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    Subject[PATCH 04/11] memblock: Make find_memory_core_early() find from top-down
    Date
    That is used for find ram in node or bootmem type.

    We should make it top-down so it will be consistent to memblock_find.

    Suggested-by: Jeremy Fitzhardinge <jeremy@goop.org>
    Signed-off-by: Yinghai Lu <yinghai@kernel.org>
    ---
    mm/page_alloc.c | 34 +++++++++++++++++++++++++++++++++-
    1 files changed, 33 insertions(+), 1 deletions(-)

    diff --git a/mm/page_alloc.c b/mm/page_alloc.c
    index a873e61..887ce3b 100644
    --- a/mm/page_alloc.c
    +++ b/mm/page_alloc.c
    @@ -3616,6 +3616,34 @@ static int __meminit next_active_region_index_in_nid(int index, int nid)
    return -1;
    }

    +/*
    + * Basic iterator support. Return the last range of PFNs for a node
    + * Note: nid == MAX_NUMNODES returns last region regardless of node
    + */
    +static int __meminit last_active_region_index_in_nid(int nid)
    +{
    + int i;
    +
    + for (i = nr_nodemap_entries - 1; i >= 0; i--)
    + if (nid == MAX_NUMNODES || early_node_map[i].nid == nid)
    + return i;
    +
    + return -1;
    +}
    +
    +/*
    + * Basic iterator support. Return the previous active range of PFNs for a node
    + * Note: nid == MAX_NUMNODES returns next region regardless of node
    + */
    +static int __meminit previous_active_region_index_in_nid(int index, int nid)
    +{
    + for (index = index - 1; index >= 0; index--)
    + if (nid == MAX_NUMNODES || early_node_map[index].nid == nid)
    + return index;
    +
    + return -1;
    +}
    +
    #ifndef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
    /*
    * Required by SPARSEMEM. Given a PFN, return what node the PFN is on.
    @@ -3667,6 +3695,10 @@ bool __meminit early_pfn_in_nid(unsigned long pfn, int node)
    for (i = first_active_region_index_in_nid(nid); i != -1; \
    i = next_active_region_index_in_nid(i, nid))

    +#define for_each_active_range_index_in_nid_reverse(i, nid) \
    + for (i = last_active_region_index_in_nid(nid); i != -1; \
    + i = previous_active_region_index_in_nid(i, nid))
    +
    /**
    * free_bootmem_with_active_regions - Call free_bootmem_node for each active range
    * @nid: The node to free memory on. If MAX_NUMNODES, all nodes are freed.
    @@ -3705,7 +3737,7 @@ u64 __init find_memory_core_early(int nid, u64 size, u64 align,
    int i;

    /* Need to go over early_node_map to find out good range for node */
    - for_each_active_range_index_in_nid(i, nid) {
    + for_each_active_range_index_in_nid_reverse(i, nid) {
    u64 addr;
    u64 ei_start, ei_last;
    u64 final_start, final_end;
    --
    1.7.1


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