On Mon, Jun 30, 2014 at 11:49:40AM -0400, Jeff Layton wrote: > We currently have the ability to call lockdep_assert_held to throw a > warning when a spinlock isn't held in a codepath. There are also times > when we'd like to throw a warning when a lock is held (i.e. when there > is the potential for deadlock with atomic_dec_and_lock or similar). So I'm not getting it; if there's deadlock potential, lockdep would already report so, right? That is, lockdep is very good a yelling when you try to acquire a lock you're already holding.
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