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drivers: intc: plic: use per-instance spinlock #80187

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@ycsin ycsin commented Oct 22, 2024

Instead of doing an irq_lock(), use per-instance spinlock instead.

Instead of doing an `irq_lock()`, use per-instance spinlock instead.

Signed-off-by: Yong Cong Sin <ycsin@meta.com>
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