Messages in this thread | | | Date | Fri, 04 May 2001 20:14:37 +0200 | From | Manfred Spraul <> | Subject | Re: modularized SYSENTER support |
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> 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.
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