Linux kernel source tree https://git.amat.us/linux/atom/lib/cpu-notifier-error-inject.c?h=v3.0.82 2010-05-27T16:12:48Z 2010-05-27T16:12:48Z Akinobu Mita akinobu.mita@gmail.com 2010-05-26T21:43:36Z urn:sha1:c9d221f86e43d9fb16260fe18a8cd6767f36c8a5 I used this module to test the series of modification to the cpu notifiers code. Example1: inject CPU offline error (-1 == -EPERM) # modprobe cpu-notifier-error-inject cpu_down_prepare_error=-1 # echo 0 > /sys/devices/system/cpu/cpu1/online bash: echo: write error: Operation not permitted Example2: inject CPU online error (-2 == -ENOENT) # modprobe cpu-notifier-error-inject cpu_up_prepare_error=-2 # echo 1 > /sys/devices/system/cpu/cpu1/online bash: echo: write error: No such file or directory [akpm@linux-foundation.org: fix Kconfig help text] Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>