what is spinlock depth

lockdep finds out dependency in locking order at runtime. More on this
in kernel documentation linux/Documentation/lockdep-design.txt

Rajat

On Tue, Feb 1, 2011 at 1:57 AM, Sri Ram Vemulpali
[off-list ref] 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;
#ifdef CONFIG_LOCK_STAT
? ? ? int ? ? ? ? ? ? ? ? ? ? ? ? ? ? cpu;
? ? ?unsigned long ? ? ? ? ? ? ? ? ? ip;
#endif
};

Can anyone help me explain, how this struct helps the spinlock. Why do
we need lockdepth.
Thanks for help in advance.
--
Regards,
Sri.

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