Re: [Xen-devel] Patch "x86/irq: Probe for PIC presence before allocating descs for legacy IRQs" has been added to the 4.3-stable tree

[Greg KH <gregkh@linuxfoundation.org>]

On Mon, Dec 07, 2015 at 02:17:30PM +0100, Sander Eikelenboom wrote:
> 
> Monday, December 7, 2015, 1:54:35 PM, you wrote:
> 
> > <gregkh@linuxfoundation.org> writes:
> 
> >> This is a note to let you know that I've just added the patch titled
> >>
> >>     x86/irq: Probe for PIC presence before allocating descs for legacy IRQs
> >>
> >> to the 4.3-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:
> >>      x86-irq-probe-for-pic-presence-before-allocating-descs-for-legacy-irqs.patch
> >> and it can be found in the queue-4.3 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 commit is known for breaking Xen PV guests, the breakage is fixed
> > with the following:
> 
> > commit b4ff8389ed14b849354b59ce9b360bdefcdbf99c
> > Author: Boris Ostrovsky <boris.ostrovsky@oracle.com>
> > Date:   Fri Nov 20 11:25:04 2015 -0500
> 
> >     xen/events: Always allocate legacy interrupts on PV guests
> 
> > I suggest we include this commit as well. Same for 4.2-stable tree.
> 
> Which in turn causes the problem described in:
> "Xen-devel] [PATCHv1] x86: rtc_cmos platform device requires legacy irqs"
> http://lkml.iu.edu/hypermail/linux/kernel/1512.0/02430.html
> 
> for which a patch is still pending a discussion about the right way to fix it.

When a patch to resolve it gets into Linus's tree, please tell
stable@vger.kernel.org about it.

thanks,

greg k-h