Re: Linux 2.4.1-ac15

[Philipp Rumpf]

On Thu, Feb 22, 2001 at 10:22:56AM +0000, Alan Cox wrote:
> > > We can take page faults in interrupt handlers in 2.4 so I had to use a 
> > > spinlock, but that sounds the same
> > 
> > We can?  Woah, please explain.
> 
> vmalloc does a lazy load of the tlb. That can lead to the exception table 
> being walked on an IRQ

But will that ever get to the search_exception_table code ?  (I don't
think that would be valid, but other exceptions in interrupts might be -
cf some of the self-modifying mmx copy versions).

Oh, like rdmsr_eio on SMP systems.  Definitely valid, and it can deadlock
with both the semaphore and the spinlock AFAICS.  Alan, is this an issue ?