David Miller wrote:Replacing spin_lock() [current 8139too.c] with spin_lock_irqsave() results in a larger interrupt handler... more CPU instructions for the same result. The entire spin_lock() apparatus in the interrupt handler disappears nicely on uniprocessor machines. Plus, you are not competing with any other interrupts other than your own, which is the only major class of problems where spin_lock_irqsave() in interrupt handler is really needed (PS/2 kbd + mouse is an example). Or more simply, it's not needed, so nothing is gained by doing additional work in the hot path for the sake of consistency. Jeff --
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