Can interrupt be missed between interrupt disable/enable window?

Vishwas Srivastava vishu.kernel at gmail.com
Mon Mar 21 03:11:54 EDT 2016


Kernel code heavily uses the spinlock primitives
spin_lock_irqsave/restore plus local interrupt disabling/ enabling, all
across the code.
Is there a possibility that the interrupts might get
missed in this small window

disable interrupts
.............
.............                        <<<<<<<<<<<----------------------
interrupts is trigerred here

enable interrupts


specially when the irq
affinity has been set to the same core on which the
above mentioned code (disabling / enabling the irq's)
runs?
How the linux deals with this kind of scenario?
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