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    Subject[PATCH 1/2] flatmem split out memory model
    pfn_to_nid is memory model specific

    The pfn_to_nid() call is memory model specific. It represents the
    locality identifier for the memory passed. Classically this would
    be a NUMA node, but not a chunk of memory under DISCONTIGMEM.

    The SPARSEMEM and FLATMEM memory model non-NUMA versions of
    pfn_to_nid() are folded together under NEED_MULTIPLE_NODES, while
    DISCONTIGMEM has its own optimisation. This is all very confusing.

    This patch splits out each implementation of pfn_to_nid() so that we
    can see them and the optimisations to each.

    Signed-off-by: Andy Whitcroft <>
    mmzone.h | 7 ++++++-
    1 files changed, 6 insertions(+), 1 deletion(-)
    diff -upN reference/include/linux/mmzone.h current/include/linux/mmzone.h
    --- reference/include/linux/mmzone.h
    +++ current/include/linux/mmzone.h
    @@ -445,7 +445,6 @@ extern struct pglist_data contig_page_da
    #define NODE_DATA(nid) (&contig_page_data)
    #define NODE_MEM_MAP(nid) mem_map
    #define MAX_NODES_SHIFT 1
    -#define pfn_to_nid(pfn) (0)


    @@ -480,6 +479,10 @@ extern struct pglist_data contig_page_da
    #define early_pfn_to_nid(nid) (0UL)

    +#ifdef CONFIG_FLATMEM
    +#define pfn_to_nid(pfn) (0)
    #define pfn_to_section_nr(pfn) ((pfn) >> PFN_SECTION_SHIFT)
    #define section_nr_to_pfn(sec) ((sec) << PFN_SECTION_SHIFT)

    @@ -604,6 +607,8 @@ static inline int pfn_valid(unsigned lon
    #ifdef CONFIG_NUMA
    #define pfn_to_nid early_pfn_to_nid
    +#define pfn_to_nid(pfn) (0)

    #define early_pfn_valid(pfn) pfn_valid(pfn)
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      Last update: 2005-11-22 19:10    [W:0.019 / U:13.420 seconds]
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