Preemption VS Interrupts

[Ajay Garg]

Hi everyone.

The API "spin_lock" disables preemption on the local processor.
The API "spin_lock_irqsave" disables preemption on the local
processor, and also disables interrupts on the local processor.

Thus, is disabling-interrupt independent of preemption?
In other words, can an interrupt still "preempt" a critical section
code even if preemption is disabled in the general sense (on a
non-preemptive kernel for example)?


Will be grateful for help in this regard, as it will clear up the
fuzziness going in my head.
Many thanks in advance !


Thanks and Regards,
Ajay