Re: modularized SYSENTER support

[Manfred Spraul]

> Q. How come the handler doesn't manage so called "bottom halves" or 
>    "soft IRQs"? 
> A. There is no need for this. Soft IRQs can only appear at exit from 
>    hardware interrupt handlers. Indeed, we can't count on user app. 
>    being around and performing a system call when it comes to 
>    interrupt handling, right? 

That's probably a bug.
syscall
* spin_lock_bh()
* hardware interrupt arrives
* BH's are blocked, delayed
* spin_unlock_bh()
* return from syscall.

You must check for softirq's before returning.

--
	Manfred