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    Subject[PATCH 3/3] sparse provide pfn_to_nid
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    sparsemem: provide pfn_to_nid

    Before SPARSEMEM is initialised we cannot provide an efficient
    pfn_to_nid() implmentation; before initialisation is complete we use
    early_pfn_to_nid() to provide location information. Until recently
    there was no non-init user of this functionality. Provide a post
    init pfn_to_nid() implementation.

    Note that this implmentation assumes that the pfn passed has
    been validated with pfn_valid(). The current single user of this
    function already has this check.

    Signed-off-by: Andy Whitcroft <apw@shadowen.org>
    ---
    mmzone.h | 13 +++++--------
    1 file changed, 5 insertions(+), 8 deletions(-)
    diff -upN reference/include/linux/mmzone.h current/include/linux/mmzone.h
    --- reference/include/linux/mmzone.h
    +++ current/include/linux/mmzone.h
    @@ -598,14 +598,11 @@ static inline int pfn_valid(unsigned lon
    return valid_section(__nr_to_section(pfn_to_section_nr(pfn)));
    }

    -/*
    - * These are _only_ used during initialisation, therefore they
    - * can use __initdata ... They could have names to indicate
    - * this restriction.
    - */
    -#ifdef CONFIG_NUMA
    -#define pfn_to_nid early_pfn_to_nid
    -#endif
    +#define pfn_to_nid(pfn) \
    +({ \
    + unsigned long __pfn = (pfn); \
    + page_to_nid(pfn_to_page(pfn)); \
    +})

    #define early_pfn_valid(pfn) pfn_valid(pfn)
    void sparse_init(void);
    -
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