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    Subject[PATCH 33/49] memblock: Add memblock_find_in_range()
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    it is a wrapper for memblock_find_base

    make it more easy for x86 to use memblock. ( rebase )
    x86 early_res is using find/reserve pattern instead of alloc.

    keep it in weak version, so later We can use x86 own version if needed.
    also We need it in mm/memblock.c, so one caller mm/page_alloc.c could get compiled

    -v2: Change name to memblock_find_in_range() according to Michael Ellerman
    -v3: Add generic weak version __memblock_find_in_range()
    so keep the path for fallback to x86 version that handle from low
    -v4: use 0 for failing path
    -v5: use MEMBLOCK_ERROR again
    -v6: remove __memblock_find_in_range()

    Signed-off-by: Yinghai Lu <yinghai@kernel.org>
    ---
    include/linux/memblock.h | 2 ++
    mm/memblock.c | 8 ++++++++
    2 files changed, 10 insertions(+), 0 deletions(-)

    diff --git a/include/linux/memblock.h b/include/linux/memblock.h
    index 9f544cd..7162b2f 100644
    --- a/include/linux/memblock.h
    +++ b/include/linux/memblock.h
    @@ -48,6 +48,8 @@ extern struct memblock_region memblock_reserved_init_regions[];
    #define memblock_dbg(fmt, ...) \
    if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)

    +u64 memblock_find_in_range(u64 start, u64 end, u64 size, u64 align);
    +
    extern void __init memblock_init(void);
    extern void __init memblock_analyze(void);
    extern long memblock_add(phys_addr_t base, phys_addr_t size);
    diff --git a/mm/memblock.c b/mm/memblock.c
    index 81eaf90..58b646f 100644
    --- a/mm/memblock.c
    +++ b/mm/memblock.c
    @@ -156,6 +156,14 @@ static phys_addr_t __init memblock_find_base(phys_addr_t size, phys_addr_t align
    return MEMBLOCK_ERROR;
    }

    +/*
    + * Find a free area with specified alignment in a specific range.
    + */
    +u64 __init __weak memblock_find_in_range(u64 start, u64 end, u64 size, u64 align)
    +{
    + return memblock_find_base(size, align, start, end);
    +}
    +
    static void __init_memblock memblock_remove_region(struct memblock_type *type, unsigned long r)
    {
    unsigned long i;
    --
    1.6.4.2


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