Re: [Patch 0/2] sysfs: fix s_active lockdep warning

[Greg KH]

On Fri, Jan 29, 2010 at 07:14:20PM +0100, Peter Zijlstra wrote:
> On Fri, 2010-01-29 at 10:10 -0800, Greg KH wrote:
> > On Fri, Jan 29, 2010 at 06:57:28PM +0100, Peter Zijlstra wrote:
> > > On Fri, 2010-01-29 at 06:22 -0800, Greg KH wrote:
> > > > 
> > > > Heh, this whole mess is the very reason we didn't add lockdep support to
> > > > the driver core.  Nested devices that all look alike from the driver
> > > > core, are really different objects and the locking lifetimes are
> > > > separate, but lockdep can't see that. 
> > > 
> > > And here I through Alan Stern had a handle on making the driver core
> > > play nice.
> > 
> > It's not the driver core that is the issue here, it's that lockdep can't
> > handle the tree structure of devices that is represented in the kernel.
> > 
> > I don't think it is a driver core problem, but rather, a lockdep issue.
> 
> Right, we've been over that and I think I added enough lockdep
> annotations to make it work for the device tree. At least, Alan and I
> seemed to agree on that last time we talked about it.

Ah, I didn't realize that, very nice.

If so, then this sysfs lock stuff should be able to use those
annotations and we shouldn't have this issue, right?

thanks,

greg k-h
--
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/