* Time hard-ISR, timer_interrupt( ) calls spin_unlock_irq several times.
* Here local_irq_enable( ) shd not re-enable lower priority interrupts
* -If called from soft-ISR, it must re-enable all interrupts
* Time hard-ISR, timer_interrupt( ) calls spin_unlock_irq several times.
* Here local_irq_enable( ) shd not re-enable lower priority interrupts
* -If called from soft-ISR, it must re-enable all interrupts
* must be enabled while they run.
* Now hardware context wise we may still be in L2 ISR (not done rtie)
* still we must re-enable both L1 and L2 IRQs
* must be enabled while they run.
* Now hardware context wise we may still be in L2 ISR (not done rtie)
* still we must re-enable both L1 and L2 IRQs