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Date: Mon, 30 Nov 2020 11:39:48 -0800
From: "Paul E. McKenney" <paulmck@...nel.org>
To: mingo@...nel.org
Cc: tglx@...utronix.de, stern@...land.harvard.edu,
anna-maria@...utronix.de, b00073877@....edu, unixbhaskar@...il.com,
foxhlchen@...il.com, frederic@...nel.org, houtao1@...wei.com,
sh_def@....com, kuba@...nel.org, joe@...ches.com,
joel@...lfernandes.org, elver@...gle.com,
mchehab+huawei@...nel.org, neeraju@...eaurora.org,
peterz@...radead.org, sam.hernandez.amador@...il.com,
urezki@...il.com, zhouzhouyi@...il.com, chao@...o.com,
linux-kernel@...r.kernel.org, rcu@...r.kernel.org
Subject: [GIT PULL tip/core/rcu] RCU, LKMM, and KCSAN commits for v5.11
Hello, Ingo!
This pull request contains changes for RCU, KCSAN, and LKMM. You can pull
the group using branch for-mingo. Or, if you prefer, you can pull them
separately, using for-mingo-rcu to pull the RCU changes, for-mingo-kcsan
to pull the KCSAN changes, and for-mingo-lkmm to pull the LKMM changes.
The changes are as follows:
1. RCU updates (for-mingo-rcu):
a. Avoid cpuinfo-induced IPI pileups and idle-CPU IPIs.
b. Documentation updates.
c. Miscellaneous fixes. These include a long-awaited fix
for that bug reported by Sebastian Andrzej Siewior, which
has been since pulled into mainline. (But mentioned
here in case you thought that I had forgotten about it.)
d. Lockdep-RCU updates reducing the need for __maybe_unused.
e. Tasks-RCU updates.
f. Torture-test updates.
2. KCSAN updates (for-mingo-kcsan) for selftests, avoiding setting
watchpoints on NULL pointers, and a fix to watchpoint encoding.
3. LKMM updates (for-mingo-lkmm) for documentation along with some
updates to example-code litmus tests.
All of the commits in this pull request have been subjected to subjected
to the kbuild test robot and -next testing, and are available in the
git repository based on 5.10-rc1 at:
git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git for-mingo
for you to fetch changes up to 50df51d12c3175573de9c94968639bdd625ec549:
Merge branch 'lkmm.2020.11.06a' into HEAD (2020-11-19 19:38:53 -0800)
----------------------------------------------------------------
Alan Stern (1):
tools: memory-model: Document that the LKMM can easily miss control dependencies
Anna-Maria Behnsen (1):
tools/rcutorture: Fix BUG parsing of console.log
Asif Rasheed (1):
list.h: Update comment to explicitly note circular lists
Bhaskar Chowdhury (1):
tools/nolibc: Fix a spelling error in a comment
Fox Chen (1):
docs/memory-barriers.txt: Fix a typo in CPU MEMORY BARRIERS section
Frederic Weisbecker (1):
rcu: Implement rcu_segcblist_is_offloaded() config dependent
Hou Tao (2):
locktorture: Ignore nreaders_stress if no readlock support
locktorture: Invoke percpu_free_rwsem() to do percpu-rwsem cleanup
Hui Su (1):
docs/rcu: Update the call_rcu() API
Jakub Kicinski (7):
sched: Un-hide lockdep_tasklist_lock_is_held() for !LOCKDEP
rcu: Un-hide lockdep maps for !LOCKDEP
net: Un-hide lockdep_sock_is_held() for !LOCKDEP
net: sched: Remove broken definitions and un-hide for !LOCKDEP
srcu: Use a more appropriate lockdep helper
lockdep: Provide dummy forward declaration of *_is_held() helpers
rcu: Prevent RCU_LOCKDEP_WARN() from swallowing the condition
Joe Perches (1):
rcu/tree: Make struct kernel_param_ops definitions const
Joel Fernandes (Google) (3):
docs: Update RCU's hotplug requirements with a bit about design
rcu/tree: Add a warning if CPU being onlined did not report QS already
rcu/tree: nocb: Avoid raising softirq for offloaded ready-to-execute CBs
Marco Elver (3):
kcsan: selftest: Ensure that address is at least PAGE_SIZE
kcsan: Never set up watchpoints on NULL pointers
kcsan: Fix encoding masks and regain address bit
