mm: make zone_pcp_reset independent of MEMORY_HOTREMOVE

340175b7 (mm/hotplug: free zone->pageset when a zone becomes empty)
introduced zone_pcp_reset and hided it inside CONFIG_MEMORY_HOTREMOVE.
Since "memory-hotplug: allocate zone's pcp before onlining pages" the
function is also called from online_pages which is defined outside
CONFIG_MEMORY_HOTREMOVE which causes a linkage error.

The function, although not used outside of MEMORY_{HOTPLUT,HOTREMOVE},
seems like universal enough so let's keep it at its current location
and only remove the HOTREMOVE guard.

Signed-off-by: Michal Hocko <mhocko@suse.cz>
Reviewed-by: Wen Congyang <wency@cn.fujitsu.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 4f736c01faa75c4d93fcf3a33d08d6ca0f6ce99f..45c916b197c8317a4b7f967004c4555e1ad7c37c 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5981,7 +5981,6 @@ void __meminit zone_pcp_update(struct zone *zone)
 }
 #endif
 
-#ifdef CONFIG_MEMORY_HOTREMOVE
 void zone_pcp_reset(struct zone *zone)
 {
        unsigned long flags;
@@ -6001,6 +6000,7 @@ void zone_pcp_reset(struct zone *zone)
        local_irq_restore(flags);
 }
 
+#ifdef CONFIG_MEMORY_HOTREMOVE
 /*
  * All pages in the range must be isolated before calling this.
  */