mask out an irq line

[cheneydeng]

hi all,
    I know that when an interrupt handler is excuting, the irq line which generated the signal will be masked out,however,if the line is shared by many device.Will all be masked out or just the one which is handling now be masked out ?Doed it tell the difference by the forth argument of request_irq() ? 
 

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best regards！
  cheneydeng
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