Re: lockdep and threaded IRQs (was: ...)

On Monday 02 March 2009, Peter Zijlstra wrote:

quoted

But if that's what is keeping you from fixing the lockdep bug,
why haven't you submitted patches to remove IRQF_DISABLED from
the kernel, and update all the drivers relying on IRQs being
enabled when their handlers run?

I did so today. Just didn't realize things actually relied on it since
lockdep turned them off and my system has been working fine.

That patch did no such thing.  It added a BUG_ON(),
which has nothing to do with removing IRQF_DISABLED.

Your driver needs threaded interrupts, Thomas is working on that now,
and I saw a conversion of your driver to use that.

Thomas hasn't yet touched the issue of how to chain such IRQs
though ... I consider his v2 patches a decent start, with some
limitations that could be attributed to an x86 focus.

IDE PIO can hopefully also be converted to threaded interrupts.

I have worked with ARMs with IDE support.  That's become
rare in new chips though, even for CF cards; it needs too
many signal wires.

- Dave