Peter ZijlstraandGreg Kroah-Hartman 7b64ab9660 debugobjects,locking: Annotate debug_object_fill_pool() wait type violation ...

commit 0cce06ba85 upstream.

There is an explicit wait-type violation in debug_object_fill_pool()
for PREEMPT_RT=n kernels which allows them to more easily fill the
object pool and reduce the chance of allocation failures.

Lockdep's wait-type checks are designed to check the PREEMPT_RT
locking rules even for PREEMPT_RT=n kernels and object to this, so
create a lockdep annotation to allow this to stand.

Specifically, create a 'lock' type that overrides the inner wait-type
while it is held -- allowing one to temporarily raise it, such that
the violation is hidden.

Reported-by: Vlastimil Babka <vbabka@suse.cz>
Reported-by: Qi Zheng <zhengqi.arch@bytedance.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Qi Zheng <zhengqi.arch@bytedance.com>
Link: https://lkml.kernel.org/r/20230429100614.GA1489784@hirez.programming.kicks-ass.net
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2026-07-04 13:41:28 +02:00

..

irqflag-debug.c

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lock_events_list.h

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lock_events.c

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lock_events.h

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lockdep_internals.h

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lockdep_proc.c

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lockdep_states.h

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lockdep.c

debugobjects,locking: Annotate debug_object_fill_pool() wait type violation

2026-07-04 13:41:28 +02:00

locktorture.c

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Makefile

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mcs_spinlock.h

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mutex-debug.c

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mutex.c

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mutex.h

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osq_lock.c

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percpu-rwsem.c

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qrwlock.c

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qspinlock_paravirt.h

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qspinlock_stat.h

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qspinlock.c

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rtmutex_api.c

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rtmutex_common.h

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rtmutex.c

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rwbase_rt.c

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rwsem.c

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semaphore.c

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spinlock_debug.c

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spinlock_rt.c

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spinlock.c

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test-ww_mutex.c

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ww_mutex.h

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ww_rt_mutex.c

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