From: Rusty Russell <rusty@rustcorp.com.au>
Date: Mon, 28 Jul 2008 17:16:29 +0000 (-0500)
Subject: Hotplug CPU: don't check cpu_online after take_cpu_down
X-Git-Tag: v2.6.27-rc1~30^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=04321587584272f4e8b9818f319f40caf8eeee13;p=pandora-kernel.git

Hotplug CPU: don't check cpu_online after take_cpu_down

Akinobu points out that if take_cpu_down() succeeds, the cpu must be offline.
Remove the cpu_online() check, and put a BUG_ON().

Quoting Akinobu Mita:
   Actually the cpu_online() check was necessary before appling this
   stop_machine: simplify patch.

   With old __stop_machine_run(), __stop_machine_run() could succeed
   (return !IS_ERR(p) value) even if take_cpu_down() returned non-zero value.
   The return value of take_cpu_down() was obtained through kthread_stop()..

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: "Akinobu Mita" <akinobu.mita@gmail.com>
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