Hi Peter and Ingo, This patchset proposes a general read-write lock deadlock detection algorithm on the premise that exclusive locks can be seen as a special/partial usage of read-write locks. The current Linux kernel locks are all considered in this algorithm. Prominently, the recursive-read lock can be well supported, which has not been for more than a decade.
The bulk of the algorithm is in patch #27. Now that the recursive-read locks are suppported, we have all the 262 cases passed. Please, some of the minor fix and/or no-functional-change patches may be reviewed at least. Changes from v3: - Reworded some changelogs - Rebased to current code base - Per Boqun's suggestion, reordered patches - Much more time elapsed Changes from v2: - Handle correctly rwsem locks hopefully. - Remove indirect dependency redundancy check. - Check direct dependency redundancy before validation. - Compose lock chains for those with trylocks or separated by trylocks. - Map lock dependencies to lock chains. - Consolidate forward and backward lock_lists. - Clearly and formally define two-task model for lockdep. -- Yuyang Du (30): locking/lockdep: Rename deadlock check functions locking/lockdep: Change return type of add_chain_cache() locking/lockdep: Change return type of lookup_chain_cache_add() locking/lockdep: Pass lock chain from validate_chain() to check_prev_add() locking/lockdep: Add lock chain list_head field in struct lock_list and lock_chain locking/lockdep: Update comments in struct lock_list and held_lock locking/lockdep: Remove indirect dependency redundancy check locking/lockdep: Skip checks if direct dependency is already present locking/lockdep: Remove chain_head argument in validate_chain() locking/lockdep: Remove useless lock type assignment locking/lockdep: Remove irq-safe to irq-unsafe read check locking/lockdep: Specify the depth of current lock stack in lookup_chain_cache_add() locking/lockdep: Treat every lock dependency as in a new lock chain locking/lockdep: Combine lock_lists in struct lock_class into an array locking/lockdep: Consolidate forward and backward lock_lists into one locking/lockdep: Add lock chains to direct lock dependency graph locking/lockdep: Use lock type enum to explicitly specify read or write locks ocking/lockdep: Add read-write type for a lock dependency locking/lockdep: Add helper functions to operate on the searched path locking/lockdep: Update direct dependency's read-write type if it exists locking/lockdep: Introduce chain_hlocks_type for held lock's read-write type locking/lockdep: Hash held lock's read-write type into chain key locking/lockdep: Adjust BFS algorithm to support multiple matches locking/lockdep: Define the two task model for lockdep checks formally locking/lockdep: Introduce mark_lock_unaccessed() locking/lockdep: Add nest lock type locking/lockdep: Add lock exclusiveness table locking/lockdep: Support read-write lock's deadlock detection locking/lockdep: Adjust selftest case for recursive read lock locking/lockdep: Add more lockdep selftest cases include/linux/lockdep.h | 91 ++- include/linux/rcupdate.h | 2 +- kernel/locking/lockdep.c | 1227 ++++++++++++++++++++++++------------ kernel/locking/lockdep_internals.h | 3 +- kernel/locking/lockdep_proc.c | 8 +- lib/locking-selftest.c | 1109 +++++++++++++++++++++++++++++++- 6 files changed, 1981 insertions(+), 459 deletions(-) -- 1.8.3.1