Re: what is spinlock depth

[WANG Cong]

On Mon, 31 Jan 2011 15:27:08 -0500, Sri Ram Vemulpali wrote:

> Hi all,
> 
> I am reading spinlock code and looking at struct raw_spinlock. I found
> struct lockdep_map as member.
...
> Can anyone help me explain, how this struct helps the spinlock. Why do
> we need lockdepth.

Here "lockdep" is short for Lock Dependence, not Lock Depth.

We do have lock depth things, e.g. ->lock_depth of struct task_struct,
which means the nested level of BKL. But spinlock can't be nested.

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