On Tue, Apr 08, 2014 at 10:33:55AM -0700, Linus Torvalds wrote: > Hmm. And let's think about that powerpc race, where "spin_is_locked()" > can be false when somebody is waiting to get the lock..
Right; so in the original discussion I never really got to why that is a problem. A pending waiter cannot modify the wait list, so either we see the current holder, or we see a stable list. So I had to hop on a plane while that discussion was happening and while I did briefly task to Davidlohr in Napa his explanation didn't stick in my jet-leg addled brain. Afterwards the discussion got lost in the pile of unread mail. I'll go re-read that discussion and look up this thread to see if things will start to make sense. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
