Re: [PATCH] 2.5.29: some compilation fixes for irq frenzy [OSS +

[Alan Cox]

On Tue, 2002-07-30 at 22:19, Andy Pfiffer wrote:
> As luck would have it, I booted the kernel and played the tunes on a
> 2-way P4 Xeon system.  Nothing wedged, but then again, I didn't try to
> break it.
> 
> So, what did I break?

SMP support I think. A lot of the save_flags/cli stuff you changed looks
like it needs to also lock out interrupts on the other processors,
otherwise you can get a DMA pointer being updated under you.