path: root/lib/notifier-error-inject.h
diff options
authorAkinobu Mita <>2012-07-30 14:43:02 -0700
committerLinus Torvalds <>2012-07-30 17:25:22 -0700
commit8d438288145f19f253a82ca71290b44fce79e23f (patch)
tree521c1086079ed8fb78aa622cf19bdbcfd53cbe12 /lib/notifier-error-inject.h
parent1d151c337d79fa3de88654d2514f58fbd916a8e0 (diff)
fault-injection: notifier error injection
This patchset provides kernel modules that can be used to test the error handling of notifier call chain failures by injecting artifical errors to the following notifier chain callbacks. * CPU notifier * PM notifier * memory hotplug notifier * powerpc pSeries reconfig notifier Example: Inject CPU offline error (-1 == -EPERM) # cd /sys/kernel/debug/notifier-error-inject/cpu # echo -1 > actions/CPU_DOWN_PREPARE/error # echo 0 > /sys/devices/system/cpu/cpu1/online bash: echo: write error: Operation not permitted The patchset also adds cpu and memory hotplug tests to tools/testing/selftests These tests first do simple online and offline test and then do fault injection tests if notifier error injection module is available. This patch: The notifier error injection provides the ability to inject artifical errors to specified notifier chain callbacks. It is useful to test the error handling of notifier call chain failures. This adds common basic functions to define which type of events can be fail and to initialize the debugfs interface to control what error code should be returned and which event should be failed. Signed-off-by: Akinobu Mita <> Cc: Pavel Machek <> Cc: "Rafael J. Wysocki" <> Cc: Greg KH <> Cc: Benjamin Herrenschmidt <> Cc: Paul Mackerras <> Cc: Michael Ellerman <> Cc: Dave Jones <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
Diffstat (limited to 'lib/notifier-error-inject.h')
1 files changed, 24 insertions, 0 deletions
diff --git a/lib/notifier-error-inject.h b/lib/notifier-error-inject.h
new file mode 100644
index 000000000000..99b3b6fc470b
--- /dev/null
+++ b/lib/notifier-error-inject.h
@@ -0,0 +1,24 @@
+#include <linux/atomic.h>
+#include <linux/debugfs.h>
+#include <linux/notifier.h>
+struct notifier_err_inject_action {
+ unsigned long val;
+ int error;
+ const char *name;
+ .name = #action, .val = (action),
+struct notifier_err_inject {
+ struct notifier_block nb;
+ struct notifier_err_inject_action actions[];
+ /* The last slot must be terminated with zero sentinel */
+extern struct dentry *notifier_err_inject_dir;
+extern struct dentry *notifier_err_inject_init(const char *name,
+ struct dentry *parent, struct notifier_err_inject *err_inject,
+ int priority);