Mauro Carvalho Chehab (1):
docs: RCU: Requirements.rst: Fix a list block
Neeraj Upadhyay (2):
rcu: Fix single-CPU check in rcu_blocking_is_gp()
rcu: Clarify nocb kthreads naming in RCU_NOCB_CPU config
Paul E. McKenney (44):
tools/memory-model: Move Documentation description to Documentation/README
doc: Present the role of READ_ONCE()
rcutorture: Make preemptible TRACE02 enable lockdep
rcu-tasks: Convert rcu_tasks_wait_gp() for-loop to while-loop
rcutorture: Make grace-period kthread report match RCU flavor being tested
refscale: Bounds-check module parameters
torture: Don't kill gdb sessions
x86/cpu: Avoid cpuinfo-induced IPI pileups
x86/cpu: Avoid cpuinfo-induced IPIing of idle CPUs
locktorture: Track time of last ->writeunlock()
torture: Periodically pause in stutter_wait()
torture: Make torture_stutter() use hrtimer
scftorture: Add an alternative IPI vector
rcuscale: Add RCU Tasks Trace
rcuscale: Avoid divide by zero
torture: Exclude "NOHZ tick-stop error" from fatal errors
rcuscale: Prevent hangs for invalid arguments
refscale: Prevent hangs for invalid arguments
rcutorture: Adjust scenarios SRCU-t and SRCU-u to make kconfig happy
locktorture: Prevent hangs for invalid arguments
torture: Prevent jitter processes from delaying failed run
rcutorture: Prevent hangs for invalid arguments
torture: Force weak-hashed pointers on console log
rcutorture: Make stutter_wait() caller restore priority
torture: Accept time units on kvm.sh --duration argument
rcutorture: Small code cleanups
torture: Allow alternative forms of kvm.sh command-line arguments
scftorture: Add full-test stutter capability
rcutorture: Don't do need_resched() testing if ->sync is NULL
torture: Make kvm-check-branches.sh use --allcpus
rcu-tasks: Make the units of ->init_fract be jiffies
tools/memory-model: Document categories of ordering primitives
tools/memory-model: Add a glossary of LKMM terms
tools/memory-model: Add types to litmus tests
tools/memory-model: Use "buf" and "flag" for message-passing tests
tools/memory-model: Label MP tests' producers and consumers
rcu: Don't invoke try_invoke_on_locked_down_task() with irqs disabled
x86/smpboot: Move rcu_cpu_starting() earlier
rcu: Prevent lockdep-RCU splats on lock acquisition/release
rcu: Do not report strict GPs for outgoing CPUs
srcu: Take early exit on memory-allocation failure
Merge branches 'cpuinfo.2020.11.06a', 'doc.2020.11.06a', 'fixes.2020.11.19b', 'lockdep.2020.11.02a', 'tasks.2020.11.06a' and 'torture.2020.11.06a' into HEAD
Merge branch 'kcsan.2020.11.06a' into HEAD
Merge branch 'lkmm.2020.11.06a' into HEAD
Peter Zijlstra (2):
rcu: Allow rcu_irq_enter_check_tick() from NMI
rcu,ftrace: Fix ftrace recursion
Samuel Hernandez (1):
rcutorture/nolibc: Fix a typo in header file
Uladzislau Rezki (Sony) (1):
rcu/tree: Defer kvfree_rcu() allocation to a clean context
Zhouyi Zhou (1):
rcu: Fix a typo in rcu_blocking_is_gp() header comment
chao (1):
rcu: Panic after fixed number of stalls
.../RCU/Design/Requirements/Requirements.rst | 50 +-
Documentation/RCU/checklist.rst | 7 +
Documentation/RCU/rcu_dereference.rst | 6 +
Documentation/RCU/whatisRCU.rst | 3 +-
Documentation/memory-barriers.txt | 2 +-
arch/x86/kernel/cpu/aperfmperf.c | 16 +-
arch/x86/kernel/cpu/mtrr/mtrr.c | 2 -
arch/x86/kernel/smpboot.c | 1 +
include/linux/kernel.h | 1 +
include/linux/list.h | 2 +-
include/linux/lockdep.h | 6 +
include/linux/rcupdate.h | 11 +-
include/linux/rcupdate_trace.h | 4 +-
include/linux/rcutiny.h | 2 +
include/linux/rcutree.h | 1 +
include/linux/sched/task.h | 2 -
include/net/sch_generic.h | 12 -
include/net/sock.h | 2 -
kernel/kcsan/encoding.h | 20 +-
kernel/kcsan/selftest.c | 3 +
kernel/locking/locktorture.c | 36 +-
kernel/rcu/Kconfig | 20 +-
