Can kmem_cache_free block?

[Steve French]

Is kmem_cache_free safe to call while holding a spinlock (can
kmem_cache_free ever block or recurse into a file system)?

I see it trying to grab just another spinlock which is probably fine
(but was worried whether any of the worker functions called a sem) ...
my assumption is that it would be safe, but the man page doesn't
mention when it can be used safely.

-- 
Thanks,

Steve
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