From: Manfred Spraul <manfred@colorfullife.com>
To: appro@fy.chalmers.se
Cc: linux-kernel@vger.kernel.org
Subject: Re: modularized SYSENTER support
Date: Fri, 04 May 2001 20:14:37 +0200 [thread overview]
Message-ID: <3AF2F18D.15A52CD9@colorfullife.com> (raw)
> 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
next reply other threads:[~2001-05-04 18:14 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-05-04 18:14 Manfred Spraul [this message]
-- strict thread matches above, loose matches on Subject: below --
2001-05-04 15:21 modularized SYSENTER support Andy Polyakov
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