memory: memory notifier error injection module

[karo-tx-linux.git] / lib / memory-notifier-error-inject.c

diff --git a/lib/memory-notifier-error-inject.c b/lib/memory-notifier-error-inject.c
new file mode 100644 (file)
index 0000000..e6239bf
--- /dev/null
+++ b/lib/memory-notifier-error-inject.c
@@ -0,0 +1,48 @@
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/memory.h>
+
+#include "notifier-error-inject.h"
+
+static int priority;
+module_param(priority, int, 0);
+MODULE_PARM_DESC(priority, "specify memory notifier priority");
+
+static struct notifier_err_inject memory_notifier_err_inject = {
+       .actions = {
+               { NOTIFIER_ERR_INJECT_ACTION(MEM_GOING_ONLINE) },
+               { NOTIFIER_ERR_INJECT_ACTION(MEM_GOING_OFFLINE) },
+               {}
+       }
+};
+
+static struct dentry *dir;
+
+static int err_inject_init(void)
+{
+       int err;
+
+       dir = notifier_err_inject_init("memory", notifier_err_inject_dir,
+                                       &memory_notifier_err_inject, priority);
+       if (IS_ERR(dir))
+               return PTR_ERR(dir);
+
+       err = register_memory_notifier(&memory_notifier_err_inject.nb);
+       if (err)
+               debugfs_remove_recursive(dir);
+
+       return err;
+}
+
+static void err_inject_exit(void)
+{
+       unregister_memory_notifier(&memory_notifier_err_inject.nb);
+       debugfs_remove_recursive(dir);
+}
+
+module_init(err_inject_init);
+module_exit(err_inject_exit);
+
+MODULE_DESCRIPTION("memory notifier error injection module");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>");