1 files changed, 110 insertions, 0 deletions
diff --git a/drivers/edac/edac_stub.c b/drivers/edac/edac_stub.c
new file mode 100644
index 000000000..9d9e18aef
--- /dev/null
+++ b/drivers/edac/edac_stub.c
@@ -0,0 +1,110 @@
+/*
+ * common EDAC components that must be in kernel
+ *
+ * Author: Dave Jiang <djiang@mvista.com>
+ *
+ * 2007 (c) MontaVista Software, Inc.
+ * 2010 (c) Advanced Micro Devices Inc.
+ *	    Borislav Petkov <bp@alien8.de>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ *
+ */
+#include <linux/module.h>
+#include <linux/edac.h>
+#include <linux/atomic.h>
+#include <linux/device.h>
+#include <asm/edac.h>
+
+int edac_op_state = EDAC_OPSTATE_INVAL;
+EXPORT_SYMBOL_GPL(edac_op_state);
+
+atomic_t edac_handlers = ATOMIC_INIT(0);
+EXPORT_SYMBOL_GPL(edac_handlers);
+
+int edac_err_assert = 0;
+EXPORT_SYMBOL_GPL(edac_err_assert);
+
+static atomic_t edac_subsys_valid = ATOMIC_INIT(0);
+
+int edac_report_status = EDAC_REPORTING_ENABLED;
+EXPORT_SYMBOL_GPL(edac_report_status);
+
+static int __init edac_report_setup(char *str)
+{
+	if (!str)
+		return -EINVAL;
+
+	if (!strncmp(str, "on", 2))
+		set_edac_report_status(EDAC_REPORTING_ENABLED);
+	else if (!strncmp(str, "off", 3))
+		set_edac_report_status(EDAC_REPORTING_DISABLED);
+	else if (!strncmp(str, "force", 5))
+		set_edac_report_status(EDAC_REPORTING_FORCE);
+
+	return 0;
+}
+__setup("edac_report=", edac_report_setup);
+
+/*
+ * called to determine if there is an EDAC driver interested in
+ * knowing an event (such as NMI) occurred
+ */
+int edac_handler_set(void)
+{
+	if (edac_op_state == EDAC_OPSTATE_POLL)
+		return 0;
+
+	return atomic_read(&edac_handlers);
+}
+EXPORT_SYMBOL_GPL(edac_handler_set);
+
+/*
+ * handler for NMI type of interrupts to assert error
+ */
+void edac_atomic_assert_error(void)
+{
+	edac_err_assert++;
+}
+EXPORT_SYMBOL_GPL(edac_atomic_assert_error);
+
+/*
+ * sysfs object: /sys/devices/system/edac
+ *	need to export to other files
+ */
+struct bus_type edac_subsys = {
+	.name = "edac",
+	.dev_name = "edac",
+};
+EXPORT_SYMBOL_GPL(edac_subsys);
+
+/* return pointer to the 'edac' node in sysfs */
+struct bus_type *edac_get_sysfs_subsys(void)
+{
+	int err = 0;
+
+	if (atomic_read(&edac_subsys_valid))
+		goto out;
+
+	/* create the /sys/devices/system/edac directory */
+	err = subsys_system_register(&edac_subsys, NULL);
+	if (err) {
+		printk(KERN_ERR "Error registering toplevel EDAC sysfs dir\n");
+		return NULL;
+	}
+
+out:
+	atomic_inc(&edac_subsys_valid);
+	return &edac_subsys;
+}
+EXPORT_SYMBOL_GPL(edac_get_sysfs_subsys);
+
+void edac_put_sysfs_subsys(void)
+{
+	/* last user unregisters it */
+	if (atomic_dec_and_test(&edac_subsys_valid))
+		bus_unregister(&edac_subsys);
+}
+EXPORT_SYMBOL_GPL(edac_put_sysfs_subsys);