Re: Patch "kprobes: Use synchronize_rcu_tasks() for optprobe with CONFIG_PREEMPT=y" has been added to the 4.14-stable tree

[Greg KH <gregkh@linuxfoundation.org>]

On Thu, Dec 07, 2017 at 08:34:56AM +0900, Masami Hiramatsu wrote:
> On Wed, 06 Dec 2017 18:25:55 +0100
> <gregkh@linuxfoundation.org> wrote:
> 
> > 
> > This is a note to let you know that I've just added the patch titled
> > 
> >     kprobes: Use synchronize_rcu_tasks() for optprobe with CONFIG_PREEMPT=y
> > 
> > to the 4.14-stable tree which can be found at:
> >     http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
> > 
> > The filename of the patch is:
> >      kprobes-use-synchronize_rcu_tasks-for-optprobe-with-config_preempt-y.patch
> > and it can be found in the queue-4.14 subdirectory.
> > 
> > If you, or anyone else, feels it should not be added to the stable tree,
> > please let <stable@vger.kernel.org> know about it.
> 
> this depends on
> commit 7e42776d5ed1f ("rcu: Drive TASKS_RCU directly off of PREEMPT")

That patch is already in 4.14, so all should be fine there.

> So, pull above commit too, for 4.14 and 4.9. But I'm not sure TASKS_RCU is
> introduced on 3.18.

I've dropped this from 3.18 for now, and I'll go drop it from 4.9 as I
don't think it's really worth it at this point in time.

thanks for the review and quick response.

greg k-h