From: Anton Ivanov
1. Removes the need to walk the IRQ/Device list to determine
who triggered the IRQ.
2. Improves scalability (up to several times performance
improvement for cases with 10s of devices).
3. Improves UML baseline IO performance for one disk + one NIC
use case by up to 10%.
4. Intr
Follows a version of the patch after a style cleanup. Functionality
features and code have no material changes compared to previous version.
A.
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