On spin_lock_irq_save and disabling specific interrupts.

[Dave Tian]

The simple answer would be we do not want to be interrupted during a interrupt handler. For SMP, there are other CPUs which can respond to IRQs.

-daveti


> On Nov 2, 2014, at 2:30 PM, mind entropy <mindentropy at gmail.com> wrote:
> 
> Hi,
> 
> When I do spin_lock_irq it disables IRQ's which were enabled. What is
> the reason for disabling all the irq's rather than disabling the
> specific IRQ line which shares the resource? Wouldn't this be more
> efficient and would not lose any interrupts especially if I have a
> critical sensor ADC?
> 
> Thanks,
> Gautam.
> 
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