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The Linux kernel configuration item CONFIG_LINUX_CLI_LEVEL
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local_irq_disable() doesn't actually disable maskable interrupts - what it does is restrict the levels of interrupt which are permitted (a lower level indicates a higher priority) by lowering the value in EPSW.IM from 7. Any interrupt is permitted for which the level is lower than EPSW.IM.
Certain interrupts, such as DEBUGGER and virtual MN10300 on-chip serial DMA interrupts are allowed to interrupt normal disabled sections.
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