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Subject[GIT PULL] RCU changes for v5.10
Linus,

Please pull the latest core/rcu git tree from:

git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git core-rcu-2020-10-12

# HEAD: c6de896fa0a4546c799c86513d99bd011b4a6177 Merge branch 'rcu/fix-rt' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu

RCU changes for v5.10:

- Debugging for smp_call_function()
- RT raw/non-raw lock ordering fixes
- Strict grace periods for KASAN
- New smp_call_function() torture test
- Torture-test updates
- Documentation updates
- Miscellaneous fixes

Thanks,

Ingo

------------------>
Alexander A. Klimov (1):
rcutorture: Replace HTTP links with HTTPS ones

Colin Ian King (1):
refperf: Avoid null pointer dereference when buf fails to allocate

Joel Fernandes (Google) (6):
rcu/trace: Print negative GP numbers correctly
rcu/trace: Use gp_seq_req in acceleration's rcu_grace_period tracepoint
rcu: Clarify comments about FQS loop reporting quiescent states
rcu: Make FQS more aggressive in complaining about offline CPUs
rcutorture: Output number of elapsed grace periods
rcu/segcblist: Prevent useless GP start if no CBs to accelerate

Madhuparna Bhowmik (2):
rculist: Introduce list/hlist_for_each_entry_srcu() macros
kvm: mmu: page_track: Fix RCU list API usage

Neeraj Upadhyay (2):
rcu/tree: Force quiescent state on callback overload
rcu/tree: Remove CONFIG_PREMPT_RCU check in force_qs_rnp()

Paul E. McKenney (56):
lib: Add backtrace_idle parameter to force backtrace of idle CPUs
rcu: Remove KCSAN stubs
rcu: Remove KCSAN stubs from update.c
srcu: Remove KCSAN stubs
rcu: Initialize at declaration time in rcu_exp_handler()
nocb: Clarify RCU nocb CPU error message
nocb: Remove show_rcu_nocb_state() false positive printout
rcu: Add READ_ONCE() to rcu_do_batch() access to rcu_divisor
rcu: Add READ_ONCE() to rcu_do_batch() access to rcu_resched_ns
rcu: Add READ_ONCE() to rcu_do_batch() access to rcu_kick_kthreads
rcu: Add READ_ONCE() to rcu_do_batch() access to rcu_cpu_stall_ftrace_dump
rcu: Move rcu_cpu_started per-CPU variable to rcu_data
rcu/nocb: Add a warning for non-GP kthread running GP code
rcu: Remove unused __rcu_is_watching() function
scftorture: Add smp_call_function() torture test
torture: Declare parse-console.sh independence from rcutorture
torture: Add scftorture to the rcutorture scripting
scftorture: Implement weighted primitive selection
tick-sched: Clarify "NOHZ: local_softirq_pending" warning
scftorture: Summarize per-thread statistics
scftorture: Add smp_call_function_single() memory-ordering checks
scftorture: Add smp_call_function_many() memory-ordering checks
scftorture: Add smp_call_function() memory-ordering checks
scftorture: Consolidate scftorture_invoke_one() check and kfree()
scftorture: Consolidate scftorture_invoke_one() scf_check initialization
scftorture: Flag errors in torture-compatible manner
scftorture: Prevent compiler from reducing race probabilities
scftorture: Check unexpected "switch" statement value
scftorture: Block scftorture_invoker() kthreads for offline CPUs
scftorture: Adapt memory-ordering test to UP operation
scftorture: Add cond_resched() to test loop
rcuperf: Change rcuperf to rcuscale
rcu: Add Kconfig option for strict RCU grace periods
rcu: Reduce leaf fanout for strict RCU grace periods
rcu: Restrict default jiffies_till_first_fqs for strict RCU GPs
rcu: Force DEFAULT_RCU_BLIMIT to 1000 for strict RCU GPs
rcu: Always set .need_qs from __rcu_read_lock() for strict GPs
rcu: Do full report for .need_qs for strict GPs
rcu: Attempt QS when CPU discovers GP for strict GPs
rcu: IPI all CPUs at GP start for strict GPs
rcu: IPI all CPUs at GP end for strict GPs
rcu: Provide optional RCU-reader exit delay for strict GPs
rcu: Execute RCU reader shortly after rcu_core for strict GPs
rcu: Report QS for outermost PREEMPT=n rcu_read_unlock() for strict GPs
rcu: Remove unused "cpu" parameter from rcu_report_qs_rdp()
rcutorture: Remove KCSAN stubs
torture: Update initrd documentation
rcutorture: Add CONFIG_PROVE_RCU_LIST to TREE05
torture: Add kvm.sh --help and update help message
rcutorture: Properly set rcu_fwds for OOM handling
rcutorture: Properly synchronize with OOM notifier
rcutorture: Hoist OOM registry up one level
rcutorture: Allow pointer leaks to test diagnostic code
torture: Add gdb support
smp: Add source and destination CPUs to __call_single_data
kernel/smp: Provide CSD lock timeout diagnostics

