• Yasuaki Ishimatsu's avatar
    memory-hotplug: implement register_page_bootmem_info_section of sparse-vmemmap · 46723bfa
    Yasuaki Ishimatsu authored
    For removing memmap region of sparse-vmemmap which is allocated bootmem,
    memmap region of sparse-vmemmap needs to be registered by
    get_page_bootmem().  So the patch searches pages of virtual mapping and
    registers the pages by get_page_bootmem().
    
    NOTE: register_page_bootmem_memmap() is not implemented for ia64,
          ppc, s390, and sparc.  So introduce CONFIG_HAVE_BOOTMEM_INFO_NODE
          and revert register_page_bootmem_info_node() when platform doesn't
          support it.
    
          It's implemented by adding a new Kconfig option named
          CONFIG_HAVE_BOOTMEM_INFO_NODE, which will be automatically selected
          by memory-hotplug feature fully supported archs(currently only on
          x86_64).
    
          Since we have 2 config options called MEMORY_HOTPLUG and
          MEMORY_HOTREMOVE used for memory hot-add and hot-remove separately,
          and codes in function register_page_bootmem_info_node() are only
          used for collecting infomation for hot-remove, so reside it under
          MEMORY_HOTREMOVE.
    
          Besides page_isolation.c selected by MEMORY_ISOLATION under
          MEMORY_HOTPLUG is also such case, move it too.
    
    [mhocko@suse.cz: put register_page_bootmem_memmap inside CONFIG_MEMORY_HOTPLUG_SPARSE]
    [linfeng@cn.fujitsu.com: introduce CONFIG_HAVE_BOOTMEM_INFO_NODE and revert register_page_bootmem_info_node()]
    [mhocko@suse.cz: remove the arch specific functions without any implementation]
    [linfeng@cn.fujitsu.com: mm/Kconfig: move auto selects from MEMORY_HOTPLUG to MEMORY_HOTREMOVE as needed]
    [rientjes@google.com: fix defined but not used warning]
    Signed-off-by: default avatarWen Congyang <wency@cn.fujitsu.com>
    Signed-off-by: default avatarYasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
    Signed-off-by: default avatarTang Chen <tangchen@cn.fujitsu.com>
    Reviewed-by: default avatarWu Jianguo <wujianguo@huawei.com>
    Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
    Cc: Jiang Liu <jiang.liu@huawei.com>
    Cc: Jianguo Wu <wujianguo@huawei.com>
    Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
    Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
    Cc: Ingo Molnar <mingo@elte.hu>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: "H. Peter Anvin" <hpa@zytor.com>
    Signed-off-by: default avatarMichal Hocko <mhocko@suse.cz>
    Signed-off-by: default avatarLin Feng <linfeng@cn.fujitsu.com>
    Signed-off-by: default avatarDavid Rientjes <rientjes@google.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    46723bfa
Kconfig 15.9 KB