Messages in this thread | | | Date | Wed, 14 Mar 2007 17:15:13 -0700 (PDT) | From | Davide Libenzi <> | Subject | Re: [patch 13/13] signalfd/timerfd/asyncfd v5 - KAIO asyncfd support (example/maybe-broken) ... |
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On Wed, 14 Mar 2007, Linus Torvalds wrote:
> On Wed, 14 Mar 2007, Davide Libenzi wrote: > > > > > > That won't work. aio_complete() is supposed to be irq safe. > > > > Can you point me to a kernel path that ends up calling aio_complete() in a > > do-not-sleep mode? > > All of them. > > It's called from dio_bio_end_aio(), which is the bi_end_io function for an > AIO action. Which in turn is called at IO completion time. > > Which is basically _always_ interrupt context. > > So you cannot sleep. It's not about holding spinlocks (which it might well > do as well). It's about a much more fundamental issue: you can only sleep > in process context, not from interrupts.
Ack! Gotcha. Sigh! :)
- Davide
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