Re: [PATCH v4 2/9] x86: support kmap_atomic_pfn_t() for persistent memory

[Christoph Hellwig]

Btw, I don't think this actually is safe without refcounting your kmap
structure.

The driver model ->remove callback can be called at any time, which
will ioremap the memory and remap the kmap structure.  But at this
point a user might still be using it.
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