examples of `<hardirq-safe> -> <hardirq-unsafe>`

[孙建希]

Hi,

I am reading lockdep document.

http://www.cs.fsu.edu/~baker/devices/lxr/http/source/linux/Documentation/lockdep-design.txt?v=2.6.25


Could anyone give me same  dead lock examples of `<hardirq-safe>   ->
 <hardirq-unsafe>`.
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