>Could you use BUG_ON ? It might shave off a cycle or two.
No. BUG_ON(condition) should be able to be safely defined as
nothing for systems that want to run fast at the expense of having no
assertion debugging. Therefore, BUG_ON(condition) can only be used
when the condition has no relevant side-effects. In this case, the
condition does have an important side effect: it takes the lock. It
must be executed, regardless of whether the system is compiled for
assertion debugging or not. Therefore, BUG_ON() should not be used in
this case.
Adam J. Richter __ ______________ 575 Oroville Road
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