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authorAkinobu Mita <akinobu.mita@gmail.com>2012-07-31 01:43:02 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2012-07-31 04:25:22 +0400
commit8d438288145f19f253a82ca71290b44fce79e23f (patch)
tree521c1086079ed8fb78aa622cf19bdbcfd53cbe12 /lib/Kconfig.debug
parent1d151c337d79fa3de88654d2514f58fbd916a8e0 (diff)
downloadlinux-8d438288145f19f253a82ca71290b44fce79e23f.tar.xz
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 <akinobu.mita@gmail.com> Cc: Pavel Machek <pavel@ucw.cz> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Cc: Greg KH <greg@kroah.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Michael Ellerman <michael@ellerman.id.au> Cc: Dave Jones <davej@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/Kconfig.debug')
-rw-r--r--lib/Kconfig.debug11
1 files changed, 11 insertions, 0 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 4a186508bf8b..bdee91d50a5b 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1084,6 +1084,17 @@ config LKDTM
Documentation on how to use the module can be found in
Documentation/fault-injection/provoke-crashes.txt
+config NOTIFIER_ERROR_INJECTION
+ tristate "Notifier error injection"
+ depends on DEBUG_KERNEL
+ select DEBUG_FS
+ help
+ This option 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.
+
+ Say N if unsure.
+
config CPU_NOTIFIER_ERROR_INJECT
tristate "CPU notifier error injection module"
depends on HOTPLUG_CPU && DEBUG_KERNEL