1. 30 Jul, 2012 1 commit
    • Akinobu Mita's avatar
      fault-injection: notifier error injection · 8d438288
      Akinobu Mita authored
      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: default avatarAkinobu 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: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>