Re: interrupt checks for spinlocks

[William Lee Irwin III]

From: William Lee Irwin III <[e-mail]>
>>>> (1) check that spinlocks are not taken in interrupt context without
>>>> 	interrupts disabled

At some point in the past, Pete Zaitcev wrote:
>>> Bill, why is this bad? I routinely use this technique.

From: William Lee Irwin III <[e-mail]>
>> If you receive the same interrupt on the same cpu and re-enter code
>> that does that, you will deadlock.

On Sun, Nov 03, 2002 at 07:42:49PM -0500, Pete Zaitcev wrote:
> How would that happen? I thought it was not possible to re-enter
> an interrupt, and that it was pretty fundamental for Linux.
> When did we allow it, and what are implications for architectures?

This non-reentrant stuff hurts my head. Another patch down the
toilet, I guess.

Bill