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Message-ID: <20201012135800.GA3240531@gmail.com>
Date: Mon, 12 Oct 2020 15:58:00 +0200
From: Ingo Molnar <mingo@...nel.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Thomas Gleixner <tglx@...utronix.de>,
Will Deacon <will@...nel.org>
Subject: [GIT PULL] locking changes for v5.10
Linus,
Please pull the latest locking/core git tree from:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git locking-core-2020-10-12
# HEAD: 2116d708b0580c0048fc80b82ec4b53f4ddaa166 Merge branch 'lkmm' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into locking/core
These are the locking updates for v5.10:
- Add deadlock detection for recursive read-locks. The rationale is outlined
in:
224ec489d3cd: ("lockdep/Documention: Recursive read lock detection reasoning")
The main deadlock pattern we want to detect is:
TASK A: TASK B:
read_lock(X);
write_lock(X);
read_lock_2(X);
- Add "latch sequence counters" (seqcount_latch_t):
A sequence counter variant where the counter even/odd value is used to
switch between two copies of protected data. This allows the read path,
typically NMIs, to safely interrupt the write side critical section.
We utilize this new variant for sched-clock, and to make x86 TSC handling safer.
- Other seqlock cleanups, fixes and enhancements
- KCSAN updates
- LKMM updates
- Misc updates, cleanups and fixes.
Note that there's a pending bugreport against:
4d004099a668: ("lockdep: Fix lockdep recursion")
this fix triggers a non-fatal RCU warning on some systems - but that looks
like a real bug which was masked by a lockdep bug, with fixes being worked
on and tested. The new boot time warning does not appear to be widespread
(read: we couldn't reproduce it locally).
Thanks,
Ingo
------------------>
Ahmed S. Darwish (13):
time/sched_clock: Use raw_read_seqcount_latch() during suspend
mm/swap: Do not abuse the seqcount_t latching API
seqlock: Introduce seqcount_latch_t
time/sched_clock: Use seqcount_latch_t
timekeeping: Use seqcount_latch_t
x86/tsc: Use seqcount_latch_t
rbtree_latch: Use seqcount_latch_t
seqlock: seqcount latch APIs: Only allow seqcount_latch_t
seqlock: seqcount_LOCKNAME_t: Standardize naming convention
seqlock: Use unique prefix for seqcount_t property accessors
seqlock: seqcount_t: Implement all read APIs as statement expressions
seqlock: seqcount_LOCKNAME_t: Introduce PREEMPT_RT support
seqlock: PREEMPT_RT: Do not starve seqlock_t writers
Alexander A. Klimov (1):
Replace HTTP links with HTTPS ones: LKMM
Boqun Feng (20):
locking: More accurate annotations for read_lock()
lockdep/Documention: Recursive read lock detection reasoning
lockdep: Demagic the return value of BFS
lockdep: Make __bfs() visit every dependency until a match
lockdep: Reduce the size of lock_list::distance
lockdep: Introduce lock_list::dep
lockdep: Extend __bfs() to work with multiple types of dependencies
lockdep: Make __bfs(.match) return bool
lockdep: Support deadlock detection for recursive read locks in check_noncircular()
lockdep: Adjust check_redundant() for recursive read change
lockdep: Fix recursive read lock related safe->unsafe detection
lockdep: Add recursive read locks into dependency graph
lockdep/selftest: Add a R-L/L-W test case specific to chain cache behavior
lockdep: Take read/write status in consideration when generate chainkey
lockdep/selftest: Unleash irq_read_recursion2 and add more
lockdep/selftest: Add more recursive read related test cases
Revert "locking/lockdep/selftests: Fix mixed read-write ABBA tests"
locking/selftest: Add test cases for queued_read_lock()
lockdep/selftest: Introduce recursion3