kernel/rcu/rcu.h | 16 +
kernel/rcu/rcu_segcblist.h | 2 +-
kernel/rcu/rcuscale.c | 37 +-
kernel/rcu/rcutorture.c | 52 +-
kernel/rcu/refscale.c | 11 +-
kernel/rcu/srcutree.c | 6 +-
kernel/rcu/tasks.h | 49 +-
kernel/rcu/tree.c | 200 +++++---
kernel/rcu/tree.h | 2 +
kernel/rcu/tree_plugin.h | 2 +-
kernel/rcu/tree_stall.h | 28 +-
kernel/scftorture.c | 49 +-
kernel/sysctl.c | 11 +
kernel/torture.c | 34 +-
tools/include/nolibc/nolibc.h | 4 +-
tools/memory-model/Documentation/README | 76 +++
.../Documentation/control-dependencies.txt | 258 ++++++++++
tools/memory-model/Documentation/glossary.txt | 172 +++++++
tools/memory-model/Documentation/litmus-tests.txt | 17 +
tools/memory-model/Documentation/ordering.txt | 556 +++++++++++++++++++++
tools/memory-model/README | 22 +-
.../litmus-tests/CoRR+poonceonce+Once.litmus | 4 +-
.../litmus-tests/CoRW+poonceonce+Once.litmus | 4 +-
.../litmus-tests/CoWR+poonceonce+Once.litmus | 4 +-
.../litmus-tests/CoWW+poonceonce.litmus | 4 +-
.../IRIW+fencembonceonces+OnceOnce.litmus | 5 +-
.../litmus-tests/IRIW+poonceonces+OnceOnce.litmus | 5 +-
.../ISA2+pooncelock+pooncelock+pombonce.litmus | 7 +-
.../litmus-tests/ISA2+poonceonces.litmus | 6 +-
...cerelease+poacquirerelease+poacquireonce.litmus | 6 +-
.../LB+fencembonceonce+ctrlonceonce.litmus | 5 +-
.../LB+poacquireonce+pooncerelease.litmus | 5 +-
.../litmus-tests/LB+poonceonces.litmus | 5 +-
.../MP+fencewmbonceonce+fencermbonceonce.litmus | 19 +-
.../litmus-tests/MP+onceassign+derefonce.litmus | 15 +-
.../MP+polockmbonce+poacquiresilsil.litmus | 8 +-
.../MP+polockonce+poacquiresilsil.litmus | 8 +-
tools/memory-model/litmus-tests/MP+polocks.litmus | 20 +-
.../litmus-tests/MP+poonceonces.litmus | 19 +-
.../MP+pooncerelease+poacquireonce.litmus | 19 +-
.../memory-model/litmus-tests/MP+porevlocks.litmus | 20 +-
.../litmus-tests/R+fencembonceonces.litmus | 5 +-
.../memory-model/litmus-tests/R+poonceonces.litmus | 5 +-
.../S+fencewmbonceonce+poacquireonce.litmus | 5 +-
.../memory-model/litmus-tests/S+poonceonces.litmus | 5 +-
.../litmus-tests/SB+fencembonceonces.litmus | 5 +-
.../litmus-tests/SB+poonceonces.litmus | 5 +-
.../litmus-tests/SB+rfionceonce-poonceonces.litmus | 5 +-
.../litmus-tests/WRC+poonceonces+Once.litmus | 5 +-
.../WRC+pooncerelease+fencermbonceonce+Once.litmus | 5 +-
.../Z6.0+pooncelock+poonceLock+pombonce.litmus | 7 +-
.../Z6.0+pooncelock+pooncelock+pombonce.litmus | 7 +-
...release+poacquirerelease+fencembonceonce.litmus | 6 +-
.../selftests/rcutorture/bin/console-badness.sh | 3 +-
.../testing/selftests/rcutorture/bin/functions.sh | 1 +
.../selftests/rcutorture/bin/kvm-check-branches.sh | 5 +-
.../rcutorture/bin/kvm-recheck-rcuscale.sh | 2 +-
.../selftests/rcutorture/bin/kvm-test-1-run.sh | 19 +-
tools/testing/selftests/rcutorture/bin/kvm.sh | 29 +-
.../selftests/rcutorture/bin/parse-console.sh | 2 +-
.../selftests/rcutorture/configs/rcu/SRCU-t | 3 +-
.../selftests/rcutorture/configs/rcu/SRCU-u | 3 +-
.../selftests/rcutorture/configs/rcu/TRACE01 | 6 +-
.../selftests/rcutorture/configs/rcu/TRACE02 | 6 +-
.../selftests/rcutorture/configs/rcuscale/CFcommon | 3 +
.../selftests/rcutorture/configs/rcuscale/TRACE01 | 15 +
.../rcutorture/configs/rcuscale/TRACE01.boot | 1 +
89 files changed, 1839 insertions(+), 325 deletions(-)
create mode 100644 tools/memory-model/Documentation/README
create mode 100644 tools/memory-model/Documentation/control-dependencies.txt
create mode 100644 tools/memory-model/Documentation/glossary.txt
create mode 100644 tools/memory-model/Documentation/ordering.txt
create mode 100644 tools/testing/selftests/rcutorture/configs/rcuscale/TRACE01
create mode 100644 tools/testing/selftests/rcutorture/configs/rcuscale/TRACE01.boot
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