s/head/held
Signed-off-by: NLi Zefan <lizf@cn.fujitsu.com>
Cc: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <4A7BD37E.9060806@cn.fujitsu.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>