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SubjectRe: [PATCH 2.6.16-rc1-git4] accessfs: a permission managing filesystem
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On Mon, 2006-01-30 at 11:25 +0100, Jan Engelhardt wrote:
> >> You can't do that.
> >
> >Exactly why not? Assuming there are zero users left in the kernel.....
> >(which highly obviously is a prerequisite for even thinking about such a
> >step)
>
> Documentation/mutex-design.txt:
> * - mutexes may not be used in irq contexts
>
> I need some locking strategy within irq contexts, and that suggests
> semaphores do the job.

well... maybe.
If you need to mess inside irq context, spinlocks sound more the right
thing. Or if you need to do a "I'm done" in the irq and a "sleep until
done" thing in process context, then you really should use completions
instead.


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