mem-hotplug: introduce {un}lock_memory_hotplug()
Presently hwpoison is using lock_system_sleep() to prevent a race with
memory hotplug. However lock_system_sleep() is a no-op if
CONFIG_HIBERNATION=n. Therefore we need a new lock.
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Suggested-by: Hugh Dickins <hughd@google.com>
Acked-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 1243241..46ab2c0 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -51,6 +51,7 @@
#include <linux/slab.h>
#include <linux/swapops.h>
#include <linux/hugetlb.h>
+#include <linux/memory_hotplug.h>
#include "internal.h"
int sysctl_memory_failure_early_kill __read_mostly = 0;
@@ -1230,11 +1231,10 @@
return 1;
/*
- * The lock_system_sleep prevents a race with memory hotplug,
- * because the isolation assumes there's only a single user.
+ * The lock_memory_hotplug prevents a race with memory hotplug.
* This is a big hammer, a better would be nicer.
*/
- lock_system_sleep();
+ lock_memory_hotplug();
/*
* Isolate the page, so that it doesn't get reallocated if it
@@ -1264,7 +1264,7 @@
ret = 1;
}
unset_migratetype_isolate(p);
- unlock_system_sleep();
+ unlock_memory_hotplug();
return ret;
}