Re: [PATCH 2/2] workqueue: debug work related deadlocks withlockdep

[Johannes Berg]

On Thu, 2007-07-05 at 19:36 +0400, Oleg Nesterov wrote:

> So, __WORK_INITIALIZER() uses work_struct itself as a "struct lock_class_key" ?
> How so?

Well, this is for work_structs that are static (not dynamically
allocated.) struct lock_class_key is just a single byte because its
whole purpose is to be a unique pointer, there's nothing actually in it.
Hence, taking the address of the work struct (when it's statically
allocated) is a unique pointer just as well.

johannes

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