On Wed, 2006-08-16 at 09:43 -0700, Roland Dreier wrote:
> Arjan, here's a case that disproves your rule of thumb that rwsems
> are equivalent to mutexes as far as correctness goes: you can't have
> an AB-BA deadlock with nested rwsems when using down_read(). In other
> words, the following:
>
> down_read(&lock_1);
> down_read(&lock_2);
> down_read(&lock_2);
> down_read(&lock_1);
>
> is perfectly safe
it's safe as long as you never ever do a down_write nested inside or
outside a down_read of any of these locks....
--
if you want to mail me at work (you don't), use arjan (at) linux.intel.com
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