Re: what is spinlock depth

From: Jiri Slaby
Date: Mon Jan 31 2011 - 16:06:23 EST

On 01/31/2011 09:27 PM, Sri Ram Vemulpali wrote:
> Hi all,
> I am reading spinlock code and looking at struct raw_spinlock. I found
> struct lockdep_map as member.
> which is defined as
> struct lockdep_map {
> struct lock_class_key *key;
> struct lock_class *class_cache[NR_LOCKDEP_CACHING_CLASSES];
> const char *name;
> int cpu;
> unsigned long ip;
> #endif
> };
> Can anyone help me explain, how this struct helps the spinlock. Why do
> we need lockdepth.

It's not dep-th, but dep-endency. It's a debugging technique to
dynamically check for locking correctness. See more details in

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