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SubjectRe: Disabling interrupts in 2.4.x
> The only thing I am sure of is that interrupts are simply not disabled.

They are only disabled on the local CPU, they could still occur on other
CPUs. This is not different from 2.2.

> I've also looked at some other scsi drivers that are disabling interrupts
> and they appear to be making similar calls to spin_lock_irqsave.
> Does anyone have any suggestions for debugging this? Is there a call that
> can be made to find out if interrupts are actually disabled?

unsigned flag;
asm volatile("pushfl ; popfl %0" : "=r" (flag));
printk(KERN_DEBUG "local interrupts are %s\n", (flag & (1<<9)) ? "enabled" : "disabled");

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