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Subject[PATCH 0/3] Fix the workqueue and lockdep annotation issue
We introduced the following commit to detect deadlocks caused by
wait_for_completion() in flush_{workqueue, work}() and other locks. But
now LOCKDEP_COMPLETIONS is introduced, such works are automatically done

commit 4e6045f134784f4b158b3c0f7a282b04bd816887
workqueue: debug flushing deadlocks with lockdep

However, LOCKDEP_COMPLETIONS has limitation that it cannot report
deadlocks at the real time. So we have to leave some annotations for now,
but some redundant acquisitions can be removed. And we need to make
workqueue code co-work with LOCKDEP_COMPLETIONS.

Byungchul Park (3):
lockdep: Use enum type on hlock->read instead of magic number
lockdep: Introduce lock_acquire_might()
lockdep: Remove unnecessary acquisitions wrt workqueue flush

include/linux/lockdep.h | 2 ++
kernel/locking/lockdep.c | 56 ++++++++++++++++++++++++++++++++++--------------
kernel/workqueue.c | 18 +++++++---------
3 files changed, 50 insertions(+), 26 deletions(-)


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