why both kernel lock as well as semaphore

From: Sourav Sen (sourav@csa.iisc.ernet.in)
Date: Sat Dec 23 2000 - 07:45:41 EST

In many parts of the kernel, I have seen both semaphore is taken
(eg. down(&current->mm->mmap_sem)) as well as kernel lock (lock_kernel())
is also taken, why both are required? Whats the purpose of each?

~sourav

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