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SubjectRe: [PATCH v1 08/10] powerpc/mm: move __ioremap_at() and __iounmap_at() into ioremap.c
> +/**
> + * __iounmap_from - Low level function to tear down the page tables
> + * for an IO mapping. This is used for mappings that
> + * are manipulated manually, like partial unmapping of
> + * PCI IOs or ISA space.
> + */
> +void __iounmap_at(void *ea, unsigned long size)

The comment doesn't mention the function name. That's why I ususally
don't even add the function name so that it doesn't get out of sync.

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