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    Subject[PATCH v2 3/5] mm/memblock: introduce memblock_search_pfn_regions()
    Date
    This api is the preparation for further optimizing early_pfn_valid

    Signed-off-by: Jia He <jia.he@hxt-semitech.com>
    ---
    include/linux/memblock.h | 2 ++
    mm/memblock.c | 9 +++++++++
    2 files changed, 11 insertions(+)

    diff --git a/include/linux/memblock.h b/include/linux/memblock.h
    index a8fb2ab..104bca6 100644
    --- a/include/linux/memblock.h
    +++ b/include/linux/memblock.h
    @@ -207,6 +207,8 @@ void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn,
    unsigned long memblock_next_valid_pfn(unsigned long pfn, int *idx);
    #endif

    +int memblock_search_pfn_regions(unsigned long pfn);
    +
    /**
    * for_each_free_mem_range - iterate through free memblock areas
    * @i: u64 used as loop variable
    diff --git a/mm/memblock.c b/mm/memblock.c
    index 06c1a08..15fcde2 100644
    --- a/mm/memblock.c
    +++ b/mm/memblock.c
    @@ -1661,6 +1661,15 @@ static int __init_memblock memblock_search(struct memblock_type *type, phys_addr
    return -1;
    }

    +/* search memblock with the input pfn, return the region idx */
    +int __init_memblock memblock_search_pfn_regions(unsigned long pfn)
    +{
    + struct memblock_type *type = &memblock.memory;
    + int mid = memblock_search(type, PFN_PHYS(pfn));
    +
    + return mid;
    +}
    +
    bool __init memblock_is_reserved(phys_addr_t addr)
    {
    return memblock_search(&memblock.reserved, addr) != -1;
    --
    2.7.4
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