Re: spin_lock and linux philosophy question...

Werner Almesberger (almesber@lrc.di.epfl.ch)
Sun, 19 Sep 1999 17:56:16 +0200

Benjamin LaHaise wrote:
> a) a process may never block while holding a spinlock

Except the kernel_lock.

> b) an interrupt context may never end while still holding a
> spinlock

Are you sure ? Sure, all the cases I can imagine where you'd hold a
different number of spinlocks on entry and on exit have "wrong design"
written all over them (maybe except for managing hot-pluggable CPUs ;-),
but I don't see where this case would be flagged as strictly illegal.

- Werner

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 / Werner Almesberger, ICA, EPFL, CH       werner.almesberger@ica.epfl.ch /
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