1. 30 Jul, 2012 1 commit
    • Akinobu Mita's avatar
      cpu: rewrite cpu-notifier-error-inject module · f5a9f52e
      Akinobu Mita authored
      Rewrite existing cpu-notifier-error-inject module to use debugfs based new
      This change removes cpu_up_prepare_error and cpu_down_prepare_error module
      parameters which were used to specify error code to be injected.  We could
      keep these module parameters for backward compatibility by module_param_cb
      but it seems overkill for this module.
      This provides the ability to inject artifical errors to CPU notifier chain
      callbacks.  It is controlled through debugfs interface under
      If the notifier call chain should be failed with some events notified,
      write the error code to "actions/<notifier event>/error".
      Example1: 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
      Example2: inject CPU online error (-2 == -ENOENT)
      	# cd /sys/kernel/debug/notifier-error-inject/cpu
      	# echo -2 > actions/CPU_UP_PREPARE/error
      	# echo 1 > /sys/devices/system/cpu/cpu1/online
      	bash: echo: write error: No such file or directory
      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>
  2. 27 May, 2010 1 commit