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From:   "Michael Kelley (EOSG)" <Michael.H.Kelley@microsoft.com>
To:     Thomas Gleixner <tglx@linutronix.de>,
        KY Srinivasan <kys@microsoft.com>
CC:     Ingo Molnar <mingo@kernel.org>, "x86@kernel.org" <x86@kernel.org>,
        "gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
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        "olaf@aepfle.de" <olaf@aepfle.de>,
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        "hpa@zytor.com" <hpa@zytor.com>,
        Stephen Hemminger <sthemmin@microsoft.com>,
        "vkuznets@redhat.com" <vkuznets@redhat.com>
Subject: RE: [PATCH 1/1] X86/Hyper-V:: Fix the circular dependency in IPI
 enlightenment.
Thread-Topic: [PATCH 1/1] X86/Hyper-V:: Fix the circular dependency in IPI
 enlightenment.
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Date:   Fri, 6 Jul 2018 16:12:16 +0000
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> -----Original Message-----
> From: Thomas Gleixner <tglx@linutronix.de>
> Sent: Friday, July 6, 2018 3:42 AM
> To: KY Srinivasan <kys@microsoft.com>
> Cc: Ingo Molnar <mingo@kernel.org>; x86@kernel.org; gregkh@linuxfoundatio=
n.org; linux-
> kernel@vger.kernel.org; devel@linuxdriverproject.org; olaf@aepfle.de; apw=
@canonical.com;
> jasowang@redhat.com; hpa@zytor.com; Stephen Hemminger <sthemmin@microsoft=
.com>;
> Michael Kelley (EOSG) <Michael.H.Kelley@microsoft.com>; vkuznets@redhat.c=
om
> Subject: RE: [PATCH 1/1] X86/Hyper-V:: Fix the circular dependency in IPI=
 enlightenment.
>=20
> On Fri, 6 Jul 2018, Thomas Gleixner wrote:
> > On Fri, 6 Jul 2018, KY Srinivasan wrote:
> > > >
> > > > The problem is that the wreckage is in Linus tree and needs to be f=
ixed
> > > > there, i.e. via x86/urgent.
> > > >
> > > > Now we have the new bits queued in x86/hyperv already which collide=
. So
> > > > we
> > > > need to merge x86/urgent into x86/hyperv after applying the fix and=
 mop up
> > > > the merge wreckage in x86/hyperv.
> > > >
> > > > I'll have a look tomorrow morning unless you beat me to it.
> > >
> > > I can rebase this patch against the latest tip and resend (tomorrow).
> >
> > That doesn't help as we need to push the original fix to Linus ...
>=20
> Applied it to x86/urgent and fixed up the '-1' sloppy hack as pointed out
> by Vitaly and merged x86/urgent into x86/hyperv.
>=20
> Please check both branches for correctness.

Changes look good to me.  Some pre-existing signed/unsigned type sloppiness=
 is
still there in that hv_cpu_number_to_vp_number() should be 'u32' instead
of 'int', along with related local variables, but that's probably best to f=
ix in
linux-next on top of Vitaly's other changes.  This code will work.

Michael

>=20
> Thanks,
>=20
> 	tglx