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Arrange the following levels of interrupt protection within the Linux kernel in order of increasing priority.
(a) User-mode programs
(b) Bottom-half interrupt handlers
(c) Kernel system service routines
(d) Top-half interrupt handlers
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Correct answer: B. (a), (c), (b), (d)

Explanation

Increasing priority: user-mode programs < kernel system-service routines < bottom-half handlers < top-half handlers.

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