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The ww_acquire_ctx structure for ww_mutex needs to persist for a complete lock/unlock cycle. In the ww_mutex test in locktorture, however, both ww_acquire_init() and ww_acquire_fini() are called within the lock function only. This causes a lockdep splat of "WARNING: Nested lock was not taken" when lockdep is enabled in the kernel. To fix this problem, we need to move the ww_acquire_fini() after the ww_mutex_unlock() in torture_ww_mutex_unlock(). This is done by allocating a global array of ww_acquire_ctx structures. Each locking thread is associated with its own ww_acquire_ctx via the unique thread id it has so that both the lock and unlock functions can access the same ww_acquire_ctx structure. Signed-off-by: Waiman Long <longman@redhat.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/20210318172814.4400-6-longman@redhat.com |
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| .. | ||
| irqflag-debug.c | ||
| lock_events_list.h | ||
| lock_events.c | ||
| lock_events.h | ||
| lockdep_internals.h | ||
| lockdep_proc.c | ||
| lockdep_states.h | ||
| lockdep.c | ||
| locktorture.c | ||
| Makefile | ||
| mcs_spinlock.h | ||
| mutex-debug.c | ||
| mutex-debug.h | ||
| mutex.c | ||
| mutex.h | ||
| osq_lock.c | ||
| percpu-rwsem.c | ||
| qrwlock.c | ||
| qspinlock_paravirt.h | ||
| qspinlock_stat.h | ||
| qspinlock.c | ||
| rtmutex_common.h | ||
| rtmutex-debug.c | ||
| rtmutex-debug.h | ||
| rtmutex.c | ||
| rtmutex.h | ||
| rwsem.c | ||
| semaphore.c | ||
| spinlock_debug.c | ||
| spinlock.c | ||
| test-ww_mutex.c | ||