[PATCH] RCU - cpu offline fix

[PATCH] RCU - cpu offline fix

This fixes the RCU cpu offline code which was broken by singly-linked RCU
changes.  Nathan pointed out the problems and submitted a patch for this.
This is an optimal fix - no need to iterate through the list of callbacks,
just use the tail pointers and attach the list from the dead cpu.

Signed-off-by: Nathan Lynch <nathanl@austin.ibm.com>
Signed-off-by: Dipankar Sarma <dipankar@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>