lockdep: Optimize the memory usage of circular queue
Marco Elver (19):
kcsan: Add support for atomic builtins
objtool: Add atomic builtin TSAN instrumentation to uaccess whitelist
kcsan: Add atomic builtin test case
kcsan: Support compounded read-write instrumentation
objtool, kcsan: Add __tsan_read_write to uaccess whitelist
kcsan: Skew delay to be longer for certain access types
kcsan: Add missing CONFIG_KCSAN_IGNORE_ATOMICS checks
kcsan: Test support for compound instrumentation
instrumented.h: Introduce read-write instrumentation hooks
asm-generic/bitops: Use instrument_read_write() where appropriate
locking/atomics: Use read-write instrumentation for atomic RMWs
kcsan: Simplify debugfs counter to name mapping
kcsan: Simplify constant string handling
kcsan: Remove debugfs test command
kcsan: Show message if enabled early
kcsan: Use pr_fmt for consistency
kcsan: Optimize debugfs stats counters
bitops, kcsan: Partially revert instrumentation for non-atomic bitops
kcsan: Use tracing-safe version of prandom
Marta Rybczynska (1):
Documentation/locking/locktypes: Fix local_locks documentation
Paul Bolle (1):
locking/atomics: Check atomic-arch-fallback.h too
Paul E. McKenney (4):
tools/memory-model: Update recipes.txt prime_numbers.c path
tools/memory-model: Improve litmus-test documentation
tools/memory-model: Add a simple entry point document
tools/memory-model: Expand the cheatsheet.txt notion of relaxed
Peter Zijlstra (5):
seqlock,tags: Add support for SEQCOUNT_LOCKTYPE()
locking/refcount: Provide __refcount API to obtain the old value
lockdep: Fix usage_traceoverflow
lockdep: Fix lockdep recursion
lockdep: Revert "lockdep: Use raw_cpu_*() for per-cpu variables"
Randy Dunlap (1):
seqlock: Fix multiple kernel-doc warnings
Sebastian Andrzej Siewior (1):
locking/seqlock: Tweak DEFINE_SEQLOCK() kernel doc
peterz@...radead.org (1):
seqlock: Unbreak lockdep
Documentation/locking/lockdep-design.rst | 258 +++++
Documentation/locking/seqlock.rst | 18 +
arch/x86/kernel/tsc.c | 10 +-
include/asm-generic/atomic-instrumented.h | 330 +++---
include/asm-generic/bitops/instrumented-atomic.h | 6 +-
include/asm-generic/bitops/instrumented-lock.h | 2 +-
.../asm-generic/bitops/instrumented-non-atomic.h | 30 +-
include/linux/instrumented.h | 30 +
include/linux/kcsan-checks.h | 45 +-
include/linux/lockdep.h | 58 +-
include/linux/lockdep_types.h | 8 +-
include/linux/rbtree_latch.h | 6 +-
include/linux/refcount.h | 65 +-
include/linux/seqlock.h | 388 ++++---
kernel/kcsan/core.c | 210 +++-
kernel/kcsan/debugfs.c | 130 +--
kernel/kcsan/kcsan-test.c | 128 ++-
kernel/kcsan/kcsan.h | 12 +-
kernel/kcsan/report.c | 10 +-
kernel/kcsan/selftest.c | 8 +-
kernel/locking/lockdep.c | 977 ++++++++++++------
kernel/locking/lockdep_internals.h | 7 +-
kernel/time/sched_clock.c | 6 +-
kernel/time/timekeeping.c | 10 +-
lib/Kconfig.kcsan | 5 +
lib/locking-selftest.c | 445 +++++++-
mm/swap.c | 65 +-
scripts/Makefile.kcsan | 2 +-
scripts/atomic/check-atomics.sh | 1 +
scripts/atomic/gen-atomic-instrumented.sh | 21 +-
scripts/tags.sh | 2 +
tools/memory-model/Documentation/cheatsheet.txt | 33 +-
tools/memory-model/Documentation/litmus-tests.txt | 1074 ++++++++++++++++++++
tools/memory-model/Documentation/recipes.txt | 4 +-
tools/memory-model/Documentation/references.txt | 2 +-
tools/memory-model/Documentation/simple.txt | 271 +++++
tools/memory-model/README | 160 +--
tools/objtool/check.c | 55 +
38 files changed, 3900 insertions(+), 992 deletions(-)
create mode 100644 tools/memory-model/Documentation/litmus-tests.txt
create mode 100644 tools/memory-model/Documentation/simple.txt
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