s/occured/occurred/ in comments, log messages and man pages.

- don't return ENOMEM for errors not related to memory
- don't overload return values (-error/+size)
- don't allocate kernel memory from user supplied length.

Compilation of a kernel outside the build.sh framework exposed the
uninitialised usage of `error' in interrupt_avert_intr(). In theory it can
reach the `out' label without `error' initialized. No ide

Compilation of a kernel outside the build.sh framework exposed the
uninitialised usage of `error' in interrupt_avert_intr(). In theory it can
reach the `out' label without `error' initialized. No idea if that really ever
happens in practice.

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remove checks for failure after memory allocation calls that cannot fail:

kmem_alloc() with KM_SLEEP
kmem_zalloc() with KM_SLEEP
percpu_alloc()
pserialize_create()
psref_class_create()

al

remove checks for failure after memory allocation calls that cannot fail:

kmem_alloc() with KM_SLEEP
kmem_zalloc() with KM_SLEEP
percpu_alloc()
pserialize_create()
psref_class_create()

all of these paths include an assertion that the allocation has not failed,
so callers should not assert that again.

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Add kernel code to support intrctl(8).