linux-kernel - module param for CPU_NOTIFIER_ERROR

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Message-ID: <4E5153D8.7010607@gmail.com>
Date:	Sun, 21 Aug 2011 11:52:08 -0700
From:	"Justin P. Mattock" <justinmattock@...il.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	akinobu.mita@...il.com
Subject: module param for CPU_NOTIFIER_ERROR_INJECT

hello,
I am playing around with CPU_NOTIFIER_ERROR_INJECT and am noticing that

example 2
# 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

is not working for me, or atleast is not showing me any info that it is 
working.

the other proceedure does work:

example 1
# 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

dmesg shows:
[ 2427.924405] Injecting error (-1) at cpu notifier
[ 2427.930569] _cpu_down: attempt to take down CPU 1 failed


any ideas on what I need to do or is this working, and am I not seeing 
anything in dmesg?

Justin P. Mattock
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