linux-kernel - Re: [PATCH] sched: Do not bug in __sched

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Date:   Mon, 19 Nov 2018 14:27:56 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Laurent Dufour <ldufour@...ux.vnet.ibm.com>,
        Andrew Morton <akpm@...l.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] sched: Do not bug in __sched_setscheduler() when pi is
 not used

On Mon, 19 Nov 2018 11:09:50 -0800
Florian Fainelli <f.fainelli@...il.com> wrote:


> > I did the change against v4.2.8 below.  
> 
> Thanks Steven! Here is the local 4.9 backport:

Yours even updates the comment.

Reviewed-by: Steven Rostedt (VMware) <rostedt@...dmis.org>

-- Steve

> 
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index 917be221438b..6b3fff6a6437 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -4087,8 +4087,8 @@ static int __sched_setscheduler(struct task_struct *p,
>         int queue_flags = DEQUEUE_SAVE | DEQUEUE_MOVE;
>         struct rq *rq;
> 
> -       /* may grab non-irq protected spin_locks */
> -       BUG_ON(in_interrupt());
> +       /* The pi code expects interrupts enabled */
> +       BUG_ON(pi && in_interrupt());
>  recheck:
>         /* double check policy once rq lock held */