linux-kernel - [PATCH 00/27] locking/lockdep: Add support for dynamic keys

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Date:   Wed, 28 Nov 2018 15:42:58 -0800
From:   Bart Van Assche <bvanassche@....org>
To:     mingo@...hat.com
Cc:     peterz@...radead.org, tj@...nel.org, johannes.berg@...el.com,
        linux-kernel@...r.kernel.org, Bart Van Assche <bvanassche@....org>
Subject: [PATCH 00/27] locking/lockdep: Add support for dynamic keys

Hi Ingo and Peter,

A known shortcoming of the current lockdep implementation is that it requires
lock keys to be allocated statically and that this key sharing can cause false
positive deadlock reports. This patch series adds support for dynamic keys in
the lockdep code. I'm not claiming that this patch series is perfect. However,
the code in this patch series survives nontrivial tests so I think it's worth
a look. Two unrelated changes in this patch series are:
- Improve the lockdep tests.
- Complain if no name has been assigned to a lock object.

Thanks,
    
Bart.

Bart Van Assche (27):
  lockdep tests: Display compiler warning and error messages
  lockdep tests: Fix shellcheck warnings
  lockdep tests: Improve testing accuracy
  lockdep tests: Run lockdep tests a second time under Valgrind
  liblockdep: Rename "trywlock" into "trywrlock"
  liblockdep: Add dummy print_irqtrace_events() implementation
  lockdep tests: Test the lockdep_reset_lock() implementation
  locking/lockdep: Declare local symbols static
  locking/lockdep: Inline __lockdep_init_map()
  locking/lockdep: Introduce lock_class_cache_is_registered()
  timekeeping: Assign a name to tk_core.seq.dep_map
  net/core: Assign a name to devnet_rename_seq.dep_map
  locking/lockdep: Complain if a lock object has no name
  locking/lockdep: Remove a superfluous INIT_LIST_HEAD() statement
  locking/lockdep: Make concurrent lockdep_reset_lock() calls safe
  locking/lockdep: Stop using RCU primitives to access all_lock_classes
  locking/lockdep: Make zap_class() remove all matching lock order
    entries
  locking/lockdep: Reorder struct lock_class members
  locking/lockdep: Retain the class key and name while freeing a lock
    class
  locking/lockdep: Free lock classes that are no longer in use
  locking/lockdep: Rename lock_list.entry into
    lock_list.lock_order_entry
  locking/lockdep: Reuse list entries that are no longer in use
  locking/lockdep: Check data structure consistency
  locking/lockdep: Introduce __lockdep_free_key_range()
  locking/lockdep: Add support for dynamic keys
  kernel/workqueue: Use dynamic lockdep keys for workqueues
  lockdep tests: Test dynamic key registration

 include/linux/lockdep.h                       |  45 +-
 include/linux/workqueue.h                     |  28 +-
 kernel/locking/lockdep.c                      | 640 +++++++++++++++---
 kernel/locking/lockdep_proc.c                 |   2 +-
 kernel/time/timekeeping.c                     |   4 +-
 kernel/workqueue.c                            |  60 +-
 net/core/dev.c                                |   2 +-
 tools/lib/lockdep/include/liblockdep/common.h |   3 +
 tools/lib/lockdep/include/liblockdep/mutex.h  |  12 +-
 tools/lib/lockdep/include/liblockdep/rwlock.h |   6 +-
 tools/lib/lockdep/lockdep.c                   |   5 +
 tools/lib/lockdep/run_tests.sh                |  38 +-
 tools/lib/lockdep/tests/AA.sh                 |   2 +
 tools/lib/lockdep/tests/ABA.sh                |   2 +
 tools/lib/lockdep/tests/ABBA.c                |  12 +
 tools/lib/lockdep/tests/ABBA.sh               |   2 +
 tools/lib/lockdep/tests/ABBA_2threads.sh      |   2 +
 tools/lib/lockdep/tests/ABBCCA.c              |   4 +
 tools/lib/lockdep/tests/ABBCCA.sh             |   2 +
 tools/lib/lockdep/tests/ABBCCDDA.c            |   5 +
 tools/lib/lockdep/tests/ABBCCDDA.sh           |   2 +
 tools/lib/lockdep/tests/ABCABC.c              |   4 +
 tools/lib/lockdep/tests/ABCABC.sh             |   2 +
 tools/lib/lockdep/tests/ABCDBCDA.c            |   5 +
 tools/lib/lockdep/tests/ABCDBCDA.sh           |   2 +
 tools/lib/lockdep/tests/ABCDBDDA.c            |   5 +
 tools/lib/lockdep/tests/ABCDBDDA.sh           |   2 +
 tools/lib/lockdep/tests/WW.sh                 |   2 +
 tools/lib/lockdep/tests/unlock_balance.c      |   2 +
 tools/lib/lockdep/tests/unlock_balance.sh     |   2 +
 30 files changed, 726 insertions(+), 178 deletions(-)
 create mode 100755 tools/lib/lockdep/tests/AA.sh
 create mode 100755 tools/lib/lockdep/tests/ABA.sh
 create mode 100755 tools/lib/lockdep/tests/ABBA.sh
 create mode 100755 tools/lib/lockdep/tests/ABBA_2threads.sh
 create mode 100755 tools/lib/lockdep/tests/ABBCCA.sh
 create mode 100755 tools/lib/lockdep/tests/ABBCCDDA.sh
 create mode 100755 tools/lib/lockdep/tests/ABCABC.sh
 create mode 100755 tools/lib/lockdep/tests/ABCDBCDA.sh
 create mode 100755 tools/lib/lockdep/tests/ABCDBDDA.sh
 create mode 100755 tools/lib/lockdep/tests/WW.sh
 create mode 100755 tools/lib/lockdep/tests/unlock_balance.sh

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2.20.0.rc0.387.gc7a69e6b6c-goog