Grant Grundler writes: > Ok this is good example - I see what the problem is. > You could use the following sequence too then: > pci_block_user_cfg_access > pci_save_state > block_ucfg_access = 1 > mb() > while (spin_is_locked(&pci_lock)) > relax_cpu(); > > Think this is sufficient?
Maybe, but it seems like a bad idea to me. It's longer, it's less obvious what's happening, and it precludes the sorts of optimization that we do on ppc64 where a cpu that is waiting for a lock can tell give its time slice to the cpu that is holding the lock (on systems where the hypervisor time-slices multiple virtual cpus on one physical cpu). What's wrong with just doing spin_lock/spin_unlock? Paul. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
