Boqun Feng 95f0958240 locking/lockdep: Decrease nr_unused_locks if lock unused in zap_class() ... commit 495f53d5cc upstream. Currently, when a lock class is allocated, nr_unused_locks will be increased by 1, until it gets used: nr_unused_locks will be decreased by 1 in mark_lock(). However, one scenario is missed: a lock class may be zapped without even being used once. This could result into a situation that nr_unused_locks != 0 but no unused lock class is active in the system, and when `cat /proc/lockdep_stats`, a WARN_ON() will be triggered in a CONFIG_DEBUG_LOCKDEP=y kernel: [...] DEBUG_LOCKS_WARN_ON(debug_atomic_read(nr_unused_locks) != nr_unused) [...] WARNING: CPU: 41 PID: 1121 at kernel/locking/lockdep_proc.c:283 lockdep_stats_show+0xba9/0xbd0 And as a result, lockdep will be disabled after this. Therefore, nr_unused_locks needs to be accounted correctly at zap_class() time. Signed-off-by: Boqun Feng <boqun.feng@gmail.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Reviewed-by: Waiman Long <longman@redhat.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20250326180831.510348-1-boqun.feng@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2025-04-20 10:15:45 +02:00
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Makefile	…
irqflag-debug.c	…
lock_events.c	…
lock_events.h	…
lock_events_list.h	…
lockdep.c	locking/lockdep: Decrease nr_unused_locks if lock unused in zap_class()	2025-04-20 10:15:45 +02:00
lockdep_internals.h	…
lockdep_proc.c	locking/lockdep: Simplify character output in seq_line()	2024-08-06 10:46:43 -07:00
lockdep_states.h	…
locktorture.c	locktorture: Add MODULE_DESCRIPTION()	2024-05-30 15:31:45 -07:00
mcs_spinlock.h	…
mutex-debug.c	…
mutex.c	…
mutex.h	…
osq_lock.c	…
percpu-rwsem.c	…
qrwlock.c	…
qspinlock.c	x86/xen: remove deprecated xen_nopvspin boot parameter	2024-07-11 16:33:51 +02:00
qspinlock_paravirt.h	locking/pvqspinlock: Correct the type of "old" variable in pv_kick_node()	2024-07-29 12:16:21 +02:00
qspinlock_stat.h	…
rtmutex.c	In the v6.12 scheduler development cycle we had 63 commits from 18 contributors:	2024-09-19 15:55:58 +02:00
rtmutex_api.c	…
rtmutex_common.h	…
rwbase_rt.c	…
rwsem.c	Locking changes for v6.12:	2024-09-29 08:51:30 -07:00
semaphore.c	locking/semaphore: Use wake_q to wake up processes outside lock critical section	2025-04-10 14:39:31 +02:00
spinlock.c	locking/local_lock: Add local nested BH locking infrastructure.	2024-06-24 16:41:22 -07:00
spinlock_debug.c	…
spinlock_rt.c	…
test-ww_mutex.c	locking/ww_mutex/test: Use swap() macro	2025-02-17 10:04:44 +01:00
ww_mutex.h	sched/rt: Rename realtime_{prio, task}() to rt_or_dl_{prio, task}()	2024-08-07 18:32:38 +02:00
ww_rt_mutex.c	…