linux-kernel - Re: [PATCH 1/1] X86/Hyper-V:: Fix the circular dependency in IPI enlightenment.

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Date:   Fri, 6 Jul 2018 12:00:08 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     KY Srinivasan <kys@...rosoft.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
        "olaf@...fle.de" <olaf@...fle.de>,
        "apw@...onical.com" <apw@...onical.com>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        "hpa@...or.com" <hpa@...or.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "Michael Kelley (EOSG)" <Michael.H.Kelley@...rosoft.com>,
        "vkuznets@...hat.com" <vkuznets@...hat.com>
Subject: Re: [PATCH 1/1] X86/Hyper-V:: Fix the circular dependency in IPI
 enlightenment.


* Thomas Gleixner <tglx@...utronix.de> wrote:

> On Fri, 6 Jul 2018, Ingo Molnar wrote:
> > * KY Srinivasan <kys@...rosoft.com> wrote:
> > > I am confused. The label ipi_mask_done was introduced in this patch
> > > (the patch under question fixes a circular dependency in this patch):
> > > 
> > > commit 68bb7bfb7985df2bd15c2dc975cb68b7a901488a
> > > Author: K. Y. Srinivasan <kys@...rosoft.com>
> > > Date:   Wed May 16 14:53:31 2018 -0700
> > > 
> > >     X86/Hyper-V: Enable IPI enlightenments
> > > 
> > >     Hyper-V supports hypercalls to implement IPI; use them.
> > > 
> > >     Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
> > >     Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> > >     Reviewed-by: Michael Kelley <mikelley@...rosoft.com>
> > > 
> > > This patch was committed by Thomas some weeks ago and is in linux-next.
> > > This patch is also in 4.18-rc3.
> > 
> > And then that name was changed to a different label in:
> > 
> >   4bd06060762b: x86/hyper-v: Use cheaper HVCALL_SEND_IPI hypercall when possible
> > 
> > So maybe you were testing on an older kernel. Could you try the latest -tip?
> 
> The problem is that the wreckage is in Linus tree and needs to be fixed
> there, i.e. via x86/urgent.

Indeed, I missed that!

> 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.

Ok!

Thanks,

	Ingo