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    Subject[PATCH v2 06/12] memory-hotplug: unregister memory section on SPARSEMEM_VMEMMAP
    Date
    From: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>

    Currently __remove_section for SPARSEMEM_VMEMMAP does nothing. But even if
    we use SPARSEMEM_VMEMMAP, we can unregister the memory_section.

    So the patch add unregister_memory_section() into __remove_section().

    CC: David Rientjes <rientjes@google.com>
    CC: Jiang Liu <liuj97@gmail.com>
    CC: Len Brown <len.brown@intel.com>
    CC: Christoph Lameter <cl@linux.com>
    Cc: Minchan Kim <minchan.kim@gmail.com>
    CC: Andrew Morton <akpm@linux-foundation.org>
    CC: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
    CC: Wen Congyang <wency@cn.fujitsu.com>
    Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
    ---
    mm/memory_hotplug.c | 13 ++++++++-----
    1 files changed, 8 insertions(+), 5 deletions(-)

    diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
    index ca07433..66a79a7 100644
    --- a/mm/memory_hotplug.c
    +++ b/mm/memory_hotplug.c
    @@ -286,11 +286,14 @@ static int __meminit __add_section(int nid, struct zone *zone,
    #ifdef CONFIG_SPARSEMEM_VMEMMAP
    static int __remove_section(struct zone *zone, struct mem_section *ms)
    {
    - /*
    - * XXX: Freeing memmap with vmemmap is not implement yet.
    - * This should be removed later.
    - */
    - return -EBUSY;
    + int ret = -EINVAL;
    +
    + if (!valid_section(ms))
    + return ret;
    +
    + ret = unregister_memory_section(ms);
    +
    + return ret;
    }
    #else
    static int __remove_section(struct zone *zone, struct mem_section *ms)
    --
    1.7.1


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