[PATCH] SMP support for drain local pages.

[Nigel Cunningham <ncunningham@linuxmail.org>]

	From: Nigel Cunningham <ncunningham@linuxmail.org>

Hi.

This patch adds SMP support for drain_local_pages, so that suspend
implementations can drain pcp structures on all CPUs and thus accurately
determine which pages are free.

Please apply.

diff -ruN 2.6.6-current-bk/mm/page_alloc.c smp-drain-local-pages/mm/page_alloc.c
--- 2.6.6-current-bk/mm/page_alloc.c    2004-05-26 19:47:15.000000000 +1000
+++ smp-drain-local-pages/mm/page_alloc.c       2004-05-26 19:56:19.000000000 +1000
@@ -459,6 +459,24 @@
         __drain_pages(smp_processor_id());
         local_irq_restore(flags);
  }
+
+#ifdef CONFIG_SMP
+static void __smp_drain_local_pages(void * data)
+{
+       drain_local_pages();
+}
+
+void smp_drain_local_pages(void)
+{
+       smp_call_function(__smp_drain_local_pages, NULL, 0, 1);
+       drain_local_pages();
+}
+#else
+void smp_drain_local_pages(void)
+{
+       drain_local_pages();
+}
+#endif
  #endif /* CONFIG_PM */

  static void zone_statistics(struct zonelist *zonelist, struct zone *z)