Re: [PATCH] sched: Do not bug in __sched_setscheduler() when pi is not used

[Greg KH]

On Mon, Nov 19, 2018 at 10:46:54AM -0500, Steven Rostedt wrote:
> On Mon, 19 Nov 2018 16:13:11 +0100
> Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> wrote:
> 
> > > Can this patch also be applied to the stable trees? The offending commit
> > > was first introduced in 4.2.  
> > 
> > What is the git commit id of this patch in Linus's tree?
> 
> 896bbb2522587e3b8eb2a0d204d43ccc1042a00d
> 
> The subject was changed when it was applied.

Ah, that helps.

But why is this really needed in the older kernels?  You want to crash
your machine if someone got things wrong?  Given that I doubt this is
being hit anymore, why is it needed in 4.9.y and 4.4.y?

Also, it doesn't apply there so someone needs to do the backport...

thanks,

greg k-h