kasan: disable memory hotplug

[linux-2.6-block.git] / mm / kasan / kasan.c

diff --git a/mm/kasan/kasan.c b/mm/kasan/kasan.c
index 6dc1aa7cefcc927bb1e28761f3c20cc2173652cd..def81104772f0f198b8a84e4d2c0ad699c1c2099 100644 (file)
--- a/mm/kasan/kasan.c
+++ b/mm/kasan/kasan.c
@@ -20,6 +20,7 @@
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/memblock.h>
+#include <linux/memory.h>
 #include <linux/mm.h>
 #include <linux/printk.h>
 #include <linux/sched.h>
@@ -300,3 +301,23 @@ EXPORT_SYMBOL(__asan_storeN_noabort);
 /* to shut up compiler complaints */
 void __asan_handle_no_return(void) {}
 EXPORT_SYMBOL(__asan_handle_no_return);
+
+#ifdef CONFIG_MEMORY_HOTPLUG
+static int kasan_mem_notifier(struct notifier_block *nb,
+                       unsigned long action, void *data)
+{
+       return (action == MEM_GOING_ONLINE) ? NOTIFY_BAD : NOTIFY_OK;
+}
+
+static int __init kasan_memhotplug_init(void)
+{
+       pr_err("WARNING: KASan doesn't support memory hot-add\n");
+       pr_err("Memory hot-add will be disabled\n");
+
+       hotplug_memory_notifier(kasan_mem_notifier, 0);
+
+       return 0;
+}
+
+module_init(kasan_memhotplug_init);
+#endif