On Fri, 26 Oct 2012, Oleg Nesterov wrote:
> > The code is different, but it can be changed to use percpu rw semaphores > > (if we add percpu_down_write_trylock). > > I don't really understand how you can make percpu_down_write_trylock() > atomic so that it can be called under br_write_lock(vfsmount_lock) in > sb_prepare_remount_readonly(). So I guess you also need to replace > vfsmount_lock at least. Or _trylock needs the barriers in _down_read. > Or I missed something. > > Oleg. That's true - that code is under spinlock and you can't implement non-blocking percpu_down_write_trylock. Mikulas -- 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/
