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mm/memory_hotplug.c: improve comments
Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com> Cc: Jiang Liu <jiang.liu@huawei.com> Cc: Lai Jiangshan <laijs@cn.fujitsu.com> Cc: Wen Congyang <wency@cn.fujitsu.com> Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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1 changed files with 12 additions and 6 deletions
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@ -590,18 +590,21 @@ static int online_pages_range(unsigned long start_pfn, unsigned long nr_pages,
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}
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#ifdef CONFIG_MOVABLE_NODE
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/* when CONFIG_MOVABLE_NODE, we allow online node don't have normal memory */
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/*
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* When CONFIG_MOVABLE_NODE, we permit onlining of a node which doesn't have
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* normal memory.
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*/
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static bool can_online_high_movable(struct zone *zone)
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{
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return true;
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}
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#else /* #ifdef CONFIG_MOVABLE_NODE */
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#else /* CONFIG_MOVABLE_NODE */
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/* ensure every online node has NORMAL memory */
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static bool can_online_high_movable(struct zone *zone)
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{
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return node_state(zone_to_nid(zone), N_NORMAL_MEMORY);
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}
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#endif /* #ifdef CONFIG_MOVABLE_NODE */
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#endif /* CONFIG_MOVABLE_NODE */
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/* check which state of node_states will be changed when online memory */
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static void node_states_check_changes_online(unsigned long nr_pages,
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@ -1112,12 +1115,15 @@ check_pages_isolated(unsigned long start_pfn, unsigned long end_pfn)
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}
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#ifdef CONFIG_MOVABLE_NODE
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/* when CONFIG_MOVABLE_NODE, we allow online node don't have normal memory */
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/*
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* When CONFIG_MOVABLE_NODE, we permit offlining of a node which doesn't have
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* normal memory.
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*/
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static bool can_offline_normal(struct zone *zone, unsigned long nr_pages)
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{
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return true;
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}
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#else /* #ifdef CONFIG_MOVABLE_NODE */
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#else /* CONFIG_MOVABLE_NODE */
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/* ensure the node has NORMAL memory if it is still online */
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static bool can_offline_normal(struct zone *zone, unsigned long nr_pages)
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{
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@ -1141,7 +1147,7 @@ static bool can_offline_normal(struct zone *zone, unsigned long nr_pages)
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*/
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return present_pages == 0;
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}
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#endif /* #ifdef CONFIG_MOVABLE_NODE */
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#endif /* CONFIG_MOVABLE_NODE */
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/* check which state of node_states will be changed when offline memory */
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static void node_states_check_changes_offline(unsigned long nr_pages,
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