[PATCH 0/4] Fix issues in check_irq_usage()

[Boqun Feng <boqun.feng@gmail.com>]

Hi Peter,

As we talked in IRC, Johannes Berg reported a problem and I could
reproduce by the selftest case in patch #4, there are three issues:

1)	printing of backwards dependency path doesn't work as expected,

2)	we have unnecessary and incorrect save_trace() call

3)	check_irq_usage() may result in a wrong depedency path (when a
	real one really exits).

Fix them separately in patch 1~3.

Regards,
Boqun

Boqun Feng (4):
  locking/lockdep: Fix the dep path printing for backwards BFS
  locking/lockdep: Remove the unnecessary trace saving
  lockding/lockdep: Avoid to find wrong lock dep path in
    check_irq_usage()
  locking/selftests: Add a selftest for check_irq_usage()

 kernel/locking/lockdep.c | 123 +++++++++++++++++++++++++++++++++++++--
 lib/locking-selftest.c   |  65 +++++++++++++++++++++
 2 files changed, 182 insertions(+), 6 deletions(-)

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2.30.2