Whether we can use semaphore or mutex or spinlock in interrupt context in linux kernel?
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Answer Posted / Parmanand Singh
In Linux Kernel, neither semaphores nor mutexes nor spinlocks should be used directly within an interrupt handler. This is because the preempt_disable() function is typically called when entering an interrupt handler to prevent the scheduler from preempting the current task. However, if preempt_disable() is called, it disables all kernel preemption including mutexes and semaphores. Spinlocks can be used in interrupt handlers because they do not involve a context switch and thus no mutex or semaphore would be affected.
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