Re: Deadlock scenario in regulator core

[Peter Zijlstra]

On Wed, 2011-03-23 at 10:42 +0000, Mark Brown wrote:
> 
> That's helpful, though it doesn't really say anything about how one
> picks subclass? 

With care ;-)

Its most useful for recursive use of the same lock class, typically we
only have 2 locks held and we can use the SINGLE_DEPTH_NESTING thing.
Some few sites use subclasses for larger things, some are ok, some are
dubious (ext4 comes to mind).

And like said in the other email, be careful with lockdep annotations,
you can actually annotate real deadlocks away.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/