134551.44531979@xxxxxxxxxxxxxxxx/ The conflict resolution from linux-next look good to me, plus I make my own resolutions at branch merge/rcu.2024.04.30a for your reference. ---------------------------------------------------------------- RCU pull request for v6.10 This pull request contains the following branches: fixes.2024.04.15a: Fix a lockdep complain for lazy-preemptible kernel, remove redundant BH disable for TINY_RCU, remove redundant READ_ONCE() in tree.c, fix false positives KCSAN splat and fix buffer overflow in the print_cpu_stall_info(). misc.2024.04.12a: Misc updates related to bpf, tracing and update the MAINTAINERS file. rcu-sync-normal-improve.2024.04.15a: An improvement of a normal synchronize_rcu() call in terms of latency. It maintains a separate track for sync. users only. This approach bypasses per-cpu nocb-lists thus sync-users do not depend on nocb-list length and how fast regular callbacks are processed. This is controlled by a default-off runtime option. See /sys/module/rcutree/parameters/rcu_normal_wake_from_gp parameter. rcu-tasks.2024.04.15a: RCU tasks, switch tasks RCU grace periods to sleep at TASK_IDLE priority, fix some comments, add some diagnostic warning to the exit_tasks_rcu_start() and fix a buffer overflow in the show_rcu_tasks_trace_gp_kthread(). rcutorture.2024.04.15a: Functionality improvement for better usability and information of the tests, bug fixes, code cleanup and documention update. ---------------------------------------------------------------- Johannes Berg (1): rcu: Mollify sparse with RCU guard Neeraj Upadhyay (1): MAINTAINERS: Update Neeraj's email address Nikita Kiryushin (2): rcu-tasks: Fix show_rcu_tasks_trace_gp_kthread buffer overflow rcu: Fix buffer overflow in print_cpu_stall_info() Paul E. McKenney (29): scftorture: Increase memory provided to guest OS rcutorture: Disable tracing to permit Tasks Rude RCU testing rcu: Add lockdep checks and kernel-doc header to rcu_softirq_qs() rcutorture: Enable RCU priority boosting for TREE09 rcutorture: Dump # online CPUs on insufficient cb-flood laundering rcutorture: Dump GP kthread state on insufficient cb-flood laundering rcutorture: ASSERT_EXCLUSIVE_WRITER() for ->rtort_pipe_count updates rcu-tasks: Make Tasks RCU wait idly for grace-period delays bpf: Select new NEED_TASKS_RCU Kconfig option arch: Select new NEED_TASKS_RCU Kconfig option tracing: Select new NEED_TASKS_RCU Kconfig option bpf: Choose RCU Tasks based on TASKS_RCU rather than PREEMPTION ftrace: Choose RCU Tasks based on TASKS_RCU rather than PREEMPTION rcu: Make TINY_RCU depend on !PREEMPT_RCU rather than !PREEMPTION srcu: Make Tiny SRCU explicitly disable preemption rcu: Create NEED_TASKS_RCU to factor out enablement logic rcu: Remove redundant BH disabling in TINY_RCU rcu: Make Tiny RCU explicitly disable preemption rcu: Remove redundant READ_ONCE() of rcu_state.gp_flags in tree.c rcu: Bring diagnostic read of rcu_state.gp_flags into alignment rcu: Mark writes to rcu_sync ->gp_count field rcu: Mark loads from rcu_state.n_online_cpus rcu: Make hotplug operations track GP state, not flags rcu: Inform KCSAN of one-byte cmpxchg() in rcu_trc_cmpxchg_need_qs() rcu: Remove redundant CONFIG_PROVE_RCU #if condition rcu-tasks: Replace exit_tasks_rcu_start() initialization with WARN_ON_ONCE() rcutorture: Remove extraneous rcu_torture_pipe_update_one() READ_ONCE() rcutorture: Fix rcu_torture_one_read() pipe_count overflow comment torture: Scale --do-kvfree test time Uladzislau Rezki (Sony) (6): rcu: Add data structures for synchronize_rcu() rcu: Update lockdep while in RCU read-side critical section rcu: Reduce synchronize_rcu() latency rcu: Add a trace event for synchronize_rcu_normal() rcu: Support direct wake-up of synchronize_rcu() users rcu: Allocate WQ with WQ_MEM_RECLAIM bit set Zenghui Yu (1): doc: Remove references to arrayRCU.rst Zqiang (7): rcu-tasks: Fix the comments for tasks_rcu_exit_srcu_stall_timer rcutorture: Use the gp_kthread_dbg operation specified by cur_ops rcutorture: Make rcutorture support print rcu-tasks gp state rcutorture: Removing redundant function pointer initialization rcutorture: Make stall-tasks directly exit when rcutorture tests end rcutorture: Fix invalid context warning when enable srcu barrier testing rcutorture: Use rcu_gp_slow_register/unregister() only for rcutype test linke li (1): rcutorture: Re-use value stored to ->rtort_pipe_count instead of re-reading .mailmap | 3 - Documentation/RCU/whatisRCU.rst | 6 +- Documentation/admin-guide/kernel-parameters.txt | 14 ++++ MAINTAINERS | 2 arch/Kconfig | 4 - include/linux/rcupdate.h | 2 include/linux/rcupdate_wait.h | 18 +++--- include/linux/srcutiny.h | 2 include/trace/events/rcu.h | 27 +++++++++ kernel/bpf/Kconfig | 2 kernel/bpf/trampoline.c | 2 kernel/rcu/Kconfig | 2 kernel/rcu/rcu.h | 20 +++--- kernel/rcu/rcutorture.c | 4 - kernel/rcu/srcutiny.c | 31 ++++++++-- kernel/rcu/srcutree.c | 5 - kernel/rcu/sync.c | 8 ++ kernel/rcu/tasks.h | 6 +- kernel/rcu/tiny.c | 2 kernel/rcu/tree.c | 28 +++++++++ kernel/rcu/tree.h | 14 ++++ kernel/rcu/tree_exp.h | 2 kernel/rcu/tree_plugin.h | 4 - kernel/rcu/tree_stall.h | 2 kernel/rcu/update.c | 4 - kernel/trace/Kconfig | 4 - kernel/trace/ftrace.c | 3 - tools/testing/selftests/rcutorture/bin/torture.sh | 2 tools/testing/selftests/rcutorture/configs/rcu/TREE09 | 5 + include/linux/rcupdate.h | 20 +++++- kernel/rcu/Kconfig | 6 +- kernel/rcu/rcutorture.c | 81 +++++++++++++++------------ kernel/rcu/tasks.h | 38 +++++++++++- kernel/rcu/tiny.c | 2 kernel/rcu/tree.c | 408 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++---------- kernel/rcu/tree.h | 10 ++- kernel/rcu/tree_stall.h | 9 ++- tools/testing/selftests/rcutorture/bin/torture.sh | 4 - 38 files changed, 666 insertions(+), 140 deletions(-)