Paul Gortmaker (1):
torture: document --allcpus argument added to the kvm.sh script

Randy Dunlap (2):
doc: Drop doubled words from RCU Data-Structures.rst
doc: Drop doubled words from RCU requirements documentation

Thomas Gleixner (13):
lib/debug: Remove pointless ARCH_NO_PREEMPT dependencies
preempt: Make preempt count unconditional
preempt: Cleanup PREEMPT_COUNT leftovers
lockdep: Cleanup PREEMPT_COUNT leftovers
mm/pagemap: Cleanup PREEMPT_COUNT leftovers
locking/bitspinlock: Cleanup PREEMPT_COUNT leftovers
uaccess: Cleanup PREEMPT_COUNT leftovers
sched: Cleanup PREEMPT_COUNT leftovers
ARM: Cleanup PREEMPT_COUNT leftovers
xtensa: Cleanup PREEMPT_COUNT leftovers
drm/i915: Cleanup PREEMPT_COUNT leftovers
rcutorture: Cleanup PREEMPT_COUNT leftovers
preempt: Remove PREEMPT_COUNT from Kconfig

Tobias Klauser (2):
docs: Fix typo in synchronize_rcu() function name
rcu: Fix kerneldoc comments in rcupdate.h

Uladzislau Rezki (Sony) (1):
rcu/tree: Allocate a page when caller is preemptible

Wei Yongjun (3):
scftorture: Make symbol 'scf_torture_rand' static
locktorture: Make function torture_percpu_rwsem_init() static
smp: Make symbol 'csd_bug_count' static

