RE: [PATCH urgent v2] sched: Add missing rcu protection to wake_up_all_idle_cpus

[Liu, Chuansheng]

> -----Original Message-----
> From: Andy Lutomirski [mailto:luto@xxxxxxxxxxxxxx]
> Sent: Sunday, November 30, 2014 12:14 AM
> To: Ingo Molnar; Thomas Gleixner; linux-kernel@xxxxxxxxxxxxxxx
> Cc: Peter Zijlstra; Andy Lutomirski; Liu, Chuansheng
> Subject: [PATCH urgent v2] sched: Add missing rcu protection to
> wake_up_all_idle_cpus
> 
> Locklessly doing is_idle_task(rq->curr) is only okay because of RCU
> protection.  The older variant of the broken code checked
> rq->curr == rq->idle instead and therefore didn't need RCU.
> 
> Fixes: f6be8af1c95d sched: Add new API wake_up_if_idle() to wake up the idle
> cpu
> Cc: Chuansheng Liu <chuansheng.liu@xxxxxxxxx>
> Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
> ---
Reviewed-by: Chuansheng Liu <chuansheng.liu@xxxxxxxxx>

Thanks Andy.

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