memory unplug: ia64 interface

IA64 memory unplug interface.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 11 insertions, 1 deletions

diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
index a096b30734f3..947ec0c73234 100644
--- a/arch/ia64/mm/init.c
+++ b/arch/ia64/mm/init.c
@@ -721,7 +721,17 @@ int arch_add_memory(int nid, u64 start, u64 size)
 
 int remove_memory(u64 start, u64 size)
 {
-        return -EINVAL;
+        unsigned long start_pfn, end_pfn;
+        unsigned long timeout = 120 * HZ;
+        int ret;
+        start_pfn = start >> PAGE_SHIFT;
+        end_pfn = start_pfn + (size >> PAGE_SHIFT);
+        ret = offline_pages(start_pfn, end_pfn, timeout);
+        if (ret)
+                goto out;
+        /* we can free mem_map at this point */
+out:
+        return ret;
 }
 EXPORT_SYMBOL_GPL(remove_memory);
 #endif