Zqiang (1):
rcu: Shrink each possible cpu krcp

kernel test robot (1):
kvfree_rcu(): Fix ifnullfree.cocci warnings


.../RCU/Design/Data-Structures/Data-Structures.rst | 2 +-
.../RCU/Design/Requirements/Requirements.rst | 4 +-
Documentation/RCU/whatisRCU.rst | 2 +-
Documentation/admin-guide/kernel-parameters.txt | 153 +++++-
MAINTAINERS | 3 +-
arch/arm/include/asm/assembler.h | 11 -
arch/arm/kernel/iwmmxt.S | 2 -
arch/arm/mach-ep93xx/crunch-bits.S | 2 -
arch/x86/kvm/mmu/page_track.c | 6 +-
arch/xtensa/kernel/entry.S | 2 +-
drivers/gpu/drm/i915/Kconfig.debug | 1 -
drivers/gpu/drm/i915/i915_utils.h | 3 +-
include/linux/bit_spinlock.h | 4 +-
include/linux/lockdep.h | 6 +-
include/linux/pagemap.h | 4 +-
include/linux/preempt.h | 37 +-
include/linux/rculist.h | 48 ++
include/linux/rcupdate.h | 19 +-
include/linux/rcutiny.h | 1 -
include/linux/rcutree.h | 1 -
include/linux/smp.h | 3 +
include/linux/smp_types.h | 3 +
include/linux/uaccess.h | 6 +-
include/trace/events/rcu.h | 54 +-
kernel/Kconfig.preempt | 4 -
kernel/Makefile | 2 +
kernel/entry/common.c | 2 +-
kernel/locking/locktorture.c | 2 +-
kernel/rcu/Kconfig | 8 +-
kernel/rcu/Kconfig.debug | 17 +-
kernel/rcu/Makefile | 2 +-
kernel/rcu/rcu_segcblist.c | 10 +-
kernel/rcu/{rcuperf.c => rcuscale.c} | 330 ++++++------
kernel/rcu/rcutorture.c | 61 ++-
kernel/rcu/refscale.c | 8 +-
kernel/rcu/srcutree.c | 13 -
kernel/rcu/tree.c | 244 +++++----
kernel/rcu/tree.h | 2 +
kernel/rcu/tree_exp.h | 6 +-
kernel/rcu/tree_plugin.h | 40 +-
kernel/rcu/tree_stall.h | 8 +-
kernel/rcu/update.c | 13 -
kernel/scftorture.c | 575 +++++++++++++++++++++
kernel/sched/core.c | 6 +-
kernel/smp.c | 134 +++++
kernel/time/tick-sched.c | 2 +-
lib/Kconfig.debug | 24 +-
lib/nmi_backtrace.c | 6 +-
...rf-ftrace.sh => kvm-recheck-rcuscale-ftrace.sh} | 6 +-
...-recheck-rcuperf.sh => kvm-recheck-rcuscale.sh} | 14 +-
.../selftests/rcutorture/bin/kvm-recheck-scf.sh | 38 ++
.../selftests/rcutorture/bin/kvm-test-1-run.sh | 33 +-
tools/testing/selftests/rcutorture/bin/kvm.sh | 36 +-
.../selftests/rcutorture/bin/parse-console.sh | 11 +-
.../selftests/rcutorture/configs/rcu/SRCU-t | 1 -
.../selftests/rcutorture/configs/rcu/SRCU-u | 1 -
.../selftests/rcutorture/configs/rcu/TINY01 | 1 -
.../selftests/rcutorture/configs/rcu/TREE05 | 1 +
.../selftests/rcutorture/configs/rcuperf/CFcommon | 2 -
.../configs/{rcuperf => rcuscale}/CFLIST | 0
.../selftests/rcutorture/configs/rcuscale/CFcommon | 2 +
.../rcutorture/configs/{rcuperf => rcuscale}/TINY | 0
.../rcutorture/configs/{rcuperf => rcuscale}/TREE | 0
.../configs/{rcuperf => rcuscale}/TREE54 | 0
.../configs/{rcuperf => rcuscale}/ver_functions.sh | 4 +-
.../selftests/rcutorture/configs/scf/CFLIST | 2 +
.../selftests/rcutorture/configs/scf/CFcommon | 2 +
.../selftests/rcutorture/configs/scf/NOPREEMPT | 9 +
.../rcutorture/configs/scf/NOPREEMPT.boot | 1 +
.../selftests/rcutorture/configs/scf/PREEMPT | 9 +
.../rcutorture/configs/scf/ver_functions.sh | 30 ++
.../testing/selftests/rcutorture/doc/TINY_RCU.txt | 5 +-
.../selftests/rcutorture/doc/TREE_RCU-kconfig.txt | 1 -
tools/testing/selftests/rcutorture/doc/initrd.txt | 36 +-
.../selftests/rcutorture/doc/rcu-test-image.txt | 41 +-
.../rcutorture/formal/srcu-cbmc/src/config.h | 1 -
76 files changed, 1626 insertions(+), 557 deletions(-)
rename kernel/rcu/{rcuperf.c => rcuscale.c} (64%)
create mode 100644 kernel/scftorture.c
rename tools/testing/selftests/rcutorture/bin/{kvm-recheck-rcuperf-ftrace.sh => kvm-recheck-rcuscale-ftrace.sh} (92%)
rename tools/testing/selftests/rcutorture/bin/{kvm-recheck-rcuperf.sh => kvm-recheck-rcuscale.sh} (84%)
create mode 100755 tools/testing/selftests/rcutorture/bin/kvm-recheck-scf.sh
delete mode 100644 tools/testing/selftests/rcutorture/configs/rcuperf/CFcommon
rename tools/testing/selftests/rcutorture/configs/{rcuperf => rcuscale}/CFLIST (100%)
create mode 100644 tools/testing/selftests/rcutorture/configs/rcuscale/CFcommon
rename tools/testing/selftests/rcutorture/configs/{rcuperf => rcuscale}/TINY (100%)
rename tools/testing/selftests/rcutorture/configs/{rcuperf => rcuscale}/TREE (100%)
rename tools/testing/selftests/rcutorture/configs/{rcuperf => rcuscale}/TREE54 (100%)
rename tools/testing/selftests/rcutorture/configs/{rcuperf => rcuscale}/ver_functions.sh (88%)
create mode 100644 tools/testing/selftests/rcutorture/configs/scf/CFLIST
create mode 100644 tools/testing/selftests/rcutorture/configs/scf/CFcommon
create mode 100644 tools/testing/selftests/rcutorture/configs/scf/NOPREEMPT
create mode 100644 tools/testing/selftests/rcutorture/configs/scf/NOPREEMPT.boot
create mode 100644 tools/testing/selftests/rcutorture/configs/scf/PREEMPT
create mode 100644 tools/testing/selftests/rcutorture/configs/scf/ver_functions.sh

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