Re: alpha bug in signal handling

[Richard Henderson]

On Wed, Dec 05, 2001 at 03:23:04AM -0800, David S. Miller wrote:
> I don't understand why this is even necessary.
> 
> What if the interrupt comes in on another processor.  How does this
> return from trap behavior avoid that interrupt modifying the signal
> and/or scheduling state wrt. the current cpu's task?

It doesn't.  But it also prevents the IPI from being recognized
until we are back in userland.  Apparently DMT had a test case
that failed without disabling interrupts; I didn't see it myself.

r~