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authorWen Congyang <wency@cn.fujitsu.com>2013-02-22 16:33:27 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-23 17:50:13 -0800
commit90b30cdc1d87450e2ae89c8f8a29102dc2c1992e (patch)
treeb613d6e644d7f0605f5a471c133f356da6ff5ea4
parentc4c605246452d0e578945ea95a8e72877e97e8c6 (diff)
memory-hotplug: export the function try_offline_node()
try_offline_node() will be needed in the tristate drivers/acpi/processor_driver.c. The node will be offlined when all memory/cpu on the node have been hotremoved. So we need the function try_offline_node() in cpu-hotplug path. If the memory-hotplug is disabled, and cpu-hotplug is enabled 1. no memory no the node we don't online the node, and cpu's node is the nearest node. 2. the node contains some memory the node has been onlined, and cpu's node is still needed to migrate the sleep task on the cpu to the same node. So we do nothing in try_offline_node() in this case. [rientjes@google.com: export the function try_offline_node() fix] Signed-off-by: Wen Congyang <wency@cn.fujitsu.com> Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com> Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> Cc: David Rientjes <rientjes@google.com> Cc: Jiang Liu <liuj97@gmail.com> Cc: Minchan Kim <minchan.kim@gmail.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Len Brown <lenb@kernel.org> Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/memory_hotplug.h3
-rw-r--r--mm/memory_hotplug.c3
2 files changed, 5 insertions, 1 deletions
diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index 69903ccf549e..b6a3be7d47bf 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -233,6 +233,7 @@ static inline void unlock_memory_hotplug(void) {}
#ifdef CONFIG_MEMORY_HOTREMOVE
extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
+extern void try_offline_node(int nid);
#else
static inline int is_mem_section_removable(unsigned long pfn,
@@ -240,6 +241,8 @@ static inline int is_mem_section_removable(unsigned long pfn,
{
return 0;
}
+
+static inline void try_offline_node(int nid) {}
#endif /* CONFIG_MEMORY_HOTREMOVE */
extern int mem_online_node(int nid);
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index e189b1f4a9db..17e1447077ab 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1706,7 +1706,7 @@ static int check_cpu_on_node(void *data)
}
/* offline the node if all memory sections of this node are removed */
-static void try_offline_node(int nid)
+void try_offline_node(int nid)
{
pg_data_t *pgdat = NODE_DATA(nid);
unsigned long start_pfn = pgdat->node_start_pfn;
@@ -1762,6 +1762,7 @@ static void try_offline_node(int nid)
*/
memset(pgdat, 0, sizeof(*pgdat));
}
+EXPORT_SYMBOL(try_offline_node);
int __ref remove_memory(int nid, u64 start, u64 size